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Federica VERDINI

Pubblicazioni

Federica VERDINI

 

66 pubblicazioni classificate nel seguente modo:

Nr. doc. Classificazioni
29 4 Contributo in Atti di Convegno (Proceeding)
18 1 Contributo su Rivista
11 5 Altro
8 2 Contributo in Volume
Anno Risorsa
A Simple sEMG-Based Measure of Muscular Recruitment Variability During Pediatric Walking
Proceedings of the 2019 IEEE International Symposium on Medical Measurements & Applications (MeMeA)
Autore/i: Spinsante, Susanna; DI NARDO, Francesco; Strazza, Annachiara; Verdini, Federica; Poli, Angelica
Editore: IEEE I&M Society
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/265005 Collegamento a IRIS

2019 An interactive tool for the analysis of muscular recruitment during walking task
COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING: IMAGING & VISUALIZATION
Autore/i: Mengarelli, Alessandro; Cardarelli, Stefano; DI NARDO, Francesco; Burattini, Laura; Verdini, Federica; Fioretti, Sandro
Classificazione: 1 Contributo su Rivista
Abstract: The present work proposes an interactive software tool for surface electromyography signal processing and analysis, focused on the assessment of muscular activations during walking and easy-to-use also for users without signal treatment knowledge. The tool is based on two logical steps: first, an automatic detection of muscle activations is provided; then, the user can tune the value of each processing parameter, with a real-time visual feedback. A stride-to-stride evaluation of muscular recruitment and a co-contraction recognition are available, together with the computation of an average myoelectric activation pattern. The tunable signal processing tailors the analysis to any considered application, allowing to extract information from low-quality signals. A muscle activity characterisation from the single stride to the whole walking trial is also provided. Beyond gait analysis and muscles activation timing identification, this tool could be valuable also in an educational scenario, considering the interactive characteristics of the graphical user interface.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/260812 Collegamento a IRIS

2018 An instrumental approach for monitoring physical exercises in a visual markerless scenario: A proof of concept
JOURNAL OF BIOMECHANICS
Autore/i: Capecci, Marianna; Ceravolo, Maria Gabriella; Ferracuti, Francesco; Grugnetti, Martina; Iarlori, Sabrina; Longhi, Sauro; Romeo, Luca; Verdini, Federica
Classificazione: 1 Contributo su Rivista
Abstract: This work proposes a real-time monitoring tool aimed to support clinicians for remote assessing exercise performances during home-based rehabilitation. The study relies on clinician indications to define kinematic features, that describe five motor tasks (i.e., the lateral tilt of the trunk, lifting of the arms, trunk rotation, pelvis rotation, squatting) usually adopted in the rehabilitation program for axial disorders. These features are extracted by the Kinect v2 skeleton tracking system and elaborated to return disaggregated scores, representing a measure of subjects performance. A bell-shaped function is used to rank the patient performances and to provide the scores. The proposed rehabilitation tool has been tested on 28 healthy subjects and on 29 patients suffering from different neurological and orthopedic diseases. The reliability of the study has been performed through a cross-sectional controlled design methodology, comparing algorithm scores with respect to blinded judgment provided by clinicians through filling a specific questionnaire. The use of task-specific features and the comparison between the clinical evaluation and the score provided by the instrumental approach constitute the novelty of the study. The proposed methodology is reliable for measuring subject's performance and able to discriminate between the pathological and healthy condition.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/253076 Collegamento a IRIS

2018 A time-frequency approach for the assessment of dynamic muscle co-contractions
IFMBE Proceedings
Autore/i: Strazza, A.; Verdini, F.; Mengarelli, A.; Cardarelli, S.; Burattini, L.; Fioretti, S.; Di Nardo, F.
Editore: Springer Verlag
Classificazione: 2 Contributo in Volume
Abstract: Co-contraction is defined as the activity of agonist and antagonist muscles around a joint, enhancing stability and balance. The quantitative assessment of muscle co-contractions would be meaningful for deepening the comprehension of this physiological mechanism. Thus, the purpose of this work is to quantify muscle co-contraction using energy localization in time-frequency domain of sEMG signal during straight walking. To this purpose, sEMG from tibialis anterior (TA) and gastrocnemius lateralis (GL) and basographic signals were acquired in five healthy subjects during walking. Basographic signals were analyzed to quantify foot-floor contact. sEMG signals were processed using Wavelet Transform (WT) to identify muscular co-contractions, according to the following steps. Daubechies (order 4 with 6 levels of decomposition) was chosen as mother wavelet. A denoising algorithm based on Daubechies mother wavelet was applied for removing noise from raw signals. Denoised signals were decomposed into WT coefficients with different frequency content, and then recombined to achieve the co-scalogram function, a localized statistical assessment of cross-energy density between signals. The localization of regions with maximum cross-energy density provided the assessment of co-contractions in time-frequency domain. This methodology applied to TA and GL signals was able to detect GL/TA co-contractions during mid-stance (30–34% of GC) phase, matching with literature. Moreover, WT approach was able to provide also the frequency band of information content for muscle co-contractions: 65–164 Hz. In conclusion, this study proposed WT cross-energy density as a reliable estimation of muscle co-contraction in time-frequency domain.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/260829 Collegamento a IRIS

2018 Are extensor digitorum brevis and gastrocnemius working together? Surface EMG analysis in healthy children
IFMBE Proceedings
Autore/i: Di Nardo, F.; Strazza, A.; Mengarelli, A.; Cardarelli, S.; Burattini, L.; Verdini, F.; Fioretti, S.
Editore: Springer Verlag
Classificazione: 2 Contributo in Volume
Abstract: A relationship between intrinsic and extrinsic foot muscles is acknowledged during walking. Literature on foot-muscle recruitment in children is not very extensive. Purpose of the study was the surface-EMG-based evaluation of possible concomitant recruitment of intrinsic and extrinsic foot muscles during healthy-children walking. Gastrocnemius lateralis (GL) was analyzed as representative for extrinsic foot muscles (ankle plantar flexor). Extensor digitorum brevis (EDB) is one of the main intrinsic foot muscles, controlling foot movement and stability. In this study, EDB was considered as representative of foot muscles. Surface-EMG signals during 4-min walking trial were acquired in eight healthy school-age children (mean ± SD: age 8.3 ± 1.7 years; height 136 ± 8 cm; mass 30.9 ± 6.2 kg) to fulfill the goal of the study. Then, Statistical gait analysis, a recent methodology performing a statistical characterization of gait, was applied to process EMG data. An exceptional number of strides were analyzed to consider the expected variability (mean ± SD = 265 ± 30 strides for each child, nearly 2500 in total). The research was undertaken in compliance with ethical principles of Helsinki Declaration and approved by institutional expert committee. Results showed that EDB activity is localized in two separate regions of gait cycle: mid-stance (from 8.2 ± 7.0 to 50.3 ± 15.0% of gait cycle) and swing phase, from 73.8 ± 13.8 to 95.1 ± 4.7%. Main GL activity occurred in the same regions: mid-stance (from 5.7 ± 2.5 to 49.7 ± 4.6% of gait cycle) and swing phase, from 69.2 ± 18.7 to 95.4 ± 5.4%. These findings showed that regions of activity of EDB and GL were practically overlapped, suggesting that EDB and GL worked synergistically for foot and ankle-joint control in children walking, in a large percentage of strides. Present study produced novel data on the variability of the reciprocal role of EDB and GL during children walking, providing a deeper insight in mechanisms regulating ankle-foot stability.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/260833 Collegamento a IRIS

2018 Gait asymmetry in winters group I hemiplegic children: Role of tibialis anterior
IFMBE Proceedings
Autore/i: Di Nardo, F; Mengarelli, A.; Strazza, A.; Verdini, F.; Cardarelli, S.; Burattini, L.; Fioretti, S.
Editore: Springer Verlag
Classificazione: 2 Contributo in Volume
Abstract: Hemiplegia is a neurological disorder that occurs quite often in children, affecting up to one child in one thousand. Typically, only one side of the body is affected by hemiplegia, while the other side is maintaining an apparently normal behavior. Purpose of present analysis was assessing gait asymmetry in group I (W1) hemiplegic children according to Winters classification, where W1 is characterized by presence of drop foot in swing in the hemiplegic side. Asymmetry was quantified by differences between hemiplegic and non-hemiplegic side in terms of foot-floor contact and electromyographic (EMG) activity. Surface EMG from tibialis anterior (TA) and foot-floor contact data were acquired in ten hemiplegic W1 children during walking to fulfill this aim. An exceptional number of strides was analyzed to consider the data variability, expected in W1 (mean ± SD = 287 ± 62 strides for each child, more than 3000 in total). Statistical gait analysis, a recent methodology performing a statistical characterization of gait, was applied to process EMG data. The research was undertaken in compliance with ethical principles of Helsinki Declaration and approved by institutional expert committee. Results showed that asymmetries were detected in basographic data: W1 children showed a significant decrease (p < 0.05) of strides with normal foot-floor contact (HFPS sequence: heel contact, flat-foot contact, push-off, swing) in hemiplegic side with respect to non-hemiplegic side. Also, TA recruitment presented asymmetries during walking, characterized by a curtailed, less frequent activity (p < 0.05) during terminal swing and a lack of activity at heel strike in hemiplegic side, with respect to non-hemiplegic side. In conclusion, present study suggested that walking in W1 children is characterized by asymmetries in both foot-floor contact patterns and TA recruitment.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/260831 Collegamento a IRIS

2018 Validity of the Nintendo Wii Balance Board for the Assessment of Balance Measures in the Functional Reach Test
IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING
Autore/i: Mengarelli, Alessandro; Cardarelli, Stefano; Strazza, Annachiara; Di Nardo, Francesco; Fioretti, Sandro; Verdini, Federica
Classificazione: 1 Contributo su Rivista
Abstract: The functional reach test (FRT) is widely used for assessing dynamic balance stability in elderly and pathological subjects. Force platforms (FPs) represent a fundamental part of the instrumented FRT experimental setup due to the central role of center-of-pressure (COP) displacement in FRT analysis. Recently, the nintendo wii balance board (NBB) has been suggested as a low-cost and reliable device for ground reaction force and COP measurement in poorly dynamic motor tasks. Therefore, this paper aimed to compare NBB-COP data with those obtained from a laboratory-grade platform during FRT. Data from 48 healthy subjects were simultaneously acquired from both devices. FP-COP and NBB-COP trajectories showed a remarkable correlation in both directions (r>0.990) and low root-mean-square error values (1.14 ± 0.88 mm and 0.55 ± 0.28 mm for anterior-posterior and medial-lateral direction). Fixed biases between COP-based parameters did not exceed 2% of the FP outcomes with high consistency throughout the present measurement range (ICC consistency always >0.950). Only the COP mean velocity exhibited a tendency toward proportional errors, which can be adjusted by a calibration of NBB data. Findings of this paper confirmed the NBB validity for COP measurement in a widely used motor task as the functional reach, supporting the feasibility of NBB in research scenarios.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/259193 Collegamento a IRIS

2018 Position estimation of an IMU placed on Pelvis through meta-heuristically optimised WFLC
IFMBE Proceedings
Autore/i: Cardarelli, Stefano; Verdini, Federica; Mengarelli, Alessandro; Strazza, Annachiara; DI NARDO, Francesco; Burattini, Laura; Fioretti, Sandro
Editore: Springer Verlag
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/260811 Collegamento a IRIS

2018 Role of the visual feedback on balance responses to upright stance perturbations
IFMBE Proceedings
Autore/i: Mengarelli, Alessandro; Cardarelli, Stefano; Fioretti, Sandro; Strazza, Annachiara; Andrea, Tigrini; DI NARDO, Francesco; Burattini, Laura; Verdini, Federica
Editore: Springer Verlag
Classificazione: 2 Contributo in Volume
Abstract: In this study an evaluation of visual feedback on the balance response to upright stance perturbations is proposed. Subjects underwent to base of support translations in backward direction at fixed velocity in an eye-open (EO) and eye-closed (EC) condition. Center of pressure (COP) and center of mass (COM) were acquired, showing a repeatable double-peak shape which mirrors two different response periods: a destabilizing phase and a counterbalancing phase. Thus, COP and COM were analyzed on the basis of their temporal and spatial features. Further, also the angular displacement of lower limb joints, trunk and head were considered and lower limb muscular activity in terms of myoelectric latencies. Results showed several differences in COP and COM based parameters between EO and EC condition. Moreover, angular range variations seemed to indicate a different role of each joint in the two considered sensory conditions, highlighting the switch from an ankle-based strategy (EO condition) to a more complex kinematic strategy (EC condition). Outcomes of this study could add information about: (A) the suitability of considering COP displacement in perturbed posture analyses with sensory deprivation and (B) the significant role of the visual feedback in balance maintenance when a sudden and quasi-impulsive disruption is employed.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/260809 Collegamento a IRIS

2018 Balance assessment during squatting exercise: A comparison between laboratory grade force plate and a commercial, low-cost device
JOURNAL OF BIOMECHANICS
Autore/i: Mengarelli, Alessandro; Verdini, Federica; Cardarelli, Stefano; Di Nardo, Francesco; Burattini, Laura; Fioretti, Sandro
Classificazione: 1 Contributo su Rivista
Abstract: Testing balance through squatting exercise is a central part of many rehabilitation programs and sports and plays also an important role in clinical evaluation of residual motor ability. The assessment of center of pressure (CoP) displacement and its parametrization is commonly used to describe and analyze squat movement and the laboratory-grade force plates (FP) are the gold standard for measuring balance performances from a dynamic view-point. However, the Nintendo Wii Balance Board (NWBB) has been recently proposed as an inexpensive and easily available device for measuring ground reaction force and CoP displacement in standing balance tasks. Thus, this study aimed to compare the NWBB-CoP data with those obtained from a laboratory FP during a dynamic motor task, such as the squat task. CoP data of forty-eight subjects were acquired simultaneously from a NWBB and a FP and the analyses were performed over the descending squatting phase. Outcomes showed a very high correlation (r) and limited root-mean-square differences between CoP trajectories in anterior-posterior (r > 0.99, 1.63 ± 1.27 mm) and medial-lateral (r > 0.98, 1.01 ± 0.75 mm) direction. Spatial parameters computed from CoP displacement and ground reaction force peak presented fixed biases between NWBB and FP. Errors showed a high consistency (standard deviation < 2.4% of the FP outcomes) and a random spread distribution around the mean difference. Mean velocity is the only parameter which exhibited a tendency towards proportional values. Findings of this study suggested the NWBB as a valid device for the assessment and parametrization of CoP displacement during squatting movement.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/256928 Collegamento a IRIS

2018 A sliding mode control model for perturbed upright stance in healthy subjects
IFMBE Proceedings
Autore/i: Mengarelli, Alessandro; Fioretti, Sandro; Orlando, Giuseppe; Cardarelli, Stefano; Fioretti, Ismaele; Marco Paci, Gian; Burattini, Laura; DI NARDO, Francesco; Strazza, Annachiara; Verdini, Federica
Editore: Springer Verlag
Classificazione: 2 Contributo in Volume
Abstract: Human upright stance and balance maintenance in quiet conditions have been extensively evaluated throughout the years. However, relatively less information is available on how the central nervous system (CNS) acts to maintain balance after sudden perturbations of stance. Here, a sliding mode control (SMC) model for the characterization of balance maintenance after external perturbations is proposed. Human stance was modeled as an inverted pendulum (IP), which describes kinematics in the sagittal plane; the choice of a SMC allowed to avoid model linearization, commonly employed when using a single-link IP for bipedal stance modeling, thus providing a more accurate description of the human-stance system dynamics. Model was applied on experimental data obtained from perturbed stance trials consisting of a series of disruptions of the same magnitude. This experimental condition was able to elicit a well-known feature called “habituation rate”, which refers to the subject capacity to self-adapt his/her responses to identical perturbations. SMC parameters were identified through a robust optimization procedure. Results showed limited tracking errors for center of mass displacement. One of the SMC parameters exhibited a clear trend from the first to the last trial, appearing able to quantify the habituation rate effect. The application of such a control model to the non-quiet stance can provide additional information in understanding how the CNS tailors balance responses in different conditions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/260810 Collegamento a IRIS

2018 A Hidden Semi-Markov Model based Approach for Rehabilitation Exercise Assessment
JOURNAL OF BIOMEDICAL INFORMATICS
Autore/i: Capecci, Marianna; Ceravolo, Maria Gabriella; Ferracuti, Francesco; Iarlori, Sabrina; Kyrki, Ville; Monteriù, Andrea; Romeo, Luca; Verdini, Federica
Classificazione: 1 Contributo su Rivista
Abstract: In this paper, a Hidden Semi-Markov Model (HSMM) based approach is proposed to evaluate and monitor body motion during a rehabilitation training program. The approach extracts clinically relevant motion features from skeleton joint trajectories, acquired by the RGB-D camera, and provides a score for the subject's performance. The approach combines different aspects of rule and template based methods. The features have been defined by clinicians as exercise descriptors and are then assessed by a HSMM, trained upon an exemplar motion sequence. The reliability of the proposed approach is studied by evaluating its correlation with both a clinical assessment and a Dynamic Time Warping (DTW) algorithm, while healthy and neurological disabled people performed physical exercises. With respect to the discrimination between healthy and pathological conditions, the HSMM based method correlates better with the physician's score than DTW. The study supports the use of HSMMs to assess motor performance providing a quantitative feedback to physiotherapist and patients. This result is particularly appropriate and useful for a remote assessment in the home.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252467 Collegamento a IRIS

2018 Collaborative design of a telerehabilitation system enabling virtual second opinion based on fuzzy logic
IET COMPUTER VISION
Autore/i: Capecci, Marianna; Ciabattoni, L.; Ferracuti, Francesco; Monteriù, Andrea; Romeo, Luca; Verdini, Federica
Classificazione: 1 Contributo su Rivista
Abstract: In this paper we present a low cost telerehabilitation system made up of a commercial RGB-D camera and a web-based platform. Our goal is to monitor and assess subject movement providing acceptable and usable at-home remote rehabilitation ser- vices without the presence of a clinician. Clinical goals, defined by physiotherapists, are firstly translated into motion analysis features. A Takagi Sugeno Fuzzy Inference System (FIS) is then proposed to evaluate and combine these features into scores. In this stage the “collaborative design” paradigm is used in depth and complete manner: the contribution of the clinician is not limited only to the rules definition but enters in the core of the evaluation algorithm through the definition of the fuzzy rules. A case study on low back pain rehabilitation involving 40 subjects, 5 exercises and 4 physiotherapists is then presented to effectiveness of the proposed system. Results of the validation of the system aimed at the assessment of the reliability of the proposed approach show high correlations between clinician evaluation and FIS scores. In this scenario, due to the high correlation, each FIS could represent a virtual alter-ego of the physiotherapist which enable a real time and free second opinion.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252419 Collegamento a IRIS

2017 Acellular dermal matrix and heel reconstruction: a new prospective
JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
Autore/i: Scalise, Alessandro; Torresetti, Matteo; Verdini, Federica; Capecci, Marianna; Andrenelli, Elisa; Mengarelli, Alessandro; Ceravolo, Maria Gabriella; Fioretti, Sandro; Di Benedetto, Giovanni
Classificazione: 1 Contributo su Rivista
Abstract: Heel reconstruction represents a challenge for all plastic surgeons due to the anatomical and functional features of this weight-bearing area. In the last decade a combined use of acellular dermal matrices and skin grafts has been proposed as a reliable and less invasive alternative for complex wound management; nevertheless only a few cases have been reported in the literature.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/249780 Collegamento a IRIS

2017 Assessment of Patient Functional Performance in Different Knee Arthroplasty Designs during Unconstrained Squat
M.L.T.J. MUSCLES, LIGAMENTS AND TENDONS JOURNAL
Autore/i: Verdini, Federica; Zara, Claudio; Leo, Tommaso; Mengarelli, Alessandro; Cardarelli, Stefano; Bernardo, Innocenti
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/258806 Collegamento a IRIS

2017 Gait parameter and event estimation using smartphones
GAIT & POSTURE
Autore/i: Pepa, Lucia; Verdini, Federica; Spalazzi, Luca
Classificazione: 1 Contributo su Rivista
Abstract: Background and objectives: The use of smartphones can greatly help for gait parameters estimation during daily living, but its accuracy needs a deeper evaluation against a gold standard. The objective of the paper is a step-bystep assessment of smartphone performance in heel strike, step count, step period, and step length estimation. The influence of smartphone placement and orientation on estimation performance is evaluated as well. Methods: This work relies on a smartphone app developed to acquire, process, and store inertial sensor data and rotation matrices about device position. Smartphone alignment was evaluated by expressing the acceleration vector in three reference frames. Two smartphone placements were tested. Three methods for heel strike detection were considered. On the basis of estimated heel strikes, step count is performed, step period is obtained, and the inverted pendulum model is applied for step length estimation. Pearson correlation coefficient, absolute and relative errors, ANOVA, and Bland–Altman limits of agreement were used to compare smartphone estimation with stereophotogrammetry on eleven healthy subjects. Results: High correlations were found between smartphone and stereophotogrammetric measures: up to 0.93 for step count, to 0.99 for heel strike, 0.96 for step period, and 0.92 for step length. Error ranges are comparable to those in the literature. Smartphone placement did not affect the performance. The major influence of acceleration reference frames and heel strike detection method was found in step count. Conclusion: This study provides detailed information about expected accuracy when smartphone is used as a gait monitoring tool. The obtained results encourage real life applications.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255493 Collegamento a IRIS

2017 Real time indoor localization integrating a model based pedestrian dead reckoning on smartphone and BLE beacons
JOURNAL OF AMBIENT INTELLIGENCE AND HUMANIZED COMPUTING
Autore/i: Ciabattoni, Lucio; Foresi, Gabriele; Monteriu', Andrea; Pepa, Lucia; Pagnotta, Daniele Proietti; Spalazzi, Luca; Verdini, Federica
Classificazione: 1 Contributo su Rivista
Abstract: Mobile and pervasive computing enabled a new realm of possibilities into the indoor positioning domain. Although many candidate technologies have been proposed, no one can still adapt to every use case. A case centered design and the implementation of the solution within the specific domain is the current research trend. With the rise of Bluetooth Low Energy (BLE) Beacons, i.e., platforms used to interact digitally with the real world, more standard positioning solutions are emerging in different contexts. However the reachable positioning accuracy with this technology is still unacceptable for some real applications (e.g., in the healthcare sector or the emergency management). In this paper, an hybrid localization application coupling a real time model based Pedestrian Dead Reckoning (PDR) technique and the analysis of the Received Signal Strength Indicator (RSSI) of BLE beacons is proposed. In particular, the smartphone application is composed by three main real time threads: a model based step length estimation, heading determination and the fusion of beacon information to reset the position and the drift error of the PDR. In order to give soundness to our approach we firstly validated the step length smartphone app with a stereo-photogrammetric system. The whole proposed solution was then tested on fifteen healthy subjects.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250892 Collegamento a IRIS

2017 A QR-code localization system for mobile robots: Application to smart wheelchairs
European Conference on Mobile Robots (ECMR)
Autore/i: Cavanini, Luca; Cimini, Gionata; Ferracuti, Francesco; Freddi, Alessandro; Ippoliti, Gianluca; Monteriu, Andrea; Verdini, Federica
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A Smart Wheelchair (SW) is an electric powered wheelchair, equipped with sensors and computational capabilities, with the general aim of both enhancing independence and improving perceived quality of life of the impaired people using it. SWs belong to the class of semi-autonomous mobile robots, designed to carry the user from one location to another of his/her choice. For such systems, the localization aspect is of utmost concern, since GPS signal is not available indoors and alternative sensor sets are required. This paper proposes a low- cost artificial landmark-based localization system for mobile robots operating indoor. It is based on Quick Response (QR) codes, which contain the absolute position of the landmark: a vision system recognizes the codes, estimates the relative position of the robot (i.e., displacement and orientation) w.r.t. the codes and, finally, calculates the absolute position of the robot by exploiting the information contained in the codes. The system has been experimentally validated for self-localization of a smart wheelchair, and experimental results confirm that navigation is possible when considering an high QR-code density, while QR-code low density conditions permit to reset the cumulative odometry error.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252389 Collegamento a IRIS

2017 Real-time mental stress detection based on smartwatch
2017 IEEE International Conference on Consumer Electronics, ICCE 2017
Autore/i: Ciabattoni, Lucio; Ferracuti, Francesco; Longhi, Sauro; Pepa, Lucia; Romeo, Luca; Verdini, Federica
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/259872 Collegamento a IRIS

2017 Multimedia experience enhancement through affective computing
2017 IEEE International Conference on Consumer Electronics, ICCE 2017
Autore/i: Ciabattoni, Lucio; Ferracuti, Francesco; Longhi, Sauro; Pepa, Lucia; Romeo, Luca; Verdini, Federica
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/259871 Collegamento a IRIS

2017 Center of pressure based assessment of balance responses to repeated perturbations of upright stance
IFMBE Proceedings
Autore/i: Mengarelli, A.; Cardarelli, S.; Fioretti, S.; Burattini, L.; Di Nardo, F.; Verdini, F.
Editore: Springer Verlag
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this study a description of balance response to sudden external perturbations of the upright posture was performed. To this aim, subjects underwent to a series of translational perturbations at fixed speed in backward and forward direction. Center of pressure (CoP) displacement was analyzed in terms of temporal and spatial characteristics, showing a repeatable waveform which allowed the identification of two main response periods: the destabilizing and the counterbalancing phase. Different control features of balance response have been observed in both phases, with a temporal-based control of CoP displacement in the first phase and an amplitude-based control in the second one. Moreover, the analysis of CoP could be useful to identify the presence of the first trial effect and the habituation rate, two well-known features of perturbed posturography. These findings could contribute to the understanding of balance control in perturbed conditions and suggest CoP as a valuable measure in studying not only the quiet but also the perturbed stance.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250214 Collegamento a IRIS

2017 Separation of superimposed electrocardiographic and electromyographic signals
IFMBE Proceedings
Autore/i: Sbrollini, A.; Agostinelli, A.; Morettini, M.; Verdini, F.; Di Nardo, F.; Fioretti, S.; Burattini, L.
Editore: Springer Verlag
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Electrocardiography (ECG) and surface electromyography (SEMG) are two non-invasive tests to evaluate cardiac and muscular functionality, respectively. They are both acquired by placing electrodes on the body surface so they become one the interference of the other. Typically, linear filters are used for ECG and SEMG separation: high-pass filters with cutoff at 20 Hz to attenuate ECG interference in SEMG, and low-pass filters with cut-off at 50 Hz to attenuate SEMG interference in ECG. In spite of that, linear filtering is not adequate due to the presence of a 20-50 Hz frequency-band in which the two signal spectra overlap. The aim of the present study was to evaluate the ability of the Segmented-Beat Modulation Method (SBMM) for ECG and SEMG separation and by accurately maintaining signals characteristics. SBMM is a template-based technique for ECG denoising: under the hypothesis of ECG and SEMG linearly superimposed, it first provides an ECG estimation, and then an SEMG estimation by subtraction. In order to test the method under several conditions, SBMM was applied to simulated as well as clinical recordings with superimposed ECG and SEMG. SBMM was able to accurately estimate both ECG and SEMG in all cases. Indeed, ECG and SEMG were estimated by maintain their features such as amplitude (estimation errors <6%), heart rate and heart-rate variability. Moreover, estimated ECG was always characterized by a spectrum mostly (76.4-100.0%) included in the 0-50 Hz frequency-band, whereas estimated SEMG was always characterized by a spectrum mostly (80.9-95.6%) included in the 20-450 Hz frequency-band. Such results confirm the existence of a 20-50 Hz frequency-band in which ECG and SEMG spectral components are overlapped. Thus, SBMM is a robust filtering procedure to separate superimposed ECG and SEMG.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250221 Collegamento a IRIS

2017 Ankle muscles co-activation patterns during normal gait: An amplitude evaluation
IFMBE Proceedings
Autore/i: Cardarelli, S.; Gentili, A.; Mengarelli, A.; Verdini, F.; Fioretti, S.; Burattini, L.; Di Nardo, F
Editore: Springer Verlag
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The objective of this work was to quantify co-activations of ankle muscles during able-bodied walking, in terms of amplitude values of surface electromyographic signal (sEMG). Gastrocnemius lateralis (GL) was analyzed as representative muscles for plantar-flexion. Tibialis anterior (TA) was analyzed as representative muscles for dorsi-flexion. Rudolph’s dynamic co-activation index was computed on the sEMG acquired from 182 strides, with the aim of quantifying the ankle-muscles co-contraction amplitude. Four different co-activations between GL and TA were observed during Heel strike (HS), Foot contact (FC), Push-off (PO), and Swing (SW), respectively. No differences were detected in time-duration of co-contractions detected in the different phases (p<0.05). TA/GL co-contraction activity is more intense in stance phase (especially during HS and FC), where a more intensive muscular control is needed for weight-support and Center of pressure (COP) progression. Co-contractions in swing phase are more frequent but milder. SW co-contraction in adults was pointed out only recently; to our knowledge, the present work is the first that quantifies it in terms of absolute and comparative amplitude. PO seems to be a transitory phase between high-level (HS and FC) and low-level (SW) co-contraction intensity regions. Present findings could be useful for deepening the physiological interpretation of ankle muscles co-activity during walking.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250216 Collegamento a IRIS

2017 Time-frequency analysis of surface EMG signals for maximum energy localization during walking
IFMBE Proceedings
Autore/i: Strazza, A.; Verdini, F.; Burattini, L.; Fioretti, S.; Di Nardo, F
Editore: Springer Verlag
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The purpose of this work is to assess the maximum energy localization in time-frequency domain of the surface EMG signal of the main lower-limb muscles usually involved in able-bodied walking. The maximum energy localization in time-frequency domain has been identified by means of Continuous Wavelet Transform (CWT), a time-scale analysis method for multiresolution decomposition of continuous-time signals. WT coefficients allowed to reconstruct the scalogram function, providing an estimate of the local time-frequency energy density of a signal. Then, localization of maximum energy density has been identified as the interval in time-frequency where the scalogram is exceeding the 72% of the peak value of energy density in both time and frequency domain. Results showed that the localization of maximum signal energy in time coincided with the region of maximum muscle recruitment during walking. A common frequency band of maximum information content was identified for all muscles between 70 and 160 Hz. These findings could be suitable for both supporting the use of WT for sEMG analysis and providing clinical indications on muscle recruitment during walking.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250224 Collegamento a IRIS

2017 SIAMOC position paper on gait analysis in clinical practice: General requirements, methods and appropriateness. Results of an Italian consensus conference
GAIT & POSTURE
Autore/i: Benedetti, Maria Grazia; Beghi, Ettore; De Tanti, Antonio; Cappozzo, Aurelio; Basaglia, Nino; Cutti, Andrea Giovanni; Cereatti, Andrea; Stagni, Rita; Verdini, Federica; Manca, Mario; Fantozzi, Silvia; Mazzà, Claudia; Camomilla, Valentina; Campanini, Isabella; Castagna, Anna; Cavazzuti, Lorenzo; Del Maestro, Martina; Croce, Ugo Della; Gasperi, Marco; Leo, Tommaso; Marchi, Pia; Petrarca, Maurizio; Piccinini, Luigi; Rabuffetti, Marco; Ravaschio, Andrea; Sawacha, Zimi; Spolaor, Fabiola; Tesio, Luigi; Vannozzi, Giuseppe; Visintin, Isabella; Ferrarin, Maurizio
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266436 Collegamento a IRIS

2016 A MATLAB-based graphical user interface for the identification of muscular activations from surface electromyography signals
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
Autore/i: Mengarelli, Alessandro; Cardarelli, Stefano; Verdini, Federica; Burattini, Laura; Fioretti, Sandro; Di Nardo, Francesco
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this paper a graphical user interface (GUI) built in MATLAB® environment is presented. This interactive tool has been developed for the analysis of superficial electromyography (sEMG) signals and in particular for the assessment of the muscle activation time intervals. After the signal import, the tool performs a first analysis in a totally user independent way, providing a reliable computation of the muscular activation sequences. Furthermore, the user has the opportunity to modify each parameter of the on/off identification algorithm implemented in the presented tool. The presence of an user-friendly GUI allows the immediate evaluation of the effects that the modification of every single parameter has on the activation intervals recognition, through the real-time updating and visualization of the muscular activation/deactivation sequences. The possibility to accept the initial signal analysis or to modify the on/off identification with respect to each considered signal, with a real-time visual feedback, makes this GUI-based tool a valuable instrument in clinical, research applications and also in an educational perspective.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/245155 Collegamento a IRIS

2016 A smartphone-based architecture to detect and quantify freezing of gait in Parkinson’s disease
GAIT & POSTURE
Autore/i: Capecci, Marianna; Pepa, Lucia; Verdini, Federica; Ceravolo, Maria Gabriella
Classificazione: 1 Contributo su Rivista
Abstract: Introduction The freezing of gait (FOG) is a common and highly distressing motor symptom in patients with Parkinson’s Disease (PD). Effective management of FOG is difficult given its episodic nature, heterogeneous manifestation and limited responsiveness to drug treatment. Methods In order to verify the acceptance of a smartphone-based architecture and its reliability at detecting FOG in real-time, we studied 20 patients suffering from PD-related FOG. They were asked to perform video-recorded Timed Up and Go (TUG) test with and without dual-tasks while wearing the smartphone. Video and accelerometer recordings were synchronized in order to assess the reliability of the FOG detection system as compared to the judgement of the clinicians assessing the videos. The architecture uses two different algorithms, one applying the Freezing and Energy Index (Moore-Bächlin Algorithm), and the other adding information about step cadence, to algorithm 1. Results A total 98 FOG events were recognized by clinicians based on video recordings, while only 7 FOG events were missed by the application. Sensitivity and specificity were 70.1% and 84.1%, respectively, for the Moore-Bächlin Algorithm, rising to 87.57% and 94.97%, respectively, for algorithm 2 (McNemar value = 28.42; p = 0.0073). Conclusion Results confirm previous data on the reliability of Moore-Bächlin Algorithm, while indicating that the evolution of this architecture can identify FOG episodes with higher sensitivity and specificity. An acceptable, reliable and easy-to-implement FOG detection system can support a better quantification of the phenomenon and hence provide data useful to ascertain the efficacy of therapeutic approaches.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236891 Collegamento a IRIS

2016 A markerless system based on smartphones and webcam for the measure of step length, width and duration on treadmill
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
Autore/i: Barone, V.; Verdini, F.; Burattini, L.; Di Nardo, F.; Fioretti, S.
Classificazione: 1 Contributo su Rivista
Abstract: Background and objective: A markerless low cost prototype has been developed for the deter-mination of some spatio-temporal parameters of human gait: step-length, step-width andcadence have been considered. Only a smartphone and a high-definition webcam have beenused.Methods: The signals obtained by the accelerometer embedded in the smartphone are usedto recognize the heel strike events, while the feet positions are calculated through imageprocessing of the webcam stream. Step length and width are computed during gait trials ona treadmill at various speeds (3, 4 and 5 km/h).Results: Six subjects have been tested for a total of 504 steps. Results were compared withthose obtained by a stereo-photogrammetric system (Elite, BTS Engineering). The maximumaverage errors were 3.7 cm (5.36%) for the right step length and 1.63 cm (15.16%) for the rightstep width at 5 km/h. The maximum average error for step duration was 0.02 s (1.69%) at5 km/h for the right steps.Conclusion: The system is characterized by a very high level of automation that allows itsuse by non-expert users in non-structured environments. A low cost system able to auto-matically provide a reliable and repeatable evaluation of some gait events and parametersduring treadmill walking, is relevant also from a clinical point of view because it allows theanalysis of hundreds of steps and consequently an analysis of their variability.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/230084 Collegamento a IRIS

2016 Step length estimation for Freezing of Gait monitoring in parkinsonian patients
MOBILE NETWORKS FOR BIOMETRIC DATA ANALYSIS
Autore/i: Pepa, Lucia; Rossini, Marco; Spalazzi, Luca; Verdini, Federica
Editore: Springer Verlag
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247878 Collegamento a IRIS

2016 Accuracy evaluation of the Kinect v2 sensor during dynamic movements in a rehabilitation scenario
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
Autore/i: Capecci, Marianna; Ceravolo, Maria Gabriella; Ferracuti, Francesco; Iarlori, Sabrina; Longhi, Sauro; Romeo, Luca; Russi, S; Verdini, Federica
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/259866 Collegamento a IRIS

2016 Physical rehabilitation exercises assessment based on Hidden Semi-Markov Model by Kinect v2
3rd IEEE EMBS International Conference on Biomedical and Health Informatics, BHI 2016
Autore/i: Capecci, M.; Ceravolo, M.G.; Ferracuti, F.; Iarlori, S.; Kyrki, V.; Longhi, S.; Romeo, L.; Verdini, F.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This work investigates how Hidden Semi-Markov Model (HSMM) can be used to monitor and evaluate physical rehabilitation exercises by Kinect v2 to support medical personnel and patients during rehabilitation at home. Authors developed an exercises assessment method based on the extraction of motion features determined by clinicians. Five different rehabilitation exercises are modeled using a HSMM to provide an assessment score. The scores are compared with those obtained using the Dynamic Time Warping to discriminate which, between these two methods, best correlates doctors and physiotherapists' evaluation. Results show that HSMM can be used to evaluate exercise performances and give a feedback to physiotherapists and patients about exercise execution. © 2016 IEEE.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/237322 Collegamento a IRIS

2016 Real time step length estimation on smartphone
2016 IEEE International Conference on Consumer Electronics, ICCE 2016
Autore/i: Pepa, Lucia; Marangoni, Giacomo; Di Nicola, Matteo; Ciabattoni, Lucio; Verdini, Federica; Spalazzi, Luca; Longhi, Sauro
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Smartphones are particularly suitable for health related applications during daily living, given their diffusion into society and computational capabilities. We proposed a smartphone application for real-time step length estimation, using inverted pendulum model. We tested the proposed solution on 5 healthy subjects, comparing the smartphone estimation with a stereophotogrammetric system. © 2016 IEEE.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/237323 Collegamento a IRIS

2016 Webcam and smartphone for the measure of spatial-temporal parameters of gait for treadmill use
Lecture Notes in Electrical Engineering
Autore/i: Barone, Vinicio; Verdini, F.; Di Nardo, F.; Maranesi, E.; Burattini, L.; Fioretti, S.
Editore: Springer Verlag
Classificazione: 2 Contributo in Volume
Abstract: First author search in Pubmed(opens in a new window)|View at Publisher| Export | Download | Add to List | More... Lecture Notes in Electrical Engineering Volume 392, 2016, Pages 261-272 International Workshop on Mobile Networks for Biometric Data Analysis, 2014; Ancona; Italy; 30 October 2014 through 31 October 2014; Code 179299 Webcam and smartphone for the measure of spatial-temporal parameters of gait for treadmill use (Conference Paper) Barone, V. , Verdini, F., Di Nardo, F., Maranesi, E., Burattini, L., Fioretti, S. Università Politecnica delle Marche, Ancona, Italy View references (16) Abstract A very low cost prototype has been developed for the spatial and temporal analysis of human movement using an integrated system of last generation smartphones and a high-definition webcam, controlled by a laptop. The system can be used to analyse mainly planar motions in non-structured environments. In this paper, the accelerometer signal captured by the 3D sensor embedded in one smartphone, and the position of coloured markers extracted from the analysis of the webcam frames, are used for the computation of spatial-temporal parameters of gait. The system has been tested on a treadmill at different gait speeds. Accuracy of results is compared with that obtainable by a gold-standard stereometric instrumentation. The system is characterised by a very low cost and a very high level of automation. It has been thought to be used by non-expert users in ambulatory settings.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/240336 Collegamento a IRIS

2015 A 3D multibody approach to the study of human motion: jumps and gait analyses
Atti del XXII Congresso AIMETA - Associazione Italiana di Meccanica Teorica e Applicata
Autore/i: Palmieri, Giacomo; Callegari, Massimo; Fioretti, Sandro; Palpacelli, Matteo-Claudio; Verdini, Federica
Editore: De Ferrari Comunicazione
Luogo di pubblicazione: Genova
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Motion analysis of the human body can be supported by several experimental techniques developed in recent years. The use of three-dimensional stereophotogrammetric motion capture systems has become a fundamental technique for the kinematic analysis of complex motions. Such systems are usually combined with other instruments exploited for the dynamic measurements: ground reaction forces can be measured by single or multiaxial force platforms. Even if a great amount of experimental data can be obtained from experimental investigations it is sometimes difficult to establish cause-effect relationships in complex dynamic systems directly from measurements. Therefore, computer modeling and simulation, based on experimental data, can provide useful insights for human biomechanics. This work describes the analyses of two common gestures, jumps [1] and gait, which represent two test cases where the proposed methodology is applied. The motions have been executed in laboratory where a 3D motion capture system has been used to acquire the coordinates of a set of markers placed at anatomical landmarks, while a six-axis force plate has been used to measure the ground reaction forces. Simulations of the acquired motions have been developed by means of the multibody software OpenSim [2], an open-source platform for modeling, simulating, and analyzing the human body motion. After a 3D multibody model of the human body has been set up and scaled on the basis of the specific anthropometric characteristics, the kinematic and dynamic experimental data have been provided as input for the inverse kinematics and inverse dynamics analyses. Such operations, combined with a residual reduction algorithm which minimizes the error between the measured reaction forces and the reactions forces obtained form the inverse dynamics analysis, allows to perform a simulation of the human body motions with dynamically consistent kinematic data. Results of simulations can be processed in order to obtain the joint angles, moments and powers. Furthermore, a series of auxiliary data can be estimated, including the joint reactions and the motion of the center of gravity of the single limbs or of the whole body.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/228098 Collegamento a IRIS

2015 A tool for home-based rehabilitation allowing for clinical evaluation in a visual markerless scenario
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
Autore/i: Capecci, M.; Ceravolo, M.G.; D'Orazio, F.; Ferracuti, F.; Iarlori, S.; Lazzaro, G.; Longhi, S.; Romeo, L.; Verdini, F.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This work deals with the design of an interactive monitoring tool for home-based physical rehabilitation. The software platform includes a video processing stage and the exercise performance evaluation. Image features are extracted by a Kinect v2 sensor and elaborated to return the exercises score. Furthermore the tool provides to physiotherapists a quantitative exercise evaluation of subject's performances. The proposed tool for home rehabilitation has been tested on 5 subjects and 5 different exercises and results are presented. In particular both exercises and relative evaluation indexes were selected by specialists in neurorehabilitation.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234690 Collegamento a IRIS

2015 An architecture to manage motor disorders in Parkinson's disease
IEEE World Forum on Internet of Things, WF-IoT 2015 - Proceedings
Autore/i: Pepa, Lucia; Capecci, Marianna; Verdini, Federica; Ceravolo, Maria Gabriella; Spalazzi, Luca
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247874 Collegamento a IRIS

2015 Experimental evaluation of a smartphone based Step Length estimation
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
Autore/i: Pepa, Lucia; Verdini, Federica; Spalazzi, Luca
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247881 Collegamento a IRIS

2015 A System with Line Lasers and Webcam for 3D Reconstruction: A Feasibility Study
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS.
Autore/i: Barone, V; Verdini, F; Di Nardo, F; Burattini, L; Fioretti, S
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236154 Collegamento a IRIS

2015 Validation of an optimized algorithm to use Kinect in a non-structured environment for Sit-to-Stand analysis.
2015 Annual International Conference of the IEEE Engineering in Medicine and Biology Society.
Autore/i: Cippitelli, Enea; Gasparrini, Samuele; Spinsante, Susanna; Gambi, Ennio; Verdini, Federica; Burattini, Laura; Di Nardo, Francesco; Fioretti, Sandro
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The aim of this work is to obtain reliable kinematic measures relative to the execution of the Sit-to-Stand functional evaluation test, by low-cost and widely diffused instrumentation, that even non-experienced users can adopt in non-structured environments, like ambulatory or domestic settings. In particular, the paper refers to a low cost RGB-Depth sensor widely used in the gaming scenario like the Microsoft Kinect sensor. An algorithm is proposed that allows a reliable measure of human motion in a sagittal view. The performance of the proposed algorithm is compared to other two classic commercial algorithms. Results obtained by all the three algorithms have been compared to kinematic results obtained by the use of a stereophotogrammetric system that represents the gold-standard for kinematic measurement of human movement. Average errors of about 4 degrees, both for the trunk/leg angle and for the knee flexion/extension angle, have been obtained by the proposed algorithm and open the way to its possible adoption in non-clinical environments and further applications.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/230156 Collegamento a IRIS

2014 Can the Current Mobile Technology Help for Medical Assistance? The Case of Freezing of Gait in Parkinson Disease
Ambient Assisted Living
Autore/i: Lucia Pepa; Federica Verdini; Marianna Capecci; Maria Gabriella Ceravolo; Tommaso Leo
Editore: Springer International Publishing Switzerland
Classificazione: 2 Contributo in Volume
Abstract: Parkinson’s disease (PD) affects around 1.5 % people aged 65 years. Among PD features, freezing of gait (FOG) is frequent, involving 70 % PD people after 10 years of disease onset, and highly disabling. Effective management of FOG is a challenge for the limited responsiveness to both drug treatment and functional neurosurgery. As “cueing on demand” is the only strategy of proven efficacy on FOG, it would be crucial to develop a portable assistive device able to release suitable cues at every time the FOG occurs during the daily living (DL) of the patient, without interfering with his/her daily activities. The current smart mobile telephony devices are in principle apt to satisfy all the above mentioned requisites in terms of technological feasibility of ambulation monitoring devices and in terms of acceptability, because of their increasing widespread diffusion. In this paper we will outline a smart-phone based architecture able to detect FOG, to produce the proper cues, and to provide information for continuous monitoring of the events. The paper will specifically consider the clinical necessity, technical feasibility, economic sustainability of the solution proposed and its potential of application.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/163775 Collegamento a IRIS

2014 Smartphone Based Fuzzy Logic Freezing of Gait Detection in Parkinson’s Disease
Mechatronic and Embedded Systems and Applications (MESA), 2014
Autore/i: Pepa L.; Ciabattoni L.; Verdini F.; Capecci M.; Ceravolo M.G.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The freezing of gait (FOG) is a common and highly distressing motor symptom of patients with Parkinson’s Disease (PD). Effective management of FOG is difficult given its episodic nature, heterogeneous manifestation and limited responsiveness to drug treatment. Clinicians found alternative approaches, such as rhythmic cueing. We built a smartphone-based architecture in agreement with acceptability and usability requirements which is able to gather data and information useful to detect FOG. In this work fusing together the information of freeze index, energy, cadency variation and the ratio of the derivative of the energy a novel Fuzzy Logic based algorithm is developed. Performances of the Fuzzy algorithm are compared with two other algorithms showing its capability to reduce false negative detection thus improving sensitivity and specificity
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/214516 Collegamento a IRIS

2014 Predicting Freezing of Gait in Parkinson’s Disease with a smartphone: comparison between two algorithms
5th Italian Forum on Ambient Assisted Living (ForItAAL)
Autore/i: PEPA L; VERDINI F; CAPECCI M; MARACCI F; CERAVOLO MG; LEO T.
Editore: Springer Verlag
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The freezing of gait (FOG) is a common and highly distressing motor symptom of patients with Parkinson’s Disease (PD). Effective management of FOG is difficult given its episodic nature, heterogeneous manifestation and limited responsiveness to drug treatment. Clinicians found alternative approaches, such as rhythmic cueing. We have built a smartphone-based architecture in agreement with acceptability and usability requirements which is able to detect FOG and provide acoustic feedback to the patient. The aim of this work is to compare the reliability of a real-time FOG detection using two different algorithms implemented on the smartphone
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/214515 Collegamento a IRIS

2013 Integration of experimental techniques and multibody modeling for the human motion analysis
Atti del XXI Congresso AIMETA
Autore/i: G. Palmieri; M. Callegari; S. Fioretti; A. Gargamelli; T. Leo; F. Verdini
Editore: edizioni libreria cortina
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The aim of the work is to asses a novel methodology for the 3D analysis of the human motion: data obtained by 3D motion capture experimental techniques and dynamometric measurements obtained by force platforms are integrated with numerical data extrapolated from multibody simulations. The multibody model is developed with OpenSim, an open-source software which provides models of the human body or of single limbs defined by bodies (bones), joints (articulations), points (markers) and actuators (muscles); giving in input the coordinates of the markers obtained by motion capture it is possible to simulate the action and to extract several kinematic variables, such as joint angles and trajectory, velocity and acceleration of the center of gravity. The experimental and numerical data are used for the study of two typical test cases used to evaluate the muscular activity of lower limbs, which are the squat jump and the standing long jump. The combination of kinematic and dynamic data allows also energetic evaluations, useful for the validation of several simplified analytical models available from literature.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/115073 Collegamento a IRIS

2009 “Mild Neurological Signs” in subjects with knee osteoarthritis: Observational pilot study
Gait & Posture
Autore/i: Verdini F.; Capecci M. ; Collina M.E.; Riccardi G.R. ; Salvatore A. ; Leo T.; Ceravolo M.G.
Editore: Elsevier
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/65121 Collegamento a IRIS

2006 IDENTIFICATION AND CHARACTERISATION OF HEEL STRIKE TRANSIENT
GAIT & POSTURE
Autore/i: M.E. MARCUCCI; F.VERDINI; M.G. BENEDETTI; T. LEO
Classificazione: 1 Contributo su Rivista
Abstract: This study set out to ascertain the incidence of a heel strike transient (HST) and to verify whether modifications of muscle activation time could be correlated with the presence and the characteristic of a HST. Lower limb kinematics, kinetics and surface electromyography (SEMG) of normal subjects were examined during barefoot walking. A short-lived sharp HSTwas present in 76% of the trials while a smooth HST, of longer duration was seen in 13.3% of the trials. The transient phenomenon was absent in the remaining 10.7% of trials. The SEMG showed that alteration in the activation timing of muscles correlated with the presence of a HST.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/25362 Collegamento a IRIS

2005 Statistica indicator for the evaluation of human gait analysis by Ground Reaction Forces
Autore/i: Karch D.; Marcucci M; Verdini F.; Leo T; Dickhaus H
Classificazione: 5 Altro
Abstract: European Conference of Emergent Aspects in Clinical Data Analysis (EACDA), 2005-Pisa
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/55257 Collegamento a IRIS

2005 Principal component analysi for the evaluation of unicompartmental and total knee arthroplasty
Autore/i: Marcucci M.; Verdini F; Leo T.
Classificazione: 5 Altro
Abstract: Proceedings del congresso SIAMOC 2005-isa
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/55259 Collegamento a IRIS

2004 Effects of the complex traumas of the foot on balance
Autore/i: Verdini F.; Riccio M; MArcucci M; Pancrazi PP; Campodonico A; Aquinati A; Bertani A; Leo T
Classificazione: 5 Altro
Abstract: Short paper pubblicato su Gait & Posture ( ISSN 0966-6362) supplement 2004
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/55254 Collegamento a IRIS

2004 Gait functional evaluation of the subjects with unicompartimental and total knee arthroplasty
Autore/i: Verdini F.; Marcucci M.; Albanelli S.; Zara C.; Leo T.
Classificazione: 5 Altro
Abstract: Short paper pubblicat su Gait & Posture supplement (ISSN 0966-6362)- vol 20S (2004)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/55253 Collegamento a IRIS

2004 Functional analysys of ambulation after foot reconstructive surgery
Autore/i: Riccio M.; Verdini F.; Marcucci M.; Pancrazi PP; Campodonico A; Leo T; Bertani A
Classificazione: 5 Altro
Abstract: Euromicro 2004- Barcellona Presentazione orale
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/55256 Collegamento a IRIS

2004 Effects of the complex traumas of the foot on balance
Gait and Posture
Autore/i: F.Verdini; M.Riccio; M.Marcucci; PP.Pancrazi; A.Campodonico; A.Aquinati; A.Bertani; T.Leo
Editore: Elsevier
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63981 Collegamento a IRIS

2004 Gait functional evaluation of the subjects with unicompartimental and total knee arthroplasty
Gait and Posture
Autore/i: F.Verdini; M.Marcucci; S.Albanelli; C.Zara; T.Leo
Editore: Elsevier
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63980 Collegamento a IRIS

2004 Functional analysis of gait after surgical reconstruction due complex foot traumas
Gait and Posture
Autore/i: F.Verdini; M.Riccio; M.Marcucci; PP.Pancrazi; A.Campodonico; A.Aquinati; A.Bertani.; T.Leo
Editore: Elsevier
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63982 Collegamento a IRIS

2003 A protocol for functional evaluation of subjects with unicompartmental knee arthroplasty
Gait and Posture
Autore/i: Verdini, Federica; Pigini, Manuela; Marcucci, Mariaelena; Zara, Claudio; Leo, Tommaso; Albanelli, Stefano
Editore: Elsevier
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236724 Collegamento a IRIS

2003 Clinical and Biomechanical Analysis of Imapaired ambulation following the reconstructive surgery of the injured foot
Gait and Posture
Autore/i: Leo, Tommaso; Verdini, Federica; Riccio, Michele; Marcucci, Mariaelena; Pancrazi, Pierpaolo; Campodonico, Andrea; Aquinati, Angelica
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236728 Collegamento a IRIS

2002 Identification and characterisation of heel strike transient
Autore/i: Marcucci M.; Verdini F.; Benedetti M.G.; Leo T.
Classificazione: 5 Altro
Abstract: Abstract
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63591 Collegamento a IRIS

2002 An experimental protocol for evaluationg the effect produced by different type of shoes before and after the Heel Strike
Autore/i: Verdini F.; Marcucci M.; Benedetti M.G.; Leo T.
Classificazione: 5 Altro
Abstract: Abstract
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63592 Collegamento a IRIS

2002 The analysis of control of Functional reach test by means of force-plate only
GAIT & POSTURE
Autore/i: S. FIORETTI; VERDINI F; CATALANO C; GHETTI G; SECCHI M.G; PACE P
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31800 Collegamento a IRIS

2001 Classification of motor patterns by means of neural networks during postural tasks.
GAIT & POSTURE
Autore/i: S. FIORETTI; PULVIRENTI S; VERDINI F
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31803 Collegamento a IRIS

2001 Clasification of motor patterns by means of neural networks during postural tasks
ESMAC-SIAMOC 2001 Joint congress
Autore/i: S. FIORETTI; PULVIRENTI S.; VERDINI F.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/46821 Collegamento a IRIS

2001 A web-based training system for movement analysis students.
GAIT & POSTURE
Autore/i: T. LEO; FIORETTI S.; MAURIZI M.; VERDINI F.; MARINI M
Editore: editore attuale: ELSEVIER SCI IRELAND LTD, CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND Butterworth Heinemann Publishers:Linacre House Jordan Hill, Oxford OX2 8DP United Kingdom:011 44 1865 314569, EMAIL: bhmarketing@repp.co.uk, INTERNET: http://www.laxtonsprices.co.uk, Fax: 011 44 1865 314569
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/25354 Collegamento a IRIS

2001 Accreditation of clinical movement analysis laboratories: some considerations
Autore/i: Leo T.; Fioretti S.; Maurizi M.; Verdini F.
Classificazione: 5 Altro
Abstract: Abstract
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63594 Collegamento a IRIS

2001 Objectives for continuous education and lessons learnt by a pilot study
Autore/i: Leo T.; Fioretti S.; Maurizi M.; Bonci A.; Verdini F.
Classificazione: 5 Altro
Abstract: Abstract
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63595 Collegamento a IRIS

2001 Some preliminary considerations about incorrect muscular co-activation responsible for heel strike transient presence
Autore/i: Verdini F.; Leo T.; Fioretti S.; Benedetti M.G.; Catani F.; Giannini S.;
Classificazione: 5 Altro
Abstract: Abstract
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63593 Collegamento a IRIS

2000 A telematic system for the accreditation of clinical movement analysis laboratories
Autore/i: Leo T.; Fioretti S.; Maurizi M.; Verdini F.
Classificazione: 5 Altro
Abstract: Abstract
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63596 Collegamento a IRIS

2000 Analysis of Ground Reaction Forces by means of Wavelet Transform
CLINICAL BIOMECHANICS
Autore/i: Verdini F. ; Leo T.; Fioretti S.; Benedetti M.G.; Catani F.; Giannini S.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/62516 Collegamento a IRIS


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