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ELVIRA MARANESI

Pubblicazioni

ELVIRA MARANESI

 

42 pubblicazioni classificate nel seguente modo:

Nr. doc. Classificazioni
25 4 Contributo in Atti di Convegno (Proceeding)
10 1 Contributo su Rivista
6 2 Contributo in Volume
1 8 Tesi di dottorato
Anno Risorsa
2017 CaRiSMA 1.0: Cardiac risk self-monitoring assessment
THE OPEN SPORTS SCIENCES JOURNAL
Autore/i: Agostinelli, Angela; Morettini, Micaela; Sbrollini, Agnese; Maranesi, Elvira; Migliorelli, Lucia; Di Nardo, Francesco; Fioretti, Sandro; Burattini, Laura
Classificazione: 1 Contributo su Rivista
Abstract: Background: Sport-related sudden cardiac death (SRSCD) can only be fought through prevention. Objective: The aim of this study is to propose an innovative software application, CaRiSMA 1.0 (Cardiac Risk Self-Monitoring Assessment), as a potential tool to help contrasting SRSCD and educating to a correct training. Methods: CaRiSMA 1.0 analyzes the electrocardiographic and heart-rate (HR) signals acquired during a training session through wearable sensors and provides intuitive graphical outputs consisting of two traffic lights, one related to cardiac health, based on resting QTc (a parameter quantifying the duration of ventricular contraction and subsequent relaxation), and one related to training, based on exercise HR. Safe and worthwhile training sessions have green traffic lights. A red QTc traffic light indicates the need of a medical consultation, whereas a red HR traffic light indicate the need of a reduction of training intensity. By way of example, CaRiSMA 1.0 was applied to sample data acquired in 10 volunteers (age= 27±11 years; males/females 3/7). Results: Two acquisitions (20.0%) were rejected because too noisy, indicating that wearable sensors may record poor quality signals. The QTc traffic light was red in 1 case, indicating that people practicing sport may not be aware of being at risk. The HR traffic light was red in 0 cases. Conclusion: CaRiSMA 1.0 is a software application that, for the first time in the sport context, uses QTc, the most important index of cardiac risk in clinics. Thus, it has the potential for giving a contribution in the fight against SRSCD.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252423 Collegamento a IRIS

2016 Are the rectus femoris and the vastus lateralis concurrently recruited during walking?
IFMBE Proceedings
Autore/i: Di Nardo, Francesco; Mengarelli, A.; Strazza, A.; Maranesi, E.; Burattini, L.; Fioretti, S.
Editore: Springer Verlag
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The aim of the study was the quantitative assessment of the concomitant recruitment of rectus femoris (RF) and vastus lateralis (VL) in a group of 11 healthy young adults during walking. To this aim, Statistical gait analysis, a recent methodology performing a statistical characterization of gait by averaging spatial-temporal and surface-EMG-based parameters over numerous strides, was performed in each subject. Superimpositions between RF and VL activity were detected from terminal swing to the following loading response in 99.0±25.8% of strides. This superimposition could be intended as a synergic action of the two muscles for controlling weight bearing, to assist knee extension and to control knee flexion. A further infrequent (<5% of the strides) superimposition was detected in mid and terminal stance, suggesting that the two muscles are working on different joints: RF activity could be interpreted as active participation in hip flexion, while VL activity as the main contribution in modulating rapid knee flexion. These findings have the merit to provide a novel data on the variability of the reciprocal role of RF and VL during walking, allowing a deeper insight in the physiological mechanisms that regulate the knee flexion/extension.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236250 Collegamento a IRIS

2016 A statistical approach to discriminate between non-fallers, rare fallers and frequent fallers in older adults based on posturographic data
CLINICAL BIOMECHANICS
Autore/i: Maranesi, E; Merlo, A.; Fioretti, S.; Zemp, D.D.; Campanini, I.; Quadri, P.
Classificazione: 1 Contributo su Rivista
Abstract: Background Identification of future non-fallers, infrequent and frequent fallers among older people would permit focusing the delivery of prevention programs on selected individuals. Posturographic parameters have been proven to differentiate between non-fallers and frequent fallers, but not between the first group and infrequent fallers. Methods In this study, postural stability with eyes open and closed on both a firm and a compliant surface and while performing a cognitive task was assessed in a consecutive sample of 130 cognitively able elderly, mean age 77(7)years, categorized as non-fallers (N = 67), infrequent fallers (one/two falls, N = 45) and frequent fallers (more than two falls, N = 18) according to their last year fall history. Principal Component Analysis was used to select the most significant features from a set of 17posturographic parameters. Next, variables derived from principal component analysis were used to test, in each task, group differences between the three groups. Findings One parameter based on a combination of a set of Centre of Pressure anterior-posterior variables obtained from the eyes-open on a compliant surface task was statistically different among all groups, thus distinguishing infrequent fallers from both non-fallers (P < 0.05) and frequent fallers (P < 0.05). Interpretation For the first time, a method based on posturographic data to retrospectively discriminate infrequent fallers was obtained. The joint use of both the eyes-open on a compliant surface condition and this new parameter could be used, in a future study, to improve the performance of protocols and to verify the ability of this method to identify new-fallers in elderly without cognitive impairment.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247622 Collegamento a IRIS

2016 The surface electromyographic evaluation of the Functional Reach in elderly subjects
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
Autore/i: Maranesi, E; Fioretti, S; Ghetti, G G; Rabini, R A; Burattini, L; Mercante, O; Di Nardo, F
Classificazione: 1 Contributo su Rivista
Abstract: This study proposes a comprehensive assessment of myoelectric activity of the main muscles involved in the Functional Reach (FR) test, in 24 elderly subjects. A specific protocol for the surface electromyography (sEMG) signal acquisition during FR-test was developed. Results show that anterior muscles activate following a caudo-cranial order. Tibialis Anterior (TA) is the first to be activated (-18.0±16.3% of the FR-period), together with Rectus Femoris (-10.4±17.9%). Then, Rectus Abdominis (19.7±24.7%) and Sternocleidomastoideus (19.9±15.6%) activate after the FR-start. Hamstrings, Soleus, and L4-level Erectores Spinae (posterior muscles) activate after the FR-start in this order (11.4±16.8%, 17.7±16.6%, and 35.2±29.0%, respectively) and remain active until the movement end. The analysis of the kinematic strategies adopted by subjects revealed an association between TA-activation patterns and two kinematic strategies (hip/mixed strategy), quantified by an increase (p<0.05) of TA-activity duration in subjects adopting the hip strategy (89.9±34.5) vs. subjects adopting the mixed strategy (27.0±16.8). This suggests that TA sEMG activity could be able to discriminate among kinematic strategies, providing different information on balance control. Thus, the present analysis represents the first attempt to quantify the sEMG activity during FR-test in elderly subjects, providing an early contribution in building a reference frame for balance assessment in clinical context.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/230167 Collegamento a IRIS

2016 On the Heart-Rate Signal Provided by the Zephyr BioHarness 3.0
Proceeding of the 8th International workshop on Biosignal Interpretation
Autore/i: Nepi, D.; Agostinelli, A.; Maranesi, E.; Sbrollini, A.; Morettini, M.; Di Nardo, F.; Fioretti, S.; Burattini, L.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The BioHarness 3 system (BH3) by Zephyr is a wearable cardiac sensor specifically designed for training optimization of professional athletes. BH3 records the electrocardiogram (BH3_ECG) and the heart-rate signal (BH3_HRS). Specifically, BH3_HRS is neither the popular tachogram nor the direct not-uniformly sampled heart-rate sequence as function of time. Consequently, the aim of the present study is to gain more insights on BH3_HRS that, if found reliable, would allow a future evaluation of the possibility of a clinical use of the sensor for cardiac risk evaluation. Data were acquired from an amateur athlete (male, 25 years old) during a 5-min rest followed by a 10 min exercise. R-peak detection was performed on BH3_ECG, and the obtained heart-rate signal (HRS) was low-pass filtered using the following six filters: 3-, 4-, and 5-sample averages and 0.30 Hz, 0.35 Hz, and 0.40 Hz 6th order Butterworth low-pass filters. The filtered HRSs were then compared to BH3_HRS in terms of correlation coefficient (ρ), mean square error (MSE), resting heart-rate variability (HRV) and exercise maximum heart rate. Results indicate that the HRS closest to BH3_HRS was obtained with the 3-point average (ρ=0.9688-0.9991, MSE=0.45-0.47 mV2; comparable resting HRV and exercise maximum heart rate).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247675 Collegamento a IRIS

2016 Normative EMG patterns of ankle muscle co-contractions in school-age children during gait
GAIT & POSTURE
Autore/i: Di Nardo, Francesco; Mengarelli, Alessandro; Burattini, Laura; Maranesi, Elvira; Agostini, Valentina; Nascimbeni, Alberto; Knaflitz, Marco; Fioretti, Sandro
Classificazione: 1 Contributo su Rivista
Abstract: Purpose: The study was designed to assess the co-contractions of tibialis anterior (TA) and gastrocnemius lateralis (GL) in healthy school-age children during gait at self-selected speed and cadence, in terms of variability of onset-offset muscular activation and occurrence frequency. Methods: Statistical gait analysis, a recent methodology performing a statistical characterization of gait by averaging spatio-temporal and sEMG-based parameters over numerous strides, was performed in 100 healthy children, aged 6-11 years. Co-contractions were assessed as the period of overlap between activation intervals of TA and GL. Results: On average, 165 ± 27 strides were analyzed for each child, resulting in approximately 16,500 strides. Results showed that GL and TA act as pure agonist/antagonists for ankle plantar/dorsiflexion (no co-contractions) in only 19.2 ± 10.4% of strides. In the remaining strides, statistically significant (p < 0.05) co-contractions appear in early stance (46.5 ± 23.0% of the strides), mid-stance (28.8 ± 15.9%), pre-swing (15.2 ± 9.2%), and swing (73.2 ± 22.6%). This significantly increased complexity in muscle recruitment strategy beyond the activation as pure ankle plantar/dorsiflexors, suggests that in healthy children co-contractions are likely functional to further physiological tasks as balance improvement and control of joint stability. Conclusions: This study represents the first attempt for the development in healthy children of a normative dataset for GL/TA co-contractions during gait, achieved on an exceptionally large number of strides in every child and in total. The present reference frame could be useful for discriminating physiological and pathological behavior in children and for designing more focused studies on the maturation of gait.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234881 Collegamento a IRIS

2016 Validation of the Heart:Rate Signal Provided by the Zephyr BioHarness 3.0
Computing in Cardiology 2016
Autore/i: Nepi, Daniele; Sbrollini, Agnese; Agostinelli, Angela; Maranesi, Elvira; Morettini, Micaela; Di Nardo, Francesco; Fioretti, Sandro; Pierleoni, Paola; Pernini, Luca; Valenti, Simone; Burattini, Laura
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The Zephyr BioHarness 3.0 (BH3) is a popular wearable system specifically designed for training optimization of professional athletes. BH3 provides the electrocardiogram (ECG BH3) and the heart-rate signal (HRSBH3). Aim of this study is to evaluate the reliability of HRSBH3 to assess its clinical applicability to the general population for cardiac-risk evaluations. Data were acquired from 10 healthy subjects (age: 34±17 years) during a 5-minutes rest. Since the tachogram represents the standard signal for studying the heart rate (HR) and its variability, ECG BH3 was elaborated in order to get the tachogram (HRSTG). HRSBH3 and HRSTG were compared in terms of mean HR (MHR, bpm), HR standard deviation (HRSD, bpm) and HRSD error (bpm). HRSBH3 and HRSTG provided comparable MHR (73.07±15.53 bpm vs 72.86±15.57 bpm, respectively) while HRSD by HRSBH3 was significantly lower than HRSD by HRS TG (4.51 ±2.29 bpm vs 5.63±2.99 bpm, respectively; P=0.0043). HRSD error was significantly greater than zero (0.20-3.00 bpm; P=0.0043); moreover, it was strongly correlated to HRSD by HRS TG (p=0.82, P=0.0036). Thus, HRS BH3 is appropriate only for sport applications based on MHR estimations, but not to clinical evaluations based on HRV measurements.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246953 Collegamento a IRIS

2016 Evaluation of the low-frequency components in surface electromyography
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
Autore/i: Sbrollini, Agnese; Agostinelli, Angela; Di Nardo, Francesco; Maranesi, Elvira; Mengarelli, Alessandro; Fioretti, Sandro; Burattini, Laura
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The surface electromyogram (SEMG) is a signal noninvasively (through electrodes located on the body surface) acquired for evaluating the electrical activity produced by skeletal muscles. In thoracic acquisitions, SEMG is typically affected by the electrocardiographic (ECG) signal, representing the electrical activity of the heart. SEMG and ECG power spectra mainly fall within 5-450 Hz and 0.05-50 Hz, respectively. Consequently, SEMG and ECG components overlap in the 5-50 Hz range. Although removing SEMG low spectral components, high-pass linear filtering (LF) with a cut-off frequency of 20 Hz remains the standard technique to clean SEMG from ECG. Thus, the aim of the present study was to propose the Segmented Beat Modulation Method (SBMM) as a tool to clean SEMG from ECG without removing SEMG components below 20 Hz. A SEMG recording was first acquired from the left rectus abdominis of a subject, and then filtered using both SBMM and LF. Filtered SEMGs obtained with the two techniques were compared. Results indicate that SBMM eliminates ECG interference from SEMG better than LF, since the latter procedure maintains ECG components between 20 and 50 Hz. In addition, after ECG removal by SBMM, SEMG showed a significant amount of spectral components (up to 20%) in the low-frequency range. Maintaining such low-frequency components, which go lost when applying LF, is desirable since they likely associate to the firing rates of the active motor units. In conclusion, SBMM represents a useful tool to clean SEMG from ECG without loss of frequency components.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/245029 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

2016 sEMG-based evaluation of muscle recruitment variability during walking in terms of activation length and occurrence frequency
Lecture Notes in Electrical Engineering
Autore/i: Mengarelli, A.; Maranesi, E.; Burattini, L.; Fioretti, S.; Di Nardo, F
Editore: Springer Verlag
Classificazione: 2 Contributo in Volume
Abstract: Surface electromyography (sEMG) is commonly used in gait analysis for detecting muscle activity in a non-invasive way, preserving the normal mobility of the subject. The purpose of the study was to assess the variability of sEMG signals acquired from lower-limb muscles during walking. To this aim, a statistical analysis of sEMG signals from a large number (hundreds) of strides per subject was performed in twenty-two healthy young caucasian volunteers. Tibialis Anterior, Gastrocnemius Lateralis, Rectus Femoris, Biceps Femoris and Vastus Lateralis were selected to represent both proximal and distal leg segments. Besides the muscular activation onset-offset instants, the study was aimed to analysed the occurrence frequency of muscle recruitment, a parameter seldom considered because of the low number of strides usually analysed in classic EMG studies. Findings illustrated that a single muscle showed a different number of activation intervals in different strides of the same walking. The number of times when muscle activates during a single gait cycle defined the modality of muscle recruitment, that in the present study was referred to as activation modality, i.e. n-activation modality consists of n-activation intervals for the considered muscle, during a single gait cycle. For each of the selected muscles, five activation modalities were detected. Each of these activation modalities is characterized by a different occurrence frequency and by different onset-offset activation instants. Concomitance of these results indicates a large variability in onset-offset muscular activation and occurrence frequency, which should be considered in discriminating pathological from physiological behaviour and for designing focused gait studies.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/240328 Collegamento a IRIS

2016 The wireless surface electromyographic technique for supporting the assessment of fall risk in diabetic neuropathic patients
Lecture Notes in Electrical Engineering
Autore/i: Maranesi, E; Fioretti, S.; Barone, V.; Ghetti, G.G.; Mercante, O.; Rabin, R.A.; Burattini, L.; Di Nardo, F.
Editore: Springer Verlag
Classificazione: 2 Contributo in Volume
Abstract: The Functional Reach (FR) Test is commonly used in the clinical practice to identify elderly subjects at risk of recurrent falls. This study was designed to provide a useful tool for supporting the assessment of fall risk in diabetic neuropathic (DN) subjects: a non-invasive analysis of muscle activation patterns involved in the FR test using wireless surface electromyography (sEMG). Kinematic analysis was also performed to support results achieved by sEMG technique. A population of diabetic non-neuropathic subjects was considered as control group (CTRL). Kinematics was acquired by a 6-camera Elite optoelectronic system and passive markers were placed according to Davis protocol, with an additional marker placed on dominant wrist. sEMG analysis of Sternocleidomastoideus, Rectus Abdominis, Erectores Spinae at L4 level (L4), Rectus Femoris, Hamstrings (Ham), Tibialis Anterior (TA) and Soleus (Sol) was performed. No significant differences (p-value for evaluation of statistical significance was <0.05) were detected between groups in the computed kinematics parameters. sEMG analysis shows that in CTRL subjects, TA was identified as the first motor, since it activates before the start of FR movement; its action can be attributed to the anticipatory muscular activity necessary to initiate the body forward displacement. Sol and Ham, followed by L4, act mainly as tonic muscles, opposing the movement and preventing falls. Compared to CTRL group, DN subjects show an anticipatory recruitment of TA. The earlier activation of TA in DN group suggests that this anticipation could be a predictor of a greater propensity of the DN subjects to fall compared to non-neuropathic diabetic subjects.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/240337 Collegamento a IRIS

2016 A method for computing the Functional Ambulation Profile score by stereophotogrammetric data
Lecture Notes in Electrical Engineering
Autore/i: Maranesi, E; Petrini, M.; Ghetti, G.G.; Mercante, O.; Barone, V.; Burattini, L.; Di Nardo, F.; Fioretti, S.
Editore: Springer Verlag
Classificazione: 2 Contributo in Volume
Abstract: The Functional Ambulation Profile (FAP) Score is a performance index based on the assessment of selected time and distance parameters, during standard gait test. FAP is considered a reliable global parameter for gait evaluation. The first and original FAP score is provided in an automatic way by the GAITRite System, a portable electronic mat embedded with pressure-activated sensors. The present study was designed to achieve a FAP score computation which could be independent from its native environment, and could be implemented by means of classic gait analysis systems, as stereophotogrammetry. This goal was pursued computing the parameters, which FAP definition is based on, by means of processing of stereophotogrammetric data. The reliability of FAP computation was tested by direct comparison with the original GAITRite FAP score, in a single subject, during different walking trials (comfortable gait, very slow gait; very fast gait) and simulating several pathological gaits (gait with small step; “foot-drop” gait; “festinating” gait; “spastic” gait). No relevant differences detected between stereophotogrammetry-based and GAITRitebased estimates indicate that the proposed method is able to provide a reliable assessment of FAP in different kind of natural/pathological walking. The capability of FAP index to identify alterations of walking is also preserved. In conclusion, this study proposes the stereophotogrammetry-based computation of FAP as a valid alternative to the original GAITRite FAP. The convenience of an easy integration with classic stereophotogrammetry-based gait analysis parameters, supports the usefulness of stereophotogrammetry-based FAP in providing a complete picture of subject walking, without needing a further measurement system.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/240335 Collegamento a IRIS

2016 Health monitoring in sport through wearable sensors: A novel approach based on heart-rate variability
Lecture Notes in Electrical Engineering
Autore/i: Maranesi, E.; Morettini, M.; Agostinelli, A.; Giuliani, C.; Di Nardo, F.; Burattini, L.
Editore: Springer Verlag
Classificazione: 2 Contributo in Volume
Abstract: Sudden cardiac death (SCD) is one of the leading cause of death during sport activities. Heart rate (HR) and HR variability (HRV) provide a measure of how the organism adapts to physical fatigue, and can be monitored by commercial wearable sensors. Still, HR and HRV, widely used to optimize a training session, were rarely used to evaluate the athlete’s health-status, even though widely known to provide indexes of risk for SCD. This work, developed in collaboration with Bio-Medical Engineering Development Srl, aims to provide a contribution to the problem of preventive identification of athletes at increased risk of SCD, by developing and testing a low-cost, large-scale procedure for HR and HRV monitoring from signals obtained using comfortable wearable sensors. To this aim a new protocol for the acquisition of the tachogram was proposed. It included recordings of the signals during resting, exercise and recovery phases, to allow evaluation of prevention as well as performance indexes. The procedure was tested on 10 sedentary subjects (SS) and 10 amateur athletes (AA). Compared to SS, AA showed a better health-status, quantified in a lower resting HR (63 bpm vs. 73 bpm; P < 0.005) and a higher resting HRV (29 ms vs. 23 ms; P < 0.05), and a better performance level, quantifies in a lower recovery time (130 ms vs. 174 ms; P < 0.05). Thus, the proposed procedure allows evaluation of both the health-status and the performance level of an athlete, and represents a valuable tool to contrast SCD in sport.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/240332 Collegamento a IRIS

2015 Gender differences in the myoelectric activity of lower limb muscles in young healthy subjects during walking
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
Autore/i: Francesco Di Nardo; Alessandro Mengarelli; Elvira Maranesi; Laura Burattini; Sandro Fioretti
Classificazione: 1 Contributo su Rivista
Abstract: The present study was designed to achieve a comprehensive analysis of gender-related differences in themyoelectric activity of lower limb muscles during normal walking at self-selected speed and cadence,in terms of muscle activation patterns and occurrence frequencies. To this aim, statistical gait analysis(SGA) of surface EMG signal from tibialis anterior (TA), gastrocnemius lateralis (GL), rectus femoris (RF),biceps femoris (BF) and vastus lateralis (VL) was performed in 11 female (F-group) and 11 male (M-group)age-matched healthy young adults. SGA is a recent methodology performing a statistical characteriza-tion of gait, by averaging spatio-temporal and sEMG-based parameters over numerous strides. Findingsshowed that males and females walk at the same comfortable speed, despite the significantly lowerheight and higher cadence detected in females. No significant differences in muscle onset/offset weredetected between groups. The analysis of occurrence frequencies of muscle activity showed no signif-icant differences in BF and RF, between groups. Conversely, in F-group, compared with M-group, GL,TA and VL showed a significantly higher occurrence frequency in the modalities with a high number ofactivations, and a significantly lower occurrence frequency in the modalities with a low number of acti-vations. These findings indicate a propensity of females for a more complex recruitment of TA, GL and VLduring walking, compared to males. The observed differences recommend the suitability of developingelectromyographic databases, separated for males and females.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/224133 Collegamento a IRIS

2015 A biomechanical model for the evaluation by electrogoniometry of spatio-temporal parameters during walking
INTERNATIONAL JOURNAL OF BIOMECHATRONICS AND BIOMEDICAL ROBOTICS
Autore/i: Maranesi, Elvira; DI NARDO, Francesco; Giacomo, G. GHETTI; Burattini, Laura; Fioretti, Sandro
Classificazione: 1 Contributo su Rivista
Abstract: The aim of the study is to propose a new methodology to assess step length, duration and speed, using only two 1-degree-of-freedom electrogoniometers, positioned on hip and knee joints. To this purpose, a novel model was introduced, which represents the lower limb modelled as two rigid segments (thigh and shank). Model validation was performed comparing the results with those automatically achieved from two classic gait analysis systems (a 6-camera stereophotogrammetric system and GAITRite), during walking at three different speeds (natural, fast and slow). The absence of significant differences among parameter values estimated by the three systems indicates a strong reliability of the model. Thus, the study candidates this electrogoniometer-based model as a reliable and not expensive tool for an easy and flexible assessment of spatio-temporal gait parameters in normal subjects, and propose it as a valid alternative to traditional methods using foot switches, ground reaction forces, IMU or stereo-photogrammetric systems.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/228445 Collegamento a IRIS

2015 Assessment of the variability of vastii myoelectric activity in young healthy females during walking: A statistical gait analysis
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
Autore/i: Di Nardo, Francesco; Maranesi, Elvira; Mengarelli, Alessandro; Ghetti, Giacomo; Burattini, Laura; Fioretti, Sandro
Classificazione: 1 Contributo su Rivista
Abstract: The study was designed to assess the natural variability of the activation modalities of vastus medialis (VM) and vastus lateralis (VL) during walking at a self-selected speed and cadence of 30 young, healthy, females. This was achieved by conducting statistical gait analysis on the surface electromyographic signals from hundreds of strides for each subject. Results revealed variability in the number of activations, occurrence frequency, and onset-offset instants across the thousands of strides analyzed. However, despite the variability, there was one activation occurrence which remained consistent across subjects for both VM and VL. This occurred from terminal swing to the following loading response (observed in 100% of strides). A second, less frequent, activation occurred between mid-stance up to pre-swing (observed in 39.3 ± 22.4% of strides for VM and in 35.1 ± 20.6% for VL). No significant differences (p>. 0.05) were observed in the onset-offset instants or in the occurrence frequency, which suggest a simultaneous recruitment of VM and VL. This "normality" pattern represents the first attempt at developing a reference frame for vastii sEMG activity during walking, that is able to include the physiological variability of the phenomenon and control the confounding effects of age and gender.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/228439 Collegamento a IRIS

2015 Assessment of the surface electromyographic activity of thigh muscles in males and females
INTERNATIONAL JOURNAL OF BIOMECHATRONICS AND BIOMEDICAL ROBOTICS
Autore/i: DI NARDO, Francesco; Mengarelli, Alessandro; Maranesi, Elvira; Burattini, Laura; Fioretti, Sandro
Classificazione: 1 Contributo su Rivista
Abstract: Surface electromyographic (sEMG) signal is commonly used as input information to control robotic systems. sEMG signals vary from person to person; gender is a factor influencing this variation. The aim of the study is to detect gender-related differences in sEMG activity of main three thigh muscles (rectus femoris, RF, biceps femoris, BF and vastus lateralis, VL) during walking at comfortable speed and cadence. Statistical analysis of sEMG signals, performed in seven male (M-group) and seven female (F-group) adults, showed clear gender-related differences in VL behavior and no relevant differences in the behavior of RF and BF. F-group, indeed, adopts a walking modality with a higher number of VL activations during gait cycle, compared to M-group. This suggests a female propensity for a more complex VL recruitment, during walking. This novel information suggests considering separate approaches for males and females, in providing electromyographic signals as input information to control robotic systems.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/228448 Collegamento a IRIS

2015 Assessment of the ankle muscle co-contraction during normal gait: A surface electromyography study
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
Autore/i: Francesco Di Nardo; Alessandro Mengarelli; Elvira Maranesi; Laura Burattini; Sandro Fioretti
Classificazione: 1 Contributo su Rivista
Abstract: The study was designed to assess the co-contractions of tibialis anterior (TA) and gastrocnemius lateralis (GL) in healthy young adults during gait at self-selected speed and cadence, in terms of variability of onset–offset muscular activation and occurrence frequency. Statistical gait analysis (SGA), a recent methodology performing a statistical characterization of gait by averaging spatio-temporal and EMG-based parameters over numerous strides, was performed in twenty-four healthy young adults. Co-contractions were assessed as the period of overlap between activation intervals of TA and GL. Results showed that GL and TA act as pure agonist/antagonists for ankle plantar/dorsiflexion (no co-contractions) in only 21.3 ± 8.2% of strides. In the remaining strides, statistically significant (p < 0.05) co-contractions appear in early stance (29.2 ± 1.7%), mid-stance (32.1 ± 18.3%) and swing (62.2 ± 2.0%). This significantly increased complexity in muscle recruitment strategy beyond the activation as pure ankle plantar/dorsiflexors, suggests that cocontractions are likely functional to further physiological tasks as foot inversion, balance improvement, control of ankle stability and knee flexion. This study represents the first attempt for the development in healthy young adults of a ‘‘normality’’ reference frame for GL/TA co-contractions, able to include the physiological variability of the phenomenon and eliminate the confounding effect of age.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205328 Collegamento a IRIS

2015 Evaluation of gender-related differences in co-contraction activity of shank muscles during gait
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
Autore/i: Mengarelli, A.; Maranesi, E.; Barone, V.; Burattini, L.; Fioretti, S.; Di Nardo, F
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This study aims to investigate the possible differences between genders in co-contractions of tibialis anterior (TA) and gastrocnemius lateralis (GL), during walking at self-selected speed. To this purpose, the statistical gait analysis (SGA) was performed on seven female (F-group) and seven male (M-group) adults. SGA is a recently developed methodology for the characterization of gait, by averaging spatiotemporal and electromyographic parameters over hundreds of strides per subject. Co-contractions were assessed as the overlapping periods between TA and GL activity. Results showed that four co-contraction intervals are present during gait cycle in both groups. No relevant differences between genders were detected in onset-offset time instants of co-activations or in their temporal length. On the contrary, significant differences were observed in the number of strides where each co-contraction happens (i.e. the occurrence frequency). All the four co-contraction intervals result significantly (p<0.05) more recurrent in females compared to males. This outcome suggests a larger presence of co-contraction activity in females walking, related to a female tendency for a more complex muscular strategy during gait. These findings could be useful to better understand gender differences in walking mechanisms and to develop separated normal walking reference frames for males and females.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234913 Collegamento a IRIS

2015 The occurrence frequency: A suitable parameter for the evaluation of the myoelectric activity during walking
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
Autore/i: Di Nardo, Francesco; Agostini, Valentina; Knaflitz, Marco; Mengarelli, Alessandro; Maranesi, Elvira; Burattini, Laura; Fioretti, Sandro
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Many studies have recently addressed the quantification of the natural variability of myoelectric activity during walking, considering hundreds of strides. The availability of so many strides allows assessing a parameter seldom considered in classic surface EMG (sEMG) studies: the occurrence frequency, defined as the frequency each muscle activation occurs with, quantified by the number of strides in which a muscle is recruited with that specific activation modality. Aim of this study is to point out the occurrence frequency as a suitable parameter for the evaluation of the variability of the myoelectric activity during walking. This goal was pursued by means of the statistical gait analysis of sEMG signal acquired from Gastrocnemius Lateralis (GL) in six healthy subjects, with different characteristics. Results show that among these six subjects relevant differences were not detected in the temporal parameters, i.e., activation onset/offset instant and activation duration. In the same subjects, the values of the occurrence frequency ranged from 3% to 74% in the different activation modalities, indicating a large variability of this parameter. These findings show that occurrence frequency is able to provide further and different information with respect to classical temporal parameters. Thus, the occurrence frequency is proposed as a suitable parameter to support the classic temporal parameters in the evaluation of variability of myoelectric activity during walking.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234917 Collegamento a IRIS

2015 Comparison of ankle-muscles activity between school-aged children and young adults during gait: An electromyographic analysis
2015 12th International Workshop on Intelligent Solutions in Embedded Systems, WISES 2015
Autore/i: Mengarelli, A.; Fioretti, S.; Maranesi, E.; Burattini, L.; Di Nardo, F.; Agostini, V.; Knaflitz, M.; Nascimbeni, A.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Electrocardiogram (ECG) represents, with the electroencephalogram (EEG), the principal bio-vital signals, providing information on the human physical condition. Although surface electromyogram (sEMG) is not classified as bio-vital, it is frequently used to integrate and increase information obtained from ECG and EEG, making these three signals the main electric-biological signals. The sEMG is widely used for the assessment of muscular activity during gait, providing valuable information in particular for subjects presenting impaired or non-completely developed gait, like children. Thus, this study aimed to quantify and compare lower limb muscle activity during walking in healthy, school-aged children (C-group) and young adults (A-group). The statistical analysis of tibialis anterior (TA) and gastrocnemius lateralis (GL) myoelectric signal revealed the absence of any significant difference between the two groups in the activation modalities adopted by both muscles, in terms of temporal characteristics and occurrence frequency. These outcomes underline similar activation patterns for children and adults during gait, confirming the hypothesis about an achieved mature gait in 6-to-8-year-old children, also in terms of sEMG activity. The findings of this study could help for better understanding the degree of mature gait advancement in children and for discriminating muscular physiological behavior in healthy and pathological children
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234889 Collegamento a IRIS

2015 Myoelectric activity of antagonist ankle-muscles in 6-to-8-year-old children during walking
2015 12th International Workshop on Intelligent Solutions in Embedded Systems, WISES 2015
Autore/i: Di Nardo, Francesco; Mengarelli, Alessandro; Maranesi, Elvira; Burattini, Laura; Fioretti, Sandro; Agostini, Valentina; Knaflitz, Marco; Nascimbeni, Alberto
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Great co-contraction, i.e. simultaneous contraction of agonist and antagonist muscles crossing a joint, of ankle muscles during the stance phase has been identified as one of the typical features of the immature gait. The goal of the present study was the assessment of the co-contractions of tibialis anterior (TA) and gastrocnemius lateralis (GL) during walking in 20 healthy 6-to-8-year-old children, critical age for the maturation of gait. To this aim, Statistical gait analysis, a recent methodology performing a statistical characterization of gait by averaging spatial-temporal and surface-EMG-based parameters over numerous strides, was performed in each subject. Co-contractions were assessed as the period of overlap between activation intervals of TA and GL. Results showed that GL and TA act as pure antagonists for ankle plantar/dorsiflexion (no co-contractions) in only 18.7% of strides. In the remaining strides, statistically significant (p<0.05) co-contractions were detected in early stance (45.0% of the strides), mid-stance (27.7%), pre-swing (14.6%), and swing (74.1%). The presence of all these different kinds of ankle-muscle co-contractions seems to suggest the need of a stabilizing control in children, supporting the hypothesis that a young neurocontrol system can operate on more degrees of freedom. In conclusion, the present analysis represents the first attempt for providing a quantitative assessment for ankle-muscle co-contraction in healthy 6-to-8-year-old children, in order to give further information on the maturation of gait in children.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234891 Collegamento a IRIS

2015 Assessment of the activation patterns of the muscles involved in the FR test in diabetic neuropathic patients
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
Autore/i: Maranesi, E; Di Nardo, F.; Ghetti, G.G.; Mercante, O.; Rabini, R.A.; Burattini, L.; Fioretti, S.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This study was designed to assess, in elderly neuropathic diabetic (DN) patients, the activation patterns of the main muscles involved in the Functional Reach (FR) Test, a well-recognized method to identify elderly subjects at risk of recurrent falls. Surface electromyographic (sEMG) analysis of Sternocleidomastoideus (Scm), Rectus Abdominis (RAbd), Erectores Spinae at L4 level (L4), Rectus Femoris (RF), Hamstrings (Ham), Tibialis Anterior (TA) and Soleus (Sol) was performed to this aim. Results in DN patients are compared with a control group (CH) of healthy age-matched subjects. In DN patients, TA is identified as the first muscle to be recruited (ON at -34% of the FR-period) before the movement start, in order to initiate the body forward displacement. RF is the first muscle to be recruited after TA and, togheter with RAbd, showed a progressive earlier onset from CH group. Sol and Ham (ON after the FR-start), followed by L4, act mainly as tonic muscles, opposing the movement and preventing falls. Compared to the CH group, the DN subjects show an anticipatory recruitment (-34%±6%) of TA, showing a statistically significant difference (p<0.05) in comparison to CH group, together with the Scm activation. Results suggest a trend of DN patients in anticipating the activation of the anterior muscles of the body. This is likely due to an attempt to compensate the neuropathy-related proprioception dysfunction and to adjust the movement timing. In conclusion, the present study shows that sEMG is a suitable tool to deepen the interpretation of the FR-test execution and proposes the earlier start of TA as a possible element to identify the presence of neuropathy in diabetic subjects
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234918 Collegamento a IRIS

2015 Cleaning the electrocardiographic signal from muscular noise
2015 12th International Workshop on Intelligent Solutions in Embedded Systems, WISES 2015
Autore/i: Burattini, L.; Agostinelli, A.; Maranesi, E.; Sbrollini, A.; Fioretti, S.; Di Nardo, F.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Electrocardiography is a simple clinically useful non-invasive technique to evaluate the activity of the heart. The heart rate is very variable parameter and sometimes reaches very high values. In these cases, the frequency band of the electrocardiographic (ECG) signal overlaps the band of the surface electromyographic (sEMG) signal, which it represents an interfering signal. The aim of the present study is to show how the Segmented Beat Modulation Method (SBMM) can be used to clean the ECG signal from muscular noise. To this aim, a real ECG signal (characterized by a fast heart rate and corrupted by muscular noise) was acquired from a violinist while he was playing. Results indicate that the ECG and the sEMG signal can be separated without losing morphological features and spectral components of both signals. Thus SBMM is a promising tool for cleaning the ECG signal from muscular noise.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236110 Collegamento a IRIS

2014 Functional Reach Test: Movement Strategies in Diabetic Subjects
GAIT & POSTURE
Autore/i: Maranesi E; Ghetti G; Rabini RA; Fioretti S
Classificazione: 1 Contributo su Rivista
Abstract: Functional reach (FR) is a clinical measure, defined as the maximum distance one can reach, forward beyond arm’s length, able to identify elderly subjects at risk of recurrent falls. Subjects, exhibiting the same FR can perform the motor task in different ways: a kinematic analysis of the FR, task can help to identify the motor strategy adopted. The FR test was applied to 17 diabetic non-neuropathic, (CTRL) and 37 neuropathic (DN) subjects. Motor strategies adopted were defined as: ‘‘hip’’ or ‘‘other’’ strategy; the latter included: ‘‘mixed’’ and ‘‘trunk rotation’’ strategies. Principal Component Analysis and nonparametric statistical tests were used to study the different execution modalities of the FR test. Results show that, in CTRL, the most important parameters are those related to trunk flexion in the sagittal plane. Instead, for DN, the main features are related not only to trunk flexion but also to trunk rotation in the transverse plane. Percentages of subjects who used ‘‘hip’’ or ‘‘other’’ strategies are similar for CTRL and DN subjects. However, within the ‘‘other’’ strategy group, the percentage of DN that used a ‘‘trunk rotation’’ strategy was much higher than for CTRL. Results show that individuals, although exhibiting the same reaching distance, adopt different movement strategies. Consequently it is important to evaluate the kinematic behaviour and not only the clinical measure, because the evaluation of the motor strategy might be useful in the early detection of subjects at risk of postural instability
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/112687 Collegamento a IRIS

2014 Valutazione stereofotogrammetrica del Functional Ambulation Profile (FAP)
Menti Attive. La ricerca in Riabilitazione nelle Marche
Autore/i: Marta Petrini; Giacomo Ghetti; Elvira Maranesi; Sandro Fioretti; Oriano Mercante
Editore: Oriano Mercante
Luogo di pubblicazione: Ancona
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205800 Collegamento a IRIS

2014 ASSESSMENT OF WALKING SPEED BY A GONIOMETER-BASED METHOD
Engineering in Medicine and Biology Society (EMBC), 2014 36th Annual International Conference of the IEEE
Autore/i: Maranesi E; Barone V; Fioretti S
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A quantitative gait analysis is essential to evaluate the kinematic, kinetic and electromyographic gait patterns. These patterns are strongly related to the individual spatio-temporal parameters that characterize each subject. In particular, gait speed is one of the most important spatio-temporal gait parameters: it influences kinematic, kinetic parameters, and muscle activity too. The aim of the present study is to propose a new method to assess stride speed using only 1-degree-of-freedom electrogoniometers positioned on hip and knee joints. The model validation is performed comparing the model results with those automatically obtained from another gait analysis system: GAITRite. The results underline the model reliability. These results show that essential spatio-temporal gait parameters, and in particular the speed of each stride, can be determined during normal walking using only two 1-dof electrogoniometers. The method is easy-to-use and does not interfere with regular walking patterns.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/206913 Collegamento a IRIS

2014 Functional Reach Test evaluated by wireless surface electromyography: a non-invasive assessment of fall risk in diabetic patients
MBIDA - Proceedings of the International Workshop Mobile Networks for Biometric Data Analysis
Autore/i: E. Maranesi; S. Fioretti; L. Burattini; F. Di Nardo
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This study analyzed the Functional Reach Test used in the clinical practice to identify elderly subjects at risk of recurrent falls. This study was designed to assess the fall risk in diabetic neuropathic subjects by means a non-invasive analysis of muscle activation patterns involved in the FR test using a wireless surface electro-myography. A population of diabetic non-neuropathic subjects was also considered, as control group for neuropathy. Surface electromyographic analysis of Sternocleido-mastoideus (Scm), Rectus Abdominis (RAbd), Erectores Spinae at L4 level (L4), Rec-tus Femoris (RF), Hamstrings (Ham), Tibialis Anterior (TA) and Soleus (Sol) was per-formed to this aim. In CTRL subjects, TA was identified as the first motor, since it activates before the start of FR period; its action can be attributed to the anticipatory muscular activity necessary to initiate the body forward displacement. Then, a caudo-cranial activation sequence of the anterior muscles was observed. Sol and Ham, fol-lowed by L4, act mainly as tonic muscles, opposing the movement and preventing falls. Compared to the CTRL group, the DN subjects show an anticipatory recruitment of TA. Results suggest that the anticipatory postural adjustment patterns exerted dur-ing the FR task and the earlier activation of TA in the diabetic neuropathic subjects could be the predictor of a greater propensity of this groups to the fall compared to di-abetic without neuropathy.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205334 Collegamento a IRIS

2014 Influence of gender on the myoelectric signal of shank muscles
2014 IEEE/ASME 10th International Conference on Mechatronic and Embedded Systems and Applications (MESA)
Autore/i: Di Nardo, F; Mengarelli, A; Maranesi, E; Burattini, L; Fioretti, S
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The surface electromyographic (sEMG) signal is commonly utilized as principal input information to the controller of robotic systems, such as exoskeleton robots. It has been shown that sEMG signals could vary from subject to subject, and that gender is one of the factors influencing this variation. Thus, the goal of this study is to detect possible gender-related differences in the EMG activity of the two main ankle-flexor muscles (tibialis anterior, TA and gastrocnemius lateralis, GL) during gait at comfortable speed and cadence. The statistical analysis of surface EMG signals, performed in seven male (M-group) and seven female (F-group) age-matched adults, showed clear gender-related differences in the behavior of TA and GL. The estimation of the different activation modalities, indeed, permitted to detect that F-group choose a walking modality with a more elevated number of activations during gait cycle, compared to M-group. This suggests a propensity of females for a more complex recruitment of the muscles during gait. The novel information on gender-related differences provided here suggest considering a separate approach for males and females, in providing electromyographic signals as input information to the controller of exoskeleton robot.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205330 Collegamento a IRIS

2014 Influence of gender on the myoelectric signal of thigh muscles
2014 IEEE/ASME 10th International Conference on Mechatronic and Embedded Systems and Applications (MESA)
Autore/i: F. Di Nardo; A. Mengarelli; E. Maranesi; L. Burattini; S. Fioretti
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The surface electromyographic (EMG) signal is commonly used as main input information to the controller of robotic systems, such as exoskeleton robots. It has been shown that EMG signals could vary from person to person, and that gender is one of the factors influencing this variation. Thus, the aim of the present study is to detect possible gender-related differences in the EMG activity of the main thigh muscles (rectus femoris (RF), biceps femoris (BF) and vastus lateralis (VL), during gait at self-selected speed and cadence. The statistical analysis of surface EMG signals, performed in seven male (M-group) and seven female (F-group) age-matched adults, showed clear gender-related differences, in terms of frequency of occurrence, in the behavior of VL, and no relevant differences in the behavior of RF and BF. This suggests a propensity of females for a more complex recruitment of the muscles during gait, performed mainly by muscles involved in the motion of the lower leg joints. The novel informations on gender-related differences provided here suggest considering a separate approach for males and females, in providing electromyographic signals as input information to the controller of exoskeleton robot.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205329 Collegamento a IRIS

2014 A non-invasive assessment of variability in sEMG signals from lower limb muscles during gait
MBIDA - Proceedings of the International Workshop Mobile Networks for Biometric Data Analysis
Autore/i: Alessandro Mengarelli; Elvira Maranesi; Laura Burattini; Sandro Fioretti; Francesco Di Nardo
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Surface electromyography (sEMG) is commonly used in gait analysis for detecting muscle activity in a non-invasive way, preserving the normal mobility of the subject. Aim of this study was to assess the variability of sEMG signals acquired from lower limb muscles during gait at self-selected speed and cadence, in terms of onset-offset muscular activation and frequency of occurrence. To this aim, a statistical analysis of sEMG signals from Tibialis Anterior, Gastrocnemius Lateralis, Rectus Femoris, Biceps Femoris and Vastus Lateralis was performed in twenty-two healthy young volunteers. Findings illustrated that a single muscle can show a different number of activation intervals in different strides of the same walk. Moreover, muscles showed activity also in phases of the gait cycle usually not reported in healthy adults that could be related to tasks different from the typical sagittal plane movement, as foot inversion, balance improvement during single support and control of joint dynamic stability. The concomitance of these results indicates a large variability in onset-offset muscular activation and occurrence frequency, which should be considered in discriminating pathological from physiological behaviour and for designing more focused gait studies.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205333 Collegamento a IRIS

2014 INTEGRATION OF SMARTPHONES AND WEBCAM FOR THE MEASURE OF SPATIOTEMPORAL GAIT PARAMETERS
Engineering in Medicine and Biology Society (EMBC), 2014 36th Annual International Conference of the IEEE
Autore/i: Barone V; Maranesi E; Fioretti S
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: of last generation smartphones and a highdefinition webcam, controlled by a laptop. The system can be used to analyze mainly planar motions in non-structured environments. In this paper, the accelerometer signal as captured by the 3D sensor embedded in one smartphone, and the position of colored markers derived by the webcam frames, are used for the computation of spatial-temporal parameters of gait. Accuracy of results is compared with that obtainable by a gold-standard instrumentation. The system is characterized by a very low cost and by 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/11566/206915 Collegamento a IRIS

2014 A goniometer-based method for the assessment of gait parameters
2014 IEEE/ASME 10th International Conference on Mechatronic and Embedded Systems and Applications (MESA)
Autore/i: E. Maranesi; F. Di Nardo; G. Ghetti; L. Burattini; S. Fioretti
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Basic prerequisites for gait analysis are the assessment of spatiooral gait parameters and the analysis of movements within subsequent stride cycles. The aim of the present study is to propose a new method to assess spatiooral gait parameters using only 1-degree-of-freedom electrogoniometers positioned on hip and knee joints. The model validation is performed comparing the model results with those automatically obtained from another gait analysis system: GAITRite. The results underline the model reliability and show that the model could be a valid alternative to the traditional methods that use foot switches, ground reaction forces or accelerometers. These results show that essential spatiooral gait parameters can be determined during overground walking using only two 1-dof electrogoniometers. The method is easy-to-use and does not interfere with regular walking patterns.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205331 Collegamento a IRIS

2014 Preventing sudden cardiac death in sports: a novel monitoring service of the heart-rate variability trough wearable sensors
MBIDA - Proceedings of the International Workshop Mobile Networks for Biometric Data Analysis
Autore/i: E Maranesi ; M Morettini ; F Palmieri; F Di Nardo; L Burattini
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205745 Collegamento a IRIS

2014 An innovative approach to compute the Functional Ambulation Profile (FAP) Score
MBIDA - Proceedings of the International Workshop Mobile Networks for Biometric Data Analysis
Autore/i: E. Maranesi; M. Petrini; G. G. Ghetti; O. Mercante; L. Burattini; F. Di Nardo; and S. Fioretti
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The Functional Ambulation Profile (FAP) Score, a global parameter of gait, is a performance index which integrates selected time and distance parameters, obtained during a standard gait test. The FAP score ranges from 95 to 100 points in the healthy adult population. The first FAP score obtained in an automatic way is that provided by GAITRite Walkway System. The GAITRite system consists of a portable electronic mat embedded with pressure-activated sensors. The aim of this work was to develop the FAP score from data acquired by a classic stereophotogrammetric system, and to compare it with the one provided by GAITRite. Results underline as, during normal, slow, fast, small steps and foot-drop walking tests satisfactory results were ob-tained. Less satisfactory results were obtained in compromised walking, such as in fes-tinating or in spastic walking.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205335 Collegamento a IRIS

2013 Kinematic, dynamic and electromyographic analysis of functional reach in diabetic subjects
Editore: Università Politecnica delle Marche
Classificazione: 8 Tesi di dottorato
Abstract: La tesi prende in esame un particolare test clinico, il Functional Reach (FR) Test, utilizzato in clinica per l’identificazione del soggetto anziano a rischio di cadute ricorrenti. Come è mostrato in letteratura, tale test non è in grado di discriminare al meglio il soggetto anziano sano dall’individuo con problemi di equilibrio. Maggiori informazioni potrebbero essere ottenuto esaminando più nel dettaglio il comportamento cinematico, le strategie motorie utilizzate e i pattern elettromiografici messi in atto dal soggetto durante lo svolgimento del test. lo studio si compone di due parti: la prima si concentra sulla descrizione dei principali parametri cinematici che caratterizzano il task motorio e sull’individuazione delle strategie motorie usate durante il test. la seconda si focalizza sull’analisi elettromiografica di specifici muscoli del corpo per capire le tempistiche delle attivazioni muscolari durante il FR. Lo studio è stato condotto su soggetti diabetici e diabetici neuropatici. I risultati mostrano come simili valori di FR possono essere ottenuti da differenti strategie di movimento: per i diabetici non neuropatici il FR è maggiormente dovuto a una flessione del tronco nel piano sagittale, invece, per i diabetici neuropatici il movimento è accompagnato anche da una significativa rotazione del tronco nel piano sagittale. Quindi, durante il FR, anche se gran parte del movimento si verifica nel piano sagittale, si verificano anche movimenti rotazionali nel piano trasverso e coronale. Da un punto di vista elettromiografico, i due gruppi mostrano un comportamento simile, con un’attività anticipatoria del Tibiale Anteriore necessaria per muovere il centro di pressione all’indietro e dare luogo a un momento di dorsi-flessione della caviglia capace di sbilanciare il corpo in avanti. La differenza si registra nel timing di attivazione di questo muscolo, che per i diabetici neuropatici si attiva prima rispetto a quello che accade per i diabetici non neuropatici.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/242702 Collegamento a IRIS

2013 PATTERNS DI ATTIVAZIONE MUSCOLARE DURANTE IL FUNCTIONAL REACH TEST IN SOGGETTI DIABETICI
Menti Attive: La ricerca in Riabilitazione nelle Marche
Autore/i: E. Maranesi; R.A. Rabini; G. Ghetti; S. Fioretti
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/157904 Collegamento a IRIS

2012 ANALISI POSTURALE ED ELETTROMIOGRAFICA DI SOGGETTI PARKINSONIANI AFFETTI DA SINDROME DI PISA
Menti Attive: La ricerca in Riabilitazione nelle Marche
Autore/i: C. Calvaresi; S. Fioretti; E. Maranesi; G. Ghetti; O. Mercante
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/157902 Collegamento a IRIS

2012 COMPARISON OF sEMG ACTIVITY DURING REACHING MOVEMENTS
Proceedings XIII SIAMOC Congress
Autore/i: E. Maranesi; S. Fioretti
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Identification of elderly at risk of fall should be a top medical priority. The Functional Reach (FR) Test was proposed as a measure of balance able to identify elderly subjects at risk of recurrent falls. It was defined as the maximal distance one can reach forward beyond arm’s length while maintaining a fixed base of support in the standing position [1]. A similar motor task, the Standing Reach (SR), was proposed too and differs from FR just because the reach movement is performed with both arms extended. Both tests were used to examine dynamic balance and joint kinematics [2]. The aim of this work was to analyse the muscular activity of several muscles by surface electromyography (sEMG) during these motor tasks in order to highlight similarities and differences between the two motor performances, focusing on the estimate of muscle effort as evaluated by integrated surface EMG signals.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/157719 Collegamento a IRIS

2012 CARATTERIZZAZIONE CINEMATICA, DINAMICA ED ELETTROMIOGRAFICA DEL FUNCTIONAL REACH IN SOGGETTI PARKINSONIANI AFFETTI DA PISA SYNDROME
Menti Attive: La ricerca in Riabilitazione nelle Marche
Autore/i: G. Copponi; S. Fioretti; E. Maranesi; G. Ghetti; O. Mercante
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/157903 Collegamento a IRIS

2012 FUNCTIONAL REACH TEST: MOVEMENT STRATEGIES IN ELDERLY AND DIABETIC NEUROPATHIC SUBJECTS
ESB2012 Proceedings of the 18th Congress of the European Society of Biomechanics Lisbon, Portugal, 1–4 July 2012
Autore/i: Maranesi E.; Rabini R.A.; Fioretti S.
Editore: Elsevier
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Functional Reach (FR) is a simple clinical measure developed by Duncan et al. in 1990 to estimate the dynamic balance in the elderly at risk of recurrent falls. FR has been defined as the maximal distance one can reach forward beyond arm’s length while maintaining a fixed base of support in the standing position [Duncan, 1990]. Previous works showed as FR is not able to differentiate healthy elders from individuals with balance impairments [Wernick- Robinson, 1999]. More information can be obtained from this motor task if it can be described looking at the kinematic behaviour [Cavanaugh, 1999] and at the motor strategies employed. The purposes of this study is to describe the principal parameters that characterized the FR test in elderly and diabetic neuropathic subjects, and to investigate the presence of different movement strategies used by these two categories of subjects.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/77749 Collegamento a IRIS

2010 Chaotic behaviour of posturographic signals in de-novo Parknson’s patients
Proceedings of XI SIAMOC Congress
Autore/i: S. FIORETTI; LADISLAO L; SAVINI M; MARANESI E; GUIDI M
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/46349 Collegamento a IRIS


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