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Tohru Kiryu - One of the best experts on this subject based on the ideXlab platform.
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influence of Muscular Fatigue on skiing performance during parallel turns
International Conference of the IEEE Engineering in Medicine and Biology Society, 2011Co-Authors: Tohru Kiryu, Toshio Murayama, Yukihiko UshiyamaAbstract:Muscular Fatigue and muscle-activation patterns during a skiing demonstration (down a coarse around 4000 m long) was evaluated. Nine subjects participated in skiing trials and pre-training with a squat exercise. Surface electromyogram (SEMG) signals from the agonist and antagonist muscles around the knee at certain knee-joint angles were recorded. The SEMG signals showed that experienced skiers maintained their posture regardless of muscle Fatigue by means of sustained muscle contractions in accordance with the change in inclination of the slope. In contrast, intermediate skiers did not maintain their posture (because of muscle Fatigue) and distributed their strength over muscles to co-contract with each other. It is concluded from this result that the influence of muscle Fatigue on skiing performance is related to skill level.1
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EMBC - Influence of Muscular Fatigue on skiing performance during parallel turns
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Inte, 2011Co-Authors: Tohru Kiryu, Toshio Murayama, Yukihiko UshiyamaAbstract:Muscular Fatigue and muscle-activation patterns during a skiing demonstration (down a coarse around 4000 m long) was evaluated. Nine subjects participated in skiing trials and pre-training with a squat exercise. Surface electromyogram (SEMG) signals from the agonist and antagonist muscles around the knee at certain knee-joint angles were recorded. The SEMG signals showed that experienced skiers maintained their posture regardless of muscle Fatigue by means of sustained muscle contractions in accordance with the change in inclination of the slope. In contrast, intermediate skiers did not maintain their posture (because of muscle Fatigue) and distributed their strength over muscles to co-contract with each other. It is concluded from this result that the influence of muscle Fatigue on skiing performance is related to skill level.1
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A Ubiquitous Wearable Unit for Controlling Muscular Fatigue During Cycling Exercise Sessions
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Inte, 2007Co-Authors: Tohru Kiryu, K. YamashitaAbstract:For health promotion and motor rehabilitation, controlling Muscular Fatigue on-site is important during exercise sessions. We have developed a ubiquitous wearable unit with a Linux board and tried to apply it to the control of a torque-assisted bicycle with a biosignal-based fuzzy system designed for a cycle ergometer. The results showed that an appropriate design for the cycle ergometor (indoor exercise) would be sufficiently applicable for the torque-assisted bicycle (outdoor exercise) in terms of heart rate, but was not sufficient in terms of Muscular Fatigue. It needs more detailed control for Muscular activity.
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A Muscular Fatigue index based on the relationships between superimposed M wave and preceding background activity
IEEE transactions on bio-medical engineering, 1998Co-Authors: Tohru Kiryu, M. Morishiata, H. Yamada, M. OkadaAbstract:A practical muscle Fatigue index is studied in this paper using the correlation between the instantaneous frequencies (IF's) of the superimposed M wave and the mean power frequency (MPF) of the preceding background activity. A superimposed M wave is an M wave elicited during a sustained contraction and was recently introduced for studying muscle Fatigue. The authors investigated the details of the distribution of a feature vector (mpf, if) in two-dimensional space. Their experimental results showed that MPF and IF's were closely correlated during the first phase of a short-term high-level sustained voluntary contraction and then became uncorrelated or sometimes showed negative correlation as Muscular Fatigue progressed. Combining the correlation coefficients and conventional myoelectric (ME) parameters, such as the MPF and the average rectified value of ME signals, the authors propose a fuzzy rule based Muscular Fatigue index that can be used for managing the inevitable variability among individual subjects collected as a group. Introducing fuzzy inference seemed effective, but further studies including detailed investigation of the level of voluntary effort, the muscle fiber type composition, and metabolic by-products will be needed to customize the membership functions and fuzzy rules more appropriately in each practical field.
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Multivariate analysis of Muscular Fatigue during bicycle ergometer exercise
IEEE Transactions on Biomedical Engineering, 1997Co-Authors: Tohru Kiryu, K. Takahashi, K. OgawaAbstract:The purpose of this study is to estimate the endurance threshold in terms of Muscular Fatigue during bicycle ergometer exercise. The problems to be solved are induced by dynamic movement and the physiological variation of muscle activity: that is, the progression and impairment of muscle activity occur simultaneously. First of all, the authors used multichannel recordings of myoelectric (ME) signals to reduce the effect by the movement of a bipolar surface electrode relative to the innervation zones. Second, since even the different types of ME parameters contain redundant information on Muscular Fatigue, the authors used the principal component analysis (PCA) to represent the meaningful information by small dimensions. Moreover, the authors proposed a total evaluation pattern to discriminate Muscular Fatigue from progression of muscle force at a glance. The total evaluation pattern shows the proportion of first principal component, the components of the first eigenvector, and the correlation coefficients as a function of the work load. The assessment using the total evaluation pattern divided 8 subjects into 3 groups, whereas these subjects were not identified by a specific ME parameter.
Vincent Nougier - One of the best experts on this subject based on the ideXlab platform.
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Effects of a lower limb Muscular Fatigue on posture–movement interaction during a lower limb pointing task
European Journal of Applied Physiology, 2020Co-Authors: Marcelo Guimarães Silva, Lucas Struber, Olivier Daniel, Vincent NougierAbstract:Purpose The aim of the present study was to investigate the effects of Muscular Fatigue on the interaction between posture and movement during a lower limb pointing task. Methods Participants ( n = 16), aged 18–30 years, kicked a ball toward a target in four conditions of Fatigue: No Muscular Fatigue (NF), Fatigue in the kicking (FM) or postural limb (FP) alone, and Fatigue in both limbs (FMP). The mean amplitude and speed of the centre of foot pressure (CoP) and centre of mass (CoM) displacements were estimated through a force platform and an optoelectronic system, respectively. In addition, surface electromyography (EMG) of the biceps femoris, rectus femoris, medial gastrocnemius, and peroneus longus was recorded to investigate the anticipatory postural adjustments (APAs). Results Muscular Fatigue yielded a decreased kicking accuracy ( p
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Effects of a lower limb Muscular Fatigue on posture-movement interaction during a lower limb pointing task.
European journal of applied physiology, 2020Co-Authors: Marcelo Guimarães Silva, Lucas Struber, Olivier Daniel, Vincent NougierAbstract:PURPOSE The aim of the present study was to investigate the effects of Muscular Fatigue on the interaction between posture and movement during a lower limb pointing task. METHODS Participants (n = 16), aged 18-30 years, kicked a ball toward a target in four conditions of Fatigue: No Muscular Fatigue (NF), Fatigue in the kicking (FM) or postural limb (FP) alone, and Fatigue in both limbs (FMP). The mean amplitude and speed of the centre of foot pressure (CoP) and centre of mass (CoM) displacements were estimated through a force platform and an optoelectronic system, respectively. In addition, surface electromyography (EMG) of the biceps femoris, rectus femoris, medial gastrocnemius, and peroneus longus was recorded to investigate the anticipatory postural adjustments (APAs). RESULTS Muscular Fatigue yielded a decreased kicking accuracy (p
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effects of a lower limb Muscular Fatigue on posture movement interaction during a lower limb pointing task
European Journal of Applied Physiology, 2020Co-Authors: Lucas Struber, Marcelo Guimarães Silva, Olivier Daniel, Vincent NougierAbstract:PURPOSE The aim of the present study was to investigate the effects of Muscular Fatigue on the interaction between posture and movement during a lower limb pointing task. METHODS Participants (n = 16), aged 18-30 years, kicked a ball toward a target in four conditions of Fatigue: No Muscular Fatigue (NF), Fatigue in the kicking (FM) or postural limb (FP) alone, and Fatigue in both limbs (FMP). The mean amplitude and speed of the centre of foot pressure (CoP) and centre of mass (CoM) displacements were estimated through a force platform and an optoelectronic system, respectively. In addition, surface electromyography (EMG) of the biceps femoris, rectus femoris, medial gastrocnemius, and peroneus longus was recorded to investigate the anticipatory postural adjustments (APAs). RESULTS Muscular Fatigue yielded a decreased kicking accuracy (p < 0.001) and an increased time to perform the movement (p < 0.001), mainly during the backswing motion. In addition, significant increases in the mean amplitude and speed of the CoP and CoM displacement were found in the anteroposterior (AP) and mediolateral (ML) axes (ps < 0.001), especially when both limbs were Fatigued. The EMG analysis confirmed that Fatigue modified the way APAs were generated. During Fatigue, postural muscle activity increased, but was delayed with respect to movement onset (ps < 0.001). This pattern of response was more consistent when both limbs were Fatigued (p < 0.001). CONCLUSION The present results suggested an additive effect of Fatigue and a functional adaptation and subsequent decrease in the overall variability of APAs, indicating that postural and motor processes are interdependent.
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Effect of light finger touch on postural sway after lower-limb Muscular Fatigue.
Archives of Physical Medicine and Rehabilitation, 2003Co-Authors: Nicolas Vuillerme, Vincent NougierAbstract:OBJECTIVE: To investigate whether a light finger touch can compensate for the increased postural sway induced by lower-limb Muscular Fatigue. DESIGN: Before-after trials. SETTING: General community. PARTICIPANTS: Nine healthy university students (mean age, 23.8+/-2.6y; mean body weight, 72.7+/-6.9 kg; mean height, 177.2+/-7.5 cm). INTERVENTIONS: Participants stood with their feet together and eyes closed. They were asked to sway as little as possible in 4 conditions: no Fatigue/no touch, no Fatigue/touch, Fatigue/no touch, and Fatigue/touch. Calf muscle Fatigue was induced by having participants stand on their toes until exhaustion. Touch conditions involved a gentle light touch with the right index finger on a nearby surface at waist height. MAIN OUTCOME MEASURES: Center of pressure displacements were recorded by using a force platform. RESULTS: Light finger touch resulted in decreased postural sway in the no-Fatigue and Fatigue conditions. Interestingly, this stabilizing effect was more accentuated in the Fatigue condition. CONCLUSIONS: Results suggest that the contribution of the haptic cues from the finger for regulating postural sway increases after Muscular Fatigue. These findings could have implications in clinical and rehabilitative areas.
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Perturbation of the postural control system induced by Muscular Fatigue.
Gait & posture, 2003Co-Authors: Philippe Corbeil, Jean-sébastien Blouin, François Bégin, Vincent Nougier, Normand TeasdaleAbstract:In this experiment, we induced Muscular Fatigue of ankle plantar-flexors to examine how it deteriorates the regulation of bipedal quiet upright standing. Postural stability was assessed in conditions with and without vision over 60 s period to examine not only classical postural variables (time- and frequency-domain analyses), but also structural variables (stabilogram-diffusion analysis). Muscular Fatigue was induced with repeated plantar-flexion of both legs. With Muscular Fatigue, subjects exhibited an increased postural sway (faster center of pressure (CP) velocity, and greater CP mean and median frequency) and a decreased long-term scaling exponent compared with the control conditions. The Fatigue conditions, however, did not modify the range of oscillations and the variability of the postural oscillations around the mean position of CP. The effects of Muscular Fatigue were similar with eyes open and eyes closed. These results suggest that Fatigue did induce some changes in the control mode of postural stability, but the detection/action capabilities of the sensorimotor system remained partly efficient when the ankle plantar-flexors were Fatigued. Furthermore, the decreased long-term scaling exponent observed with Fatigue suggests that the control of upright stance operates in a less stochastic and more antipersistent manner when Fatigue is present (i.e. past and future behaviors were more negatively correlated and thus more tightly regulated). Altogether, the present results suggest that, compared with the no-Fatigue conditions, Fatigue places higher demands on the postural control system by increasing the frequency of actions needed to regulate the upright stance.
Nicolas Vuillerme - One of the best experts on this subject based on the ideXlab platform.
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Degradation of cervical joint position sense following Muscular Fatigue in humans.
Spine, 2010Co-Authors: Nicolas Pinsault, Nicolas VuillermeAbstract:Study Design. Before and after intervention trials. Objective. To investigate the effect of cervical Muscular Fatigue on joint position sense. Summary of Background Data. Although Fatigue-related degradation of proprioceptive acuity at lower and upper limbs is well documented, to date no study has investigated whether Muscular Fatigue induced at the neck could modify joint position sense. Methods. A total of 9 young healthy adults were asked to perform the cervicocephalic relocation test to the neutral head position, that is, to relocate the head on the trunk, as accurately as possible, after full active cervical rotation to the left and right sides. This experimental task was executed in 2 conditions of No Fatigue and Fatigue of the scapula elevator muscles. Absolute and variable errors were used to assess the cervical joint repositioning accuracy and consistency, respectively. Results. Less accurate and less consistent repositioning performances were observed in Fatigue relative to No Fatigue condition, as indicated by increased absolute and variable errors, respectively. Conclusion. Results of the present experiment evidence that cervical joint position sense, assessed through the cervicocephalic relocation test to the neutral head position, is degraded by Muscular Fatigue.
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Postural control during quiet standing following cervical Muscular Fatigue: effects of changes in sensory inputs.
Neuroscience Letters, 2005Co-Authors: Nicolas Vuillerme, Nicolas Pinsault, Jacques VaillantAbstract:The purpose of the present experiment was to investigate the effects of cervical Muscular Fatigue on postural control during quiet standing under different conditions of reliability and/or availability of somatosensory inputs from the plantar soles and the ankles and visual information. To this aim, 14 young healthy adults were asked to sway as little as possible in three sensory conditions (No vision, No vision-Foam support and Vision) executed in two conditions of No Fatigue and Fatigue of the scapula elevator muscles. Centre of foot pressure (CoP) displacements were recorded using a force platform. Results showed that (1) the cervical Muscular Fatigue yielded increased CoP displacements in the absence of vision, (2) this effect was more accentuated when somatosensation was degraded by standing on a foam surface and (3) the availability of vision allowed the individuals to suppress this destabilising effect. On the whole, these findings not only stress the importance of intact cervical neuroMuscular function on postural control during quiet standing, but also suggest a reweigthing of sensory cues in balance control following cervical Muscular Fatigue by increasing the reliance on the somatosensory inputs from the plantar soles and the ankles and visual information.
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Effect of light finger touch on postural sway after lower-limb Muscular Fatigue.
Archives of Physical Medicine and Rehabilitation, 2003Co-Authors: Nicolas Vuillerme, Vincent NougierAbstract:OBJECTIVE: To investigate whether a light finger touch can compensate for the increased postural sway induced by lower-limb Muscular Fatigue. DESIGN: Before-after trials. SETTING: General community. PARTICIPANTS: Nine healthy university students (mean age, 23.8+/-2.6y; mean body weight, 72.7+/-6.9 kg; mean height, 177.2+/-7.5 cm). INTERVENTIONS: Participants stood with their feet together and eyes closed. They were asked to sway as little as possible in 4 conditions: no Fatigue/no touch, no Fatigue/touch, Fatigue/no touch, and Fatigue/touch. Calf muscle Fatigue was induced by having participants stand on their toes until exhaustion. Touch conditions involved a gentle light touch with the right index finger on a nearby surface at waist height. MAIN OUTCOME MEASURES: Center of pressure displacements were recorded by using a force platform. RESULTS: Light finger touch resulted in decreased postural sway in the no-Fatigue and Fatigue conditions. Interestingly, this stabilizing effect was more accentuated in the Fatigue condition. CONCLUSIONS: Results suggest that the contribution of the haptic cues from the finger for regulating postural sway increases after Muscular Fatigue. These findings could have implications in clinical and rehabilitative areas.
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Effect of light finger touch on postural sway after lower-limb Muscular Fatigue.
Archives of physical medicine and rehabilitation, 2003Co-Authors: Nicolas Vuillerme, Vincent NougierAbstract:Abstract Vuillerme N, Nougier V. Effect of light finger touch on postural sway after lower-limb Muscular Fatigue. Arch Phys Med Rehabil 2003;84:1560–3. Objective To investigate whether a light finger touch can compensate for the increased postural sway induced by lower-limb Muscular Fatigue. Design Before-after trials. Setting General community. Participants Nine healthy university students (mean age, 23.8±2.6y; mean body weight, 72.7±6.9kg; mean height, 177.2±7.5cm). Interventions Participants stood with their feet together and eyes closed. They were asked to sway as little as possible in 4 conditions: no Fatigue/no touch, no Fatigue/touch, Fatigue/no touch, and Fatigue/touch. Calf muscle Fatigue was induced by having participants stand on their toes until exhaustion. Touch conditions involved a gentle light touch with the right index finger on a nearby surface at waist height. Main Outcome Measure Center of pressure displacements were recorded by using a force platform. Results Light finger touch resulted in decreased postural sway in the no-Fatigue and Fatigue conditions. Interestingly, this stabilizing effect was more accentuated in the Fatigue condition. Conclusions Results suggest that the contribution of the haptic cues from the finger for regulating postural sway increases after Muscular Fatigue. These findings could have implications in clinical and rehabilitative areas.
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Can vision compensate for a lower limbs Muscular Fatigue for controlling posture in humans
Neuroscience letters, 2001Co-Authors: Nicolas Vuillerme, Vincent Nougier, Jean-michel PrieurAbstract:The purpose of the present experiment was to investigate the effect of vision on postural control following a lower limbs Muscular Fatigue. Ten adult males were asked to maintain a single leg upright posture as immobile as possible in two conditions of no-Fatigue and Fatigue of the calf muscles. This muscles Fatigue was achieved by standing on the toes until exhaustion. Within a trial, vision was suppressed or reinserted by eyes closure or opening. Center of foot pressure displacements were recorded using a force platform. Results showed that the availability of vision allowed the subjects to immediately cope with the destabilizing effect induced by Muscular Fatigue.
Huali Zuo - One of the best experts on this subject based on the ideXlab platform.
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Correction: Pulling strength, Muscular Fatigue, and prediction of maximum endurance time for simulated pulling tasks.
PloS one, 2018Co-Authors: Fan Tang, Huali ZuoAbstract:Truck pulling is one of the common manual materials handling tasks which contribute to musculoskeletal disorders. The maximum endurance time (MET) for two-handed truck pulling tasks has been rarely discussed in the literature. The objectives of this study were to explore the development of Muscular Fatigue when performing two-handed pulling task and to establish models to predict the MET. A simulated pallet truck pulling experiment was conducted. Sixteen healthy adults including eight females and eight males participated. The participants pulled a handle simulating that of a pallet truck using two hands until they could not pull any longer under two postures. The forces applied for females and males were 139.65 N and 170.03 N, respectively. The maximum voluntary contractions (MVC) of the pulling strength both before and after the simulated pull were measured. After each trial, both the MET and subjective ratings of Muscular Fatigue on body segments were recorded. The results showed that posture significantly affected MVC of pull both before and after the trial. It was found that foot/shank of the front leg had higher subjective ratings of Muscular Fatigue than the other body segments. The MET equations employing both power and logarithmic functions were developed to predict the MET of the two-handed pulling tasks. Predictive models established in this study may be used to assess the MET for two-handed pulling tasks.
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Pulling strength, Muscular Fatigue, and prediction of maximum endurance time for simulated pulling tasks.
PloS one, 2018Co-Authors: Fan Tang, Huali ZuoAbstract:Truck pulling is one of the common manual materials handling tasks which contribute to musculoskeletal disorders. The maximum endurance time (MET) for two-handed truck pulling tasks has been rarely discussed in the literature. The objectives of this study were to explore the development of Muscular Fatigue when performing two-handed pulling task and to establish models to predict the MET. A simulated pallet truck pulling experiment was conducted. Sixteen healthy adults including eight females and eight males participated. The participants pulled a handle simulating that of a pallet truck using two hands until they could not pull any longer under two postures. The forces applied for females and males were 139.65 N and 170.03 N, respectively. The maximum voluntary contractions (MVC) of the pulling strength both before and after the simulated pull were measured. After each trial, both the MET and subjective ratings of Muscular Fatigue on body segments were recorded. The results showed that posture significantly affected MVC of pull both before and after the trial. It was found that foot/shank of the front leg had higher subjective ratings of Muscular Fatigue than the other body segments. The MET equations employing both power and logarithmic functions were developed to predict the MET of the two-handed pulling tasks. Predictive models established in this study may be used to assess the MET for two-handed pulling tasks.
Stéphane Binczak - One of the best experts on this subject based on the ideXlab platform.
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NER - On the control of a Muscular force model including Muscular Fatigue
2015 7th International IEEE EMBS Conference on Neural Engineering (NER), 2015Co-Authors: Aurore Maillard, Maxime Yochum, Toufik Bakir, Stéphane BinczakAbstract:Electromyostimulation has been used for several decades by athletes or physiotherapists in order to create a Muscular reinforcement. However, the efficiency of electromyostimulation is limited by Muscular Fatigue and by induced pain. Currently, the systems of electromyostimulation do not adapt the stimulation parameters automatically by taking into account physiological parameters such as Muscular Fatigue. To adapt the stimulation parameters to Muscular responses and in order to optimize the rehabilitation sessions, a control of force using an indicator of Muscular Fatigue could be used. In this paper, we propose two ways to control the force by using a physiological model which includes the effects of Muscular Fatigue.
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Estimation of Muscular Fatigue under Electromyostimulation Using CWT
IEEE Transactions on Biomedical Engineering, 2012Co-Authors: Maxime Yochum, Romuald Lepers, Stéphane Binczak, Toufik BakirAbstract:The aims of this study are to investigate Muscular Fatigue and to propose a new Fatigue index based on the continuous wavelet transform (CWT) which is compared to the standard Fatigue indexes from literature. Fatigue indexes are all based on the electrical activity of muscles (electromyogram) acquired during an electrically stimulated contraction thanks to two modules (electromyostimulation + electromyography recording) that can analyze EMG signals in real time during electromyostimulation. The extracted parameters are compared with each other and their sensitivity to noise is studied. The effect of truncation of M waves is then investigated, enlightening the robustness of the index obtained using CWT.
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Truncation effects on Muscular Fatigue indexes based on M waves analysis
2012Co-Authors: Maxime Yochum, Toufik Bakir, Romuald Lepers, Stéphane BinczakAbstract:In this paper, we investigate Muscular Fatigue. We propose a new Fatigue index based on the continuous wavelet transform (CWT) and compare it with the standard Fatigue indexes from literature. Fatigue indexes are all based on the electrical activity of muscles (electromyogram) acquired during an electrically stimulated contraction (ES). The stimulator and electromyogram system, which were presented in a previous work, allows real-time analysis. The extracted Fatigue parameters are compared between each other and their sensitivity to noise is studied. The effect of truncation of M waves is then investigated, enlightening the robustness of the index obtained using CWT.
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EMBC - Truncation effects on Muscular Fatigue indexes based on M waves analysis
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Inte, 2012Co-Authors: Maxime Yochum, Toufik Bakir, Romuald Lepers, Stéphane BinczakAbstract:In this paper, we investigate Muscular Fatigue. We propose a new Fatigue index based on the continuous wavelet transform (CWT) and compare it with the standard Fatigue indexes from literature. Fatigue indexes are all based on the electrical activity of muscles (electromyogram) acquired during an electrically stimulated contraction (ES). The stimulator and electromyogram system, which were presented in a previous work, allows real-time analysis. The extracted Fatigue parameters are compared between each other and their sensitivity to noise is studied. The effect of truncation of M waves is then investigated, enlightening the robustness of the index obtained using CWT.
