Article
Multidisciplinary Sciences
Dmitry Verniba, Vincenzo E. Di Bacco, William H. Gage
Summary: Balance-correcting responses are fast, accurate, and functionally-and directionally-specific. However, there remains a lack of clarity in the literature as to how balance-correcting responses are organized, perhaps due to use of various perturbation methods. This study investigated the differences in neuromuscular organization of balance-correcting responses induced with platform-translation (PLAT) and upper body cable-pull (PULL) methods.
Article
Physiology
Kunkun Zhao, Chuan He, Wentao Xiang, Yuxuan Zhou, Zhisheng Zhang, Jianqing Li, Alessandro Scano
Summary: This study investigated the alterations of muscle synergies in post-stroke patients during upper-limb movements. It found that stroke led to changes in synergy structure and increased variability. Four synergy coordination patterns were identified, providing insights into the neurophysiological mechanisms and motor control strategies in post-stroke patients.
FRONTIERS IN PHYSIOLOGY
(2023)
Review
Computer Science, Information Systems
Muhammad Al-Ayyad, Hamza Abu Owida, Roberto De Fazio, Bassam Al-Naami, Paolo Visconti
Summary: In recent years, there has been a growing trend towards science-supported medicine, which uses replicable results from comprehensive studies to assist clinical decision-making. This review focuses on the application of surface electromyography (sEMG) in rehabilitation and health monitoring systems, evaluating its technical specifications, including wearability.
Article
Biophysics
Urszula Czajkowska, Ewelina Swiatek-Najwer, Ludomir Jankowski
Summary: The aim of this study was to evaluate muscle activation levels during different phases of the rowing cycle and compare the muscle engagement between professional and inexperienced rowers, as well as among different rowers at different speeds. The results showed that the muscle activation pattern during rowing is predictable, and there is a difference in muscle activation pattern between professional and amateur rowers. Additionally, the EMG signal was only correlated with force recorded by the strain gauge in experienced rowers.
ACTA OF BIOENGINEERING AND BIOMECHANICS
(2023)
Article
Engineering, Biomedical
Craig G. Mcdonald, Benjamin J. Fregly, Marcia K. O'Malley
Summary: Changes in muscle synergies can be correlated to functional changes resulting from neurological injury, serving as an indicator of motor impairment. Using a rehabilitation robot to constrain limb movements during training may not alter a subject's muscle synergies, as suggested by preliminary results.
IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING
(2021)
Article
Engineering, Biomedical
Marco Ghislieri, Giacinto Luigi Cerone, Marco Knaflitz, Valentina Agostini
Summary: The study introduces a LSTM-based muscle activity detection method, which was validated through simulated and real sEMG signals, demonstrating its excellent performance in recognizing and distinguishing muscle activity from background noise.
JOURNAL OF NEUROENGINEERING AND REHABILITATION
(2021)
Article
Geriatrics & Gerontology
Paulo Cezar Rocha dos Santos, Claudine J. C. Lamoth, Lilian Teresa Bucken Gobbi, Inge Zijdewind, Fabio Augusto Barbieri, Tibor Hortobagyi
Summary: The study compared muscle activation patterns of older and younger adults during repetitive sit-to-stand tasks, finding that older adults activated certain muscles more, earlier, and for longer duration. Despite completing fewer STS trials, older adults reported similar perceived exertion levels as younger adults. Maximum voluntary isometric knee extension force decreased at the end of the task, with similar declines in muscle activation levels across different age groups.
FRONTIERS IN AGING NEUROSCIENCE
(2021)
Article
Multidisciplinary Sciences
Korine A. Ohiri, Connor O. Pyles, Leslie H. Hamilton, Megan M. Baker, Matthew T. McGuire, Eric Q. Nguyen, Luke E. Osborn, Katelyn M. Rossick, Emil G. McDowell, Leah M. Strohsnitter, Luke J. Currano
Summary: This article presents a novel design for an e-textile based sEMG suit, which utilizes stretchable conductive textiles as electrodes and interconnects. The fabrication process is cost effective and can be done in a typical research environment. The suit provides comparable sEMG signal quality to traditional adhesive electrodes, but with improved comfort and reusability. The embedded electronics allow for signal conditioning and processing to estimate joint movements. The approach is also applicable to other electrophysiological sensors.
SCIENTIFIC REPORTS
(2022)
Article
Biotechnology & Applied Microbiology
Geng Li, Mohammad S. Shourijeh, Di Ao, Carolynn Patten, Benjamin J. Fregly
Summary: Muscle co-contractions can enhance stability and accuracy during limb movement but come with higher energy cost. This study investigated the feasibility of using two common Co-Contraction Index (CCI) formulations to approximate lower limb joint stiffness trends during gait. The correlations between CCI formulations and joint stiffness were found to be highly influenced by methodological choices in CCI computation.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2021)
Article
Biology
M. Janneke Schwaner, David C. Lin, Craig P. McGowan
Summary: The study on jumping by kangaroo rats showed that muscles in the knee and ankle joints increased their shortening and activity with higher jumps. Compared to the knee joint, muscles in the ankle joint were more efficient in extending the shortening velocity, leading to increased power output.
JOURNAL OF EXPERIMENTAL BIOLOGY
(2021)
Article
Engineering, Biomedical
Weihai Chen, Mingxing Lyu, Xilun Ding, Jianhua Wang, Jianbin Zhang
Summary: This paper presents an EMG-based gait pattern adaptation method that allows subjects to control a robotic exoskeleton for gait rehabilitation. The results show that the subjects were able to change the gait pattern of the exoskeleton using EMG signals and achieved the adaptation goals within a short period of time. This method enables subjects to actively participate in the rehabilitation training.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2023)
Review
Biotechnology & Applied Microbiology
Xiao Hou, Jingmin Liu, Kaixiang Weng, Lisa Griffin, Laura A. Rice, Yih-Kuen Jan
Summary: This study found that compression and LEDT have a significant effect on reducing muscle fatigue, and compression, active recovery, and cooling have a significant effect on reducing muscle fatigue when applied during exercise, but not after exercise.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2021)
Article
Computer Science, Artificial Intelligence
Chao Zhang, Ji Zou, Zhongjing Ma
Summary: This study explores the identification and analysis of limb rehabilitation signal based on wavelet transform, proposing a limb EMG pattern recognition method and utilizing support vector machine to evaluate the rehabilitation status of patients. Experimental results demonstrate the effectiveness of the proposed method in noise removal and EMG signal recognition.
TRAITEMENT DU SIGNAL
(2021)
Article
Neurosciences
Heesu Park, Sungmin Han, Joohwan Sung, Soree Hwang, Inchan Youn, Seung-Jong Kim
Summary: This study investigates the use of muscle synergy features to classify gait events more accurately and robustly compared to traditional features. EMG signals from four muscles in each lower extremity were measured using wireless electromyography sensors during walking. Results show that muscle synergy features have better classification accuracy, supporting the hypothesis that muscle synergy enables accurate gait phase classification.
FRONTIERS IN HUMAN NEUROSCIENCE
(2023)
Article
Sport Sciences
Josef Viellehner, Wolfgang Potthast
Summary: Vibration affects cycling performance by influencing pelvic position, upper body posture, and muscle activation. While lower extremity kinematics remain unchanged, vibration leads to increased pelvic rotation, upper body lean, and elbow flexion. Vibration significantly increases muscle activation in both lower extremities and upper body muscles such as the shoulder muscles. Additionally, knee and ankle flexors and extensors show increased co-contraction with vibration.
JOURNAL OF SPORTS SCIENCES
(2022)
Article
Anatomy & Morphology
Jeroen Aeles, Bart Bolsterlee, Nicole Y. Kelp, Taylor J. M. Dick, Francois Hug
Summary: This study developed an approach to quantify muscle fibre lengths in different muscle regions using diffusion tensor imaging and MRI. The research found substantial variability in fibre lengths between different regions within the same muscle and across individuals, supporting the use of subject-specific measurements when evaluating muscle function. The study also did not find significant differences in muscle fibre lengths between sexes, age groups, and muscles at the group level.
JOURNAL OF ANATOMY
(2022)
Article
Engineering, Biomedical
Iris Sachet, Niels Peter Brochner Nygaard, Gael Guilhem, Francois Hug, Sylvain Dorel
Summary: This study aimed to determine the relationship between lower-limb muscle strength capacity and torque generation in sprint cycling for male and female world-class cyclists. The results showed that isokinetic torques had stronger correlations with cycling torque than isometric torques, regardless of body position. In males, knee extension and hip flexion torques were key predictors of cycling torque, while in females, knee extension and hip flexion torques accounted for the majority of the variance in cycling torque.
SPORTS BIOMECHANICS
(2023)
Article
Neurosciences
Francois Hug, Simon Avrillon, Aurelie Sarcher, Alessandro Del Vecchio, Dario Farina
Summary: This study used graph theory to extract networks of motor neurons based on their correlated activity and identified the existence of common inputs among the motor neurons. The findings suggest that movements are controlled through small groups of motor neurons with common inputs, which do not necessarily correspond to muscle anatomy. This research provides a new neural framework for understanding the structure of common inputs to motor neurons.
JOURNAL OF PHYSIOLOGY-LONDON
(2023)
Article
Physiology
Jeroen Aeles, Aurelie Sarcher, Francois Hug
Summary: This study investigated the anatomical structure and functional role of the human soleus muscle. It was found that the common synaptic input between motor units innervating the medial and lateral posterior soleus compartments was not different from that within each individual compartment, which contradicts previous findings in finger muscles.
JOURNAL OF APPLIED PHYSIOLOGY
(2023)
Article
Neurosciences
Eduardo Martinez-Valdes, Roger M. Enoka, Ales Holobar, Kevin McGill, Dario Farina, Manuela Besomi, Francois Hug, Deborah Falla, Richard G. Carson, Edward A. Clancy, Catherine Disselhorst-Klug, Jaap H. van Dieen, Kylie Tucker, Simon Gandevia, Madeleine Lowery, Karen Sogaard, Thor Besier, Roberto Merletti, Matthew C. Kiernan, John C. Rothwell, Eric Perreault, Paul W. Hodges
Summary: The analysis of single motor unit (SMU) activity is crucial for understanding the neural strategies controlling muscle force. Traditionally, this analysis has been done invasively through intramuscular electromyography (EMG), but recent advances in signal processing techniques have enabled the identification of SMU activity in high-density surface electromyography (HDsEMG) recordings.
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
(2023)
Article
Engineering, Biomedical
Yue Wen, Sangjoon J. Kim, Simon Avrillon, Jackson T. Levine, Francois Hug, Jose L. Pons
Summary: In this study, a deep convolutional neural network (CNN) framework was proposed for neural drive estimation. The deep CNN can be applied without retraining to different muscles, sessions, and participants, showing potential for neural-machine interfaces.
JOURNAL OF NEURAL ENGINEERING
(2023)
Review
Neurosciences
Francois Hug, Simon Avrillon, Jaime Ibanez, Dario Farina
Summary: This review proposes a new conceptual framework for the neural control of movement, which combines the concepts of common input to motor neurons and modular control, while considering the constraints imposed by recruitment order. The article analyzes various scales of motor control and offers a unified approach to explain apparently divergent observations.
JOURNAL OF PHYSIOLOGY-LONDON
(2023)
Article
Physiology
Louise Tier, Sauro E. Salomoni, Francois Hug, Manuela Besomi, Paul W. Hodges
Summary: The aim of this study was to investigate the coordination strategies between back muscles during a tightly constrained isometric trunk extension task. The results showed substantial variations in coordination within and between individuals, and changes in coordination after brief exposure to muscle activation feedback. These findings highlight the highly flexible control of back muscles.
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
(2023)
Article
Physiology
Raphael Hamard, Jeroen Aeles, Simon Avrillon, Taylor J. M. Dick, Francois Hug
Summary: This study aimed to investigate whether the neural control of the biarticular gastrocnemius medialis (GM) and lateralis (GL) muscles is joint-specific. The results showed that there was no difference in the distribution of EMG amplitude and motor unit activity between knee flexion and ankle plantar flexion tasks. The level of common synaptic input between GM and GL motor units was also similar across the two tasks. These findings suggest that the neural control of the GM and GL muscles is similar irrespective of the joint action.
JOURNAL OF APPLIED PHYSIOLOGY
(2023)
Article
Physiology
Nicole Y. Kelp, Christofer J. Clemente, Kylie Tucker, Francois Hug, Sabrina Pinel, Taylor J. M. Dick
Summary: Muscle contraction causes bulging and shape changes, which are influenced by internal muscle properties and contractile forces. The internal muscle properties play an important role in shaping and gearing, especially during high-force contractions.
JOURNAL OF APPLIED PHYSIOLOGY
(2023)
Article
Neurosciences
Alessandro Del Vecchio, Carina Marconi Germer, Thomas M. Kinfe, Stefano Nuccio, Francois Hug, Bjoern Eskofier, Dario Farina, Roger M. Enoka
Summary: The purpose of this study was to identify the low-dimensional latent components, called motor unit modes, underlying the discharge rates of motor units in knee extensors and hand muscles during submaximal isometric contractions. Factor analysis identified two independent motor unit modes that captured most of the covariance of the motor unit discharge rates. The distribution of motor unit modes was different between hand and knee muscles, with a continuous distribution found for the knee muscles.
JOURNAL OF NEUROSCIENCE
(2023)
Article
Orthopedics
Marion Crouzier, Francois Hug, Frances T. Sheehan, Natalie J. Collins, Kay Crossley, Kylie Tucker
Summary: This study aimed to determine whether there is a difference in the torque distribution between the vastus medialis and vastus lateralis in adolescents with and without patellofemoral pain. The results showed that there was no decreased contribution of the vastus medialis to knee extension torque in adolescents with patellofemoral pain compared to controls.
ORTHOPAEDIC JOURNAL OF SPORTS MEDICINE
(2023)
Article
Neurosciences
Jackson Levine, Simon Avrillon, Dario Farina, Francois Hug, Jose L. Pons
Summary: Recent studies suggest that the nervous system generates movements by controlling groups of motor neurons that do not always align with muscle anatomy. This study aimed to determine whether these motor neuron synergies are consistent across tasks with different mechanical constraints. The results show that principal component analysis and cross-correlation can accurately identify common inputs and separate motor neurons that receive or do not receive these inputs.
JOURNAL OF PHYSIOLOGY-LONDON
(2023)
Article
Engineering, Biomedical
Yue Wen, Sangjoon J. Kim, Simon Avrillon, Jackson T. Levine, Francois Hug, Jose L. Pons
Summary: This study proposes a novel approach using a deep convolutional neural network to estimate the neural drive. The deep CNN can identify the cumulative spike train through general features of motor unit action potentials, allowing for generalization across different contraction tasks. The results show that the deep CNN provides accurate estimations of the cumulative spike train with low root-mean-square error.
IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING
(2022)
Article
Neurosciences
Francois Hug, Simon Avrillon, Aurelie Sarcher, Alessandro Del Vecchio, Dario Farina
Summary: This study investigates the control mechanism of muscle movement using a data-driven approach based on graph theory. The researchers found that motor neurons share common inputs and there is a partial mismatch between motor neuron groups and muscle anatomy.
JOURNAL OF PHYSIOLOGY-LONDON
(2022)