Influence of locomotion speed on biomechanical subtask and muscle synergy |
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| Institution: | 1. Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA;2. Department of Neurology, Pennsylvania State University-Milton S. Hershey Medical Center, Hershey, PA 17033, USA;3. Department of Pharmacology, Pennsylvania State University-Milton S. Hershey Medical Center, Hershey, PA 17033, USA;4. Department of Radiology, Pennsylvania State University-Milton S. Hershey Medical Center, Hershey, PA 17033, USA;5. Department of Neurosurgery, Pennsylvania State University-Milton S. Hershey Medical Center, Hershey, PA 17033, USA;1. Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama, Japan;2. School of Health and Sport Sciences, Chukyo University, 101-2 Yagoto Honmachi, Showa-ku, Nagoya-shi, Aichi, Japan;3. Laboratory of Neurophysiology, Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto, Japan;1. Graduate School of Saitama Prefectural University, Graduate Course of Health and Social Services, 820 San-Nomiya, Koshigaya-shi, Saitama 343-8540, Japan;2. Department of Rehabilitation, Higashi Saitama General Hospital, 517-5, Yoshino, Satte-shi, Saitama 340-0153, Japan;3. Saitama Prefectural University, Department of Health and Social Services, Saitama, Japan;4. Ageo Central General Hospital, Saitama, Japan;1. Laboratory for Paediatric Motion Analysis and Biofeedback Rehabilitation, ALYN Paediatric and Adolescent Rehabilitation Research Centre (ALYN PARC), Jerusalem, Israel;2. Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands;3. Department of Rehabilitation Medicine, Amsterdam UMC, Amsterdam, Netherlands;4. Clinical Motion Analysis Laboratory, ALYN Paediatric and Adolescent Rehabilitation Centre, Jerusalem, Israel |
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| Abstract: | This paper investigates the relationship of biomechanical subtasks, and muscle synergies with various locomotion speeds. Ground reaction force (GRF) of eight healthy subjects is measured synchronously by force plates of treadmill at five different speeds ranging from 0.5 m/s to 1.5 m/s. Four basic biomechanical subtasks, body support, propulsion, swing, and heel strike preparation, are identified according to GRF. Meanwhile, electromyography (EMG) data, used to extract muscle synergies, are collected from lower limb muscles. EMG signals are segmented periodically based on GRF with the heel strike as the split points. Variability accounted for (VAF) is applied to determine the number of muscle synergies. We find that four muscle synergies can be extracted in all five situations by non-negative matrix factorization (NMF). Furthermore, the four muscle synergies and biomechanical subtasks keep invariant as the walking speed changes. |
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| Keywords: | Locomotion Muscle synergy Walking speed Biomechanical subtask Electromyography |
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