Relationships between muscle strength and multi-channel surface EMG parameters in eighty-eight elderly |
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Authors: | Kohei Watanabe Motoki Kouzaki Madoka Ogawa Hiroshi Akima Toshio Moritani |
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Affiliation: | 1.Laboratory of Neuromuscular Biomechanics, School of International Liberal Studies,Chukyo University,Nagoya,Japan;2.Laboratory of Neurophysiology, Graduate School of Human and Environmental Studies,Kyoto University,Kyoto,Japan;3.Graduate School of Education and Human Development,Nagoya University,Nagoya,Japan;4.Japan Society for the Promotion of Science,Tokyo,Japan;5.Research Center of Health, Physical Fitness & Sports, Nagoya University, Japan raduate School of Education and Human Development,Nagoya University,Nagoya,Japan;6.Faculty of Sociology,Kyoto Sangyo University,Kyoto,Japan;7.School of Health and Sports Sciences,Chukyo University,Nagoya,Japan |
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Abstract: | BackgroundSince age-related muscle strength loss cannot be explained solely by muscle atrophy, other determinants would also contribute to muscle strength in elderly. The present study aimed to clarify contribution of neuromuscular activation pattern to muscle strength in elderly group. From 88 elderlies (age: 61~?83 years), multi-channel surface electromyography (EMG) of the vastus lateralis muscle was recorded with two-dimensional 64 electrodes during isometric submaximal ramp-up knee extension to assess neuromuscular activation pattern. Correlation analysis and stepwise regression analysis were performed between muscle strength and the parameters for signal amplitude and spatial distribution pattern, i.e., root mean square (RMS), correlation coefficient, and modified entropy of multi-channel surface EMG.ResultsThere was a significant correlation between muscle strength and RMS (r =?0.361, p =?0.001) in the elderly. Muscle thickness (r =?0.519, p 0.001), RMS (r =?0.288, p?=?0.001), and normalized RMS (r =?0.177, p =?0.047) were selected as major determinants of muscle strength in stepwise regression analysis (r?=?0.664 in the selected model).ConclusionThese results suggest that inter-individual difference in muscle strength in elderly can be partly explained by surface EMG amplitude. We concluded that neuromuscular activation pattern is also major determinants of muscle strength on elderly in addition to indicator of muscle volume. |
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