Knee stiffness is a major determinant of leg stiffness during maximal hopping |
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| Authors: | Hiroaki Hobara Tetsuro Muraoka Kohei Omuro Kouki Gomi Masanori Sakamoto Koh Inoue Kazuyuki Kanosue |
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| Institution: | 1. Graduate School of Human Sciences, Waseda University, Japan;2. Department of Rehabilitation for the Movement Functions, Research Institute, National Rehabilitation Center for Persons with Disabilities, 4-1, Namiki, Tokorozawa, Saitama 359-8555 Japan;3. Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, Tokorozawa, Saitama, Japan;4. Graduate School of Sport Sciences, Waseda University, Japan;5. Faculty of Sport Sciences, Waseda University, Japan;1. Japan Society for the Promotion of Science, Tokyo, Japan;2. Department of Kinesiology, University of Maryland, College Park, MD, USA;3. Department of Rehabilitation for the Movement Functions, Research Institute, National Rehabilitation Center for Persons with Disabilities, Saitama, Japan;4. Department of Mechanical Engineering, Kyung Hee University, Global Campus, Republic of Korea;1. Department of Sports Research, Japan Institute of Sports Sciences (JISS), Tokyo, Japan;2. Graduate School of Engineering and Science, Shibaura Institute of Technology, Saitama, Japan;3. Graduate School of Health Management, Keio University, Kanagawa, Japan;4. College of System Engineering and Science, Shibaura Institute of Technology, Saitama, Japan;5. Center for General Education, Tokyo Keizai University, Tokyo, Japan;6. Japan Society for the Promotion of Science, Tokyo, Japan;7. Faculty of Sport Sciences, Waseda University, Saitama, Japan |
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| Abstract: | Understanding stiffness of the lower extremities during human movement may provide important information for developing more effective training methods during sports activities. It has been reported that leg stiffness during submaximal hopping depends primarily on ankle stiffness, but the way stiffness is regulated in maximal hopping is unknown. The goal of this study was to examine the hypothesis that knee stiffness is a major determinant of leg stiffness during the maximal hopping. Ten well-trained male athletes performed two-legged hopping in place with a maximal effort. We determined leg and joint stiffness of the hip, knee, and ankle from kinetic and kinematic data. Knee stiffness was significantly higher than ankle and hip stiffness. Further, the regression model revealed that only knee stiffness was significantly correlated with leg stiffness. The results of the present study suggest that the knee stiffness, rather than those of the ankle or hip, is the major determinant of leg stiffness during maximal hopping. |
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