踏み台運動における抗重力筋のエキセントリック収縮局面の検討

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It has been demonstrated a possibility that the eccentric contraction in antigravity muscle is effective muscle training to induce recruitment of fast-twitch muscle fibers. In this study, we examined some eccentric and concentric phases in monoarticular and antigravity muscle, gluteus major (GM), vastus lateralis (VL) and soleus (Sol) muscles, during step up/down exercise and suggested a method for enhancing eccentric contraction activity in these muscles. Healthy male adult (n=8) were subjected to up/down exercise using a box (24cm height) with a step/1.2 sec pace. Surface EMG activities of the muscles and joint angle changes in hip, knee and ankle joints of sustained leg on the box were recorded simultaneously by motion analyze system (1200Hz in EMG and 120Hz in Video). Concentric and eccentric contraction phases were identified by the EMG recording and joint angle change, and an integrated EMG (iEMG) of each contraction phase was compared between forward and backward steps. The mean value of iEMG in GM muscle showed significantly higher in eccentric contraction phase during backward step down than forward step down. In both of VL and Sol muscles, the mean value of iEMG showed significantly higher in concentric contraction phase during backward step up than forward step up. In addition, the mean value of iEMG in Sol muscle showed significantly higher in eccentric contraction phase during backward step up than forward step up. From these results, the most effective exercise pattern to induce eccentric contraction was suggested as follows; forward step up and backward step down for GM muscle; backward step up and forward step down for VL and Sol muscles.
日本運動生理学会の論文
2009-09-30

踏み台運動における抗重力筋のエキセントリック収縮局面の検討

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