Dynamic Characteristics of Support Leg Muscles Based on Dynamics Conversion Ratios and Muscle Relative Loads during Constant Pace Running Motion

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  • NAKAYA Seigo
    Institute of Sport Science, ASICS Corporation Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • KOIKE Sekiya
    Faculty of Health and Sport Sciences, University of Tsukuba

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  • 筋張力の動力学的変換率および発揮負担度からみた定速走における 支持脚筋群の動的特徴
  • スジバリリョク ノ ドウリキガクテキ ヘンカンリツ オヨビ ハッキ フタンド カラ ミタ テイソクソウ ニ オケル シジ キャクキングン ノ ドウテキ トクチョウ

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Abstract

The purpose of this study is to investigate dynamic characteristics of the support leg muscles by using two types of indices, dynamic conversion ratio and muscle relative load, in a constant pace running. The dynamic conversion ratio of individual muscle is defined as the individual muscle force contribution, which is standardized by the magnitude of muscle force, to the generation of the whole-body inertia force, where the contribution is calculated from a dynamics analysis utilizing the equation of the whole-body motion. The muscle relative load is defined as the ratio of the actual muscle force to the muscle force generating capacity, where the capacity is calculated as the muscle force with the maximum activation input based on Hill-type force-length-velocity relationships of the muscles. The results obtained from twelve heel strikers’ running motion at the speed of 3.3[m/s] indicated that (1) the dynamic conversion ratios of horizontal components were larger than those of vertical components among all the muscles, (2) muscle relative loads with eccentric muscle activities were larger than those with concentric muscle activities for the muscles whose force contribute braking, and (3) triceps surae showed largest muscle relative load among all the muscles, and soleus and gastrocnemius showed large conversion ratios in vertical and horizontal directions, respectively.

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