Journal of the Society of Biomechanisms
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Volume 38, Issue 3
Displaying 1-9 of 9 articles from this issue
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  • Dynamic Characteristics of Support Leg Muscles Based on Dynamics Conversion Ratios and Muscle Relative Loads during Constant Pace Running Motion
    Seigo NAKAYA, Sekiya KOIKE
    2014 Volume 38 Issue 3 Pages 207-217
    Published: 2014
    Released on J-STAGE: April 16, 2016
    DOIhttps://doi.org/10.3951/sobim.38.207
    JOURNAL FREE ACCESS
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    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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