着地動作における下肢の役割

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Most of physical movements are composed by a process in onset of movement, duration of movement, and landing of lower extremities. Motion in physics is determined its ending by initial velocity and angle. However, in the living body many informations act to control and to protect the body through the process of motion. Thus, lower extremities are seemed to play a role of shock absorber in various exercise. This study was designated to investigate this control mechanism of lower extremities in fall movement by various experimental conditions. The following results were observed : 1. Foot landing and releasing in left and right foot during repetition of jumping movements were not concomitant. 2. E.m.g. of leg muscles (gastrocnemius, rectus femoris, anterior tibialis and vastus lateralis) were also differed between foot releasing and landing. 3. During fall, ankle and knee joint were extended at once but about 20-30 msec before foot landing knee joint was flexed. 4. Tension development at landing had two components; one was transient reverse tension development and the other was maximum impact tension development. 5. Safety fall could except the transient tension development and delayed the appearance of maximum tension development. But in the fall from over 78cm height it could not cover them. 6. This first component in tension development related with instant flexion of ankle joint and this appearance seems to weak impact tension and to decrease maximum tension development at landing.
東海大学の論文

着地動作における下肢の役割

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