Depth Jumpに関する実験的研究

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The purpose of this study was to investigate the optimal negative load in depth jump. Twenty-nine male subjects performed depth jump from five different heights onto the force platform. The jump height was measured by leap-meter. We analized the each of ground reaction force, and obtain the following results. (1) A jumping performance increased when the box height increased from 20cm to 60cm (Fig. 3). (2) Subjects showed the tendency that performed the highest jump droping from the box with N/P about 1.10 (Fig. 4,5). (3) Coefficients of correlation between musclar strength of leg extensor (F/W) and SJ, DJ were γ=0.60 (p<0.01), γ=0.50 (p<0.01). (4) All of groups showed the tendency that a contact time increased when the box height increased from 20cm up to 100cm (Fig. 8). (5) Angle of knee joints as the most lowest position decreased when the box height was increased from 20cm up to 100cm, especially Group (C) (strength : +), showed this tendency remarcably (Fig. 12). (6) The tendency that Group (A) (strength : -) performed jump bending the knee joints shallow by short contact time, and Group (C) jumped bending the knee joints deep by long contact time, was recognized (Fig. 8,12). (7) Group (A) showed longer contact time made higher jumping performance (Fig. 9), though Group (C) showed shorter contact time made higher jumping performance (Fig. 11). Only Group (B) (strength : ±) showed a no clear relation (Fig. 10). The most suitable contact time to perform the best jumping ability efficiently for Group (A) was between 0.5 and 0.6 second, one for Group (C) was about 0.6 second, though one for Group (B) was not recognized. (8) The difference of jumping patterns among 3 groups, was recognized, though the most effective its pattern was not recognized (Table. 2).
東海大学の論文
1987-03-30

Depth Jumpに関する実験的研究

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