指爪用保護膜の足趾爪への塗布が連続ジャンプに及ぼす影響

抄録

The purpose of this study was to investigate the effect of nail protector to the sequential jump performance. It was obvious that putting the nail protector on to the nail prevents the nail bend in our previous studies. Although the protector prevents bending the nail, it was not clear that how it affects to the performance or why? It was not sufficient evidence so far. Therefore, the effects of putting the protector to the nail should be consider for improving the performance in sports activities. Five male subjects were performed sequential vertical jump under maximum effort. Vertical ground reaction force, biaxial strain of foot thumb nail and foot middle fingernail on both sides and 3-dimensional position of hip, knee, ankle, heel, toe were measured by force plate, biaxial strain gage and 3-D motion capture system simultaneously. From these data, floor contact time, jump height, knee angle during contact phase, strain of nails were calculated by each jump in order to consider the relationship between the nail protector and there elements. Finally, one subject who performed with different manner of jumping from the others shows the significant relationship between the nail protector and the performance, the contact time. It means that the contact period shows the significant shorter when the nail protector was put on the nail despite the jump heights did not show the significant difference. In other words, the subject could perform the same task with shorter time.