Abstract

This study investigated the beneficial effects of the utilization of mechanical advantage (MA) of finger tangential forces during the moment production. Subjects produced the resistive moment of force against the external torque while the moment arms of the tangential forces were systematically changed. We observed a relatively large contribution to the net moment by the tangential forces with the increased moment arms, whereas the vector sum of normal and tangential forces decreased. The indices of multi-finger coordination for the stabilization of the moment of forces and force direction increased with the moment arms. The current results provide evidence that the utilization of MA is associated with both the efficiency of force production and the stabilization of performance variables.

摘要

本研究调查了在力矩产生过程中利用手指切向力的机械优势 (MA) 的有益效果。受试者产生抵抗外部扭矩的阻力力矩，同时系统地改变切向力的力矩臂。我们观察到，随着力矩臂的增加，切向力对净力矩的贡献相对较大，而法向力和切向力的矢量和却减少了。用于稳定力矩和力方向的多指协调指数随着力臂的增加而增加。目前的结果提供证据表明 MA 的利用与力量产生的效率和性能变量的稳定性有关。