Real time relationship between individual finger force and grip exertion on distal phalanges in linear force following tasks.
Real time relationship between individual finger force and grip exertion on distal phalanges in linear force following tasks.
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DOI：
10.1016/j.apergo.2017.12.012
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发表时间：
2018-05
影响因子：
3.2
通讯作者：
Shijian Luo;Ge Shu;Yan Gong
中科院分区：
文献类型：
--
作者：
Shijian Luo;Ge Shu;Yan Gong
抓握任务中的单个手指力（FF）是康复工程和机械手精确控制中的重要问题，因为任何手指的障碍都会影响抓握力（GF）的稳定性或准确性。为了了解动态握力任务中各手指的功能，设计了一个无拇指的四个手指的GF跟随实验。本研究在动态GF跟随任务中获得了四个来自远端指骨的具有圆柱形手柄的个体FF。10名手大小相似的健康男性受试者在不同的次最大随意收缩（SMVC）水平下参与四指线性GF跟随任务。随后计算和分析了总GF、个体FF、手指力贡献和跟随误差。统计结果表明：（1）低%MVC时GF的准确性和稳定性显著高于高SMVC时：（2）低SMVC时，手指增加GF的能力强于减少GF的能力，而高SMVC时，手指增加GF的能力强于减少GF的能力;（3）当靶波（TW）变化时，四指均强烈参与施力，而当TW保持稳定时，小指的参与度显著降低;（4）示、无名指在GF的调控中具有互补关系，起着至关重要的作用。中指和小指对力的控制和调节影响较小。总之，每个手指在GF跟随任务中具有不同的功能。这些研究结果可用于手指损伤康复的评估和精确控制的算法。
Individual finger force (FF) in a grip task is a vital concern in rehabilitation engineering and precise control of manipulators because disorders in any of the fingers will affect the stability or accuracy of the grip force (GF). To understand the functions of each finger in a dynamic grip exertion task, a GF following experiment with four individual fingers without thumb was designed. This study obtained four individual FFs from the distal phalanges with a cylindrical handle in dynamic GF following tasks. Ten healthy male subjects with similar hand sizes participated in the four-finger linear GF following tasks at different submaximal voluntary contraction (SMVC) levels. The total GF, individual FF, finger force contribution, and following error were subsequently calculated and analyzed. The statistics indicated the following: 1) the accuracy and stability of GF at low %MVC were significantly higher than those at high SMVC; 2) at low SMVC, the ability of the fingers to increase the GF was better than the ability to reduce it, but it was contrary at high SMVC; 3) when the target wave (TW) was changing, all four fingers strongly participated in the force exertion, but the participation of the little finger decreased significantly when TW remained stable; 4) the index finger and ring finger had a complementary relationship and played a vital role in the adjustment and control of GF. The middle finger and little finger had a minor influence on the force control and adjustment. In conclusion, each of the fingers had different functions in a GF following task. These findings can be used in the assessment of finger injury rehabilitation and for algorithms of precise control.