Influences of load compliance during static contraction in sensorimotor integration - Position control task Vs. Force control task -

当一个人进行次最大等长收缩时，有两种不同的负荷类型，一种是产生恒定的力对抗刚性约束（力任务），另一种是保持位置对抗恒定负荷（位置任务）。在以前的研究报告中，次最大收缩的任务失败的时间是两倍长的力量任务相比，在位置的任务。在这项研究中，我们证明了位置任务引起更多的抑制效应的躯体感觉皮层相比，力的任务。位置任务中较大的门控效应可能意味着，在支持恒定负荷的同时保持食指位置的任务需要来自Ia组传入的更多本体感受信息，从而发生向心机制的增强门控。

When an individual performs a submaximal isometric contraction, there are two different load types either to produce a constant force against a rigid restraint (force task) or to maintain the position against a constant load (position task). In previous studies reported that the time to task failure for a submaximal contraction was twice as long in force task compared with in position task. In this study, we demonstrated that the position task causes more inhibitory effect on somatosensory cortex compared with the force task. Larger gating effect in the position task could imply that the task to maintain the position of the index finger while supporting a constant load requires more proprioceptive information from the group Ia afferents with which the enhanced gating of centripetal mechanism occurs.