Simmons R W, Richardson C
Department of Physical Education, San Diego State University, CA 92182.
Exp Brain Res. 1993;92(3):524-7. doi: 10.1007/BF00229042.
Ten right-hand-dominant subjects completed a series of unsighted, goal-directed, arm flexion movements under three different mechanical loading conditions: an inertial load, an elastic spring load, and a stretched-spring load. Subjects completed a series of inertial load training trials followed by random application of one of the three loads. Three time intervals of the first agonist pulse were considered for analysis: the time from initiation of agonist activity to the onset of movement, the interval from movement initiation to the end of the agonist pulse, and the duration of the entire agonist pulse. Analyses revealed that load type did not affect the duration of any of the time intervals studied. The results suggest the presence of a regulatory control process which temporally organizes an invariant agonist pulse even when the movement is perturbed by external loads possessing different mechanical characteristics.
十名惯用右手的受试者在三种不同的机械负荷条件下完成了一系列蒙眼的、目标导向的手臂弯曲动作：惯性负荷、弹性弹簧负荷和拉伸弹簧负荷。受试者先完成一系列惯性负荷训练试验，然后随机施加三种负荷中的一种。分析时考虑了第一次主动肌脉冲的三个时间间隔：从主动肌活动开始到动作开始的时间、从动作开始到主动肌脉冲结束的间隔以及整个主动肌脉冲的持续时间。分析表明，负荷类型不影响所研究的任何时间间隔的持续时间。结果表明存在一种调节控制过程，即使运动受到具有不同机械特性的外部负荷干扰，该过程也能在时间上组织一个不变的主动肌脉冲。
