Modulation of anticipatory postural adjustments associated with unloading perturbation: effect of characteristics of a motor action.
Modulation of anticipatory postural adjustments associated with unloading perturbation: effect of characteristics of a motor action.
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与卸载扰动相关的预期姿势调整的调节：运动动作特征的影响。
DOI：
10.1007/s00221-006-0725-y
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发表时间：
2007
影响因子：
2
通讯作者：
Aruin,Alexander
中科院分区：
文献类型：
--
作者：
Shiratori,Takako;Aruin,Alexander
这项研究的目的是确定运动动作的特征是否会影响预期姿势调整(APA)。站立的受试者双手抱着重物，双臂伸展在身体前面。接下来，受试者以三种指定的速度进行三种幅度的双肩外展动作(运动动作)。这种马达作用导致了相同载荷的释放，在矢状面上引起了卸载扰动。记录腿部和躯干肌肉的肌电活动。在卸载扰动之前，观察到这些肌肉的背景肌肉活动的变化，并被量化为APAs。APA依赖于运动动作的指令速度；在速度更快的指令下，腿部和躯干肌肉中的APA活动更大。同时，改变运动幅度并未观察到APAs的调制作用。此外，实验表明，没有负荷释放的运动本身不会产生APA活动。因此，我们得出结论，即使在卸载扰动不变的情况下，中枢神经系统也会选择运动动作(即速度指令)中的信息来近似即将到来的扰动的大小，并调制APA。
The purpose of the study was to determine whether characteristics of a motor action affect anticipatory postural adjustments (APAs). Standing subjects held a load between their hands with arms extended in front of their body. Next, subjects performed bilateral shoulder abduction movements (motor action) of three amplitudes at three instructed speeds. This motor action led to the release of the same load, inducing unloading perturbation in the sagittal plane. Electromyographic activities were recorded for the leg and trunk muscles. A change in the background muscle activity in these muscles was observed prior to the unloading perturbation and was quantified as APAs. APAs were dependant on instructed speed of the motor action; larger APA activities were observed in the leg and trunk muscles with a faster speed instruction. Meanwhile, the modulation of APAs was not observed by altering the movement amplitude. Moreover, experiments showed that motor action itself without a load release did not generate APA activity. Therefore, we concluded that the central nervous system selects information within a motor action (i.e., speed instruction) to approximate the magnitude of the forthcoming perturbation and modulate APAs, even when the unloading perturbation was unchanged.