Strategies for the integration of posture and movement during reaching in the cat
Strategies for the integration of posture and movement during reaching in the cat
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DOI：
10.1152/jn.00339.2003
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发表时间：
2003-11-01
影响因子：
2.5
通讯作者：
Drew, T
中科院分区：
文献类型：
--
作者：
Schepens, B;Drew, T
我们已经研究了运动和预期的姿势调整（APAs）之前，在猫达到任务的运动之间的关系。我们记录了地面反应力在所有3个平面从所有4个肢体，以及肌电图（EMG）活动从肢体和轴向肌肉。到达运动之前总是由阿帕，其特征是由一个负载的达到前肢和卸载的支持前肢。这种负载的达到前肢之前，并伴随着，增加活动的肩膀和肢体伸肌的达到肢体;伸肌活动的支持肢体同时减少。这项研究的一个重要发现是，阿帕和运动的发作是暂时解耦的。对肌电图活动开始的分析表明，我们记录的大多数肌肉都可以归类为与阿帕相关或与运动相关。这些结果支持分布式的想法，也许是独立的，系统的阿帕和总理运动的执行。在运动过程中，支撑肢体也有姿势活动。对这一活动的分析表明，它与这一运动密切相关。我们认为这种姿势反应是作为运动命令的一部分发出的。一些肌肉，特别是伸臂的伸肌，从阿帕和运动的命令信号中接收会聚输入。
We have examined the relationship between the movement and the anticipatory postural adjustments (APAs) that precede that movement during a reaching task in the cat. We recorded ground reaction forces in all 3 planes from all 4 limbs as well as electromyographic (EMG) activity from limb and axial muscles. The reaching movement was always preceded by an APA that was characterized by a loading of the reaching forelimb and an unloading of the support forelimb. This loading of the reaching forelimb was preceded, and accompanied, by increased activity in shoulder and limb extensor muscles of the reaching limb; extensor muscle activity in the supporting limb was simultaneously decreased. An important finding from this study was that the onset of the APA and of the movement was temporally decoupled. Analyses of the onset of EMG activity showed that most of the muscles that we recorded could be classified as either related to the APA or related to the movement. These results support the idea of distributed, and perhaps independent, systems for the execution of the APA and of the prime movement. There was also postural activity in the supporting limb during the movement. Analysis of this activity, which is also anticipatory in nature, suggests that it was tightly linked to the movement. We suggest that this postural response is signaled as part of the command for movement. Some muscles, particularly the extensors of the reaching limb, received convergent input from the command signals for the APA and for the movement.