ANTAGONIST MUSCLE INHIBITION BEFORE RAPID VOLUNTARY MOVEMENTS OF THE HUMAN WRIST
ANTAGONIST MUSCLE INHIBITION BEFORE RAPID VOLUNTARY MOVEMENTS OF THE HUMAN WRIST
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DOI：
10.1016/0168-5597(92)90132-u
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发表时间：
1992-06-01
期刊：
影响因子：
--
通讯作者：
SANES, JN
中科院分区：
文献类型：
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作者：
AGOSTINO, R;HALLETT, M;SANES, JN
当从持续的拮抗肌激活的背景条件进行快速自主运动时，通常在第一次激励性肌肉爆发(AG1)开始之前，拮抗者肌肉的活性下降，直到拮抗者肌肉爆发(ANT)。我们研究了控制峰值速度、运动大小和拮抗者肌肉负荷的大小对拮抗者肌肉抑制(ANCT)的影响。在较低速度和较大尺寸的运动中，以及在较大的背景负荷方向上进行时，ANT更为明显，但在所有情况下，其变化不可能与任何单一的运动学或动力学变量有关。当ANT较大时，ANT较小，这表明ANT不起到类似于AG1之前的激动剂运动前沉默的作用，当时运动是在激动剂持续收缩的背景下进行的。当ANT较大时，AG1的大小也较小，表明根据运动任务的不同，在运动开始时会出现不同程度的相互抑制和共激活。AG1和ANTI都在想要的运动方向上产生力量，中枢神经系统在两者之间选择适当的平衡，如果可能的话，使用ANTI。
When a fast voluntary movement is performed from a background condition of sustained antagonist muscle activation, there is often a decrease in antagonist muscle activity before the onset of the first agonist muscle burst (AG1) that continues until the onset on the antagonist muscle burst (ANT). We studied how controlling the peak velocity, movement size, and the magnitude of antagonist muscle loading affected antagonist muscle inhibition (AntI). AntI was more pronounced during movements with lower velocity and greater size, and when performed in the direction of heavier background loads, but its variation could not be related to any single kinematic or kinetic variable in all circumstances. When AntI was larger, ANT was smaller, suggesting that AntI does not play a role similar to the premotor silence of the agonist seen before AG1 when the movement is made from a background of sustained agonist contraction. When AntI was larger, the size of AG1 was also smaller, showing that, according to the motor task, different levels of reciprocal inhibition and coactivation occur at the onset of the movement. Both AG1 and AntI produce force in the direction of the desired movement, and the central nervous system selects an appropriate balance between the two, using AntI when possible.