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首页> 外文期刊>Human movement science >Muscle coordination and force variability during static and dynamic tracking tasks.
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Muscle coordination and force variability during static and dynamic tracking tasks.

机译：静态和动态跟踪任务期间的肌肉协调和力量变化。

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This study examined muscular activity patterns of extensor and flexor muscles and variability of forces during static and dynamic tracking tasks using compensatory and pursuit display. Fourteen volunteers performed isometric actions in two conditions: (i) a static tracking task consisting of flexion/pronation, ulnar deviation, extension/supination and radial deviation of the wrist at 20% maximum voluntary contraction (MVC), and (ii) a dynamic tracking task aiming at following a moving target at 20% MVC in the four directions of contraction. Surface electromyography (SEMG) from extensor carpi ulnaris, extensor carpi radialis, flexor carpi ulnaris and flexor digitorum superficialis muscles and exerted forces in the transverse and sagittal plane were recorded. Normalized root mean square and mutual information (index of functional connectivity within muscles) of SEMGs and the standard deviation and sample entropy of force signals were extracted. Larger SEMG amplitudes were found for the dynamic task (p<.05), while normalized mutual information between muscle pairs was larger for the static task (p<.05). Larger size of variability (standard deviation of force) concomitant with smaller sample entropy was observed for the dynamic task compared with the static task (p<.01 for both). These findings underline a rescaling of the muscles' respective contribution influencing force variability relying on feedback and feed-forward control strategies in relation to display modes during static and dynamic tracking tasks.
机译：这项研究使用补偿和追踪显示检查了静态和动态跟踪任务期间伸肌和屈肌的肌肉活动模式以及力的可变性。 14名志愿者在两种情况下执行了等距动作：（i）静态跟踪任务，其中腕部屈曲/旋前，尺骨偏斜，伸展/俯仰和radial骨偏斜的最大自愿收缩率（MVC）为20％，并且（ii）动态跟踪任务，旨在遵循四个收缩方向上20％MVC的移动目标。记录尺侧腕腕，radial侧腕腕，尺骨腕腕和指趾浅指肌的表面肌电图（SEMG），并在横断面和矢状面施加力。提取了SEMG的归一化均方根和互信息（肌肉内功能连接的指数）以及力信号的标准偏差和样本熵。动态任务的SEMG振幅较大（p <.05），而静态任务的肌肉对之间的标准化互信息较大（p <.05）。与静态任务相比，动态任务观察到较大的可变性（力的标准偏差），同时样本熵较小（两者均p <0.01）。这些发现表明，在静态和动态跟踪任务期间，依赖于与显示模式有关的反馈和前馈控制策略，影响力可变性的肌肉的各自贡献将重新调整比例。

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