Effects of afferent signals derived from peripheral fatigue on efferent command from central nervous system during exercise

本研究的目的是确定腿部蹬踏运动过程中肌肉代谢物的变化对随后的最大等长屈肘过程中的力和表面肌电图活动的影响。在腿部蹬踏运动或口服碳酸氢钠2小时前开始的腿部蹬踏运动的运动强度没有影响力和表面肌电图活动在随后的最大等长屈肘。因此，这些结果表明，腿部蹬踏运动引起的活动肌肉中肌肉代谢物的变化不作为传入信号，以修改传出命令从中枢神经系统在随后的最大随意收缩不活动的肌肉。

The purpose of this study was to determine the effects of changes in muscle metabolites during leg pedaling exercise on force and surface electromyogram activity during subsequent maximal isometric elbow flexion. Exercise intensity during the leg pedaling exercise or oral administration of sodium bicarbonate 2 hours before the initiation of the leg pedaling exercise did not influence force and surface electromyogram activity during subsequent maximal isometric elbow flexion. Therefore, these results suggest that changes in muscle metabolites in active muscles induced by leg pedaling exercise do not act as afferent signals to modify efferent command from the central nervous system during subsequent maximal voluntary contraction in inactive muscles.