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首页> 外文期刊>Experimental Brain Research >The medial gastrocnemius muscle attenuates force fluctuations during plantar flexion
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The medial gastrocnemius muscle attenuates force fluctuations during plantar flexion

机译：腓肠内侧肌减弱足底屈曲过程中的力波动

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摘要

Force fluctuations during steady contractions of multiple agonist muscles may be influenced by the relative contribution of force by each muscle. The purpose of the study was to compare force fluctuations during steady contractions performed with the plantar flexor muscles in different knee positions. Nine men (25.8±5.1 years) performed steady contractions of the plantar flexor muscles in the knee-flexed and knee-extended (greater involvement of the gastrocnemii muscles) positions. The maximal voluntary contraction (MVC) force was 32% greater in the knee-extended position compared with the knee-flexed position. The target forces were 2.5–10% MVC force in the respective position. The amplitude of electromyogram in the medial gastrocnemius muscle was greater in the knee-extended position (10.50±9.80%) compared with the knee-flexed position (1.26±1.15%, P<0.01). The amplitude of electromyogram in the soleus muscle was not influenced by the knee position. The amplitude of electromyogram in the lateral gastrocnemius and tibialis anterior muscles was marginal and unaltered with knee position. At the same force (in Newtons), the standard deviation of force was lower in the knee-extended position compared with the knee-flexed position. These results indicate that force fluctuations during plantar flexion are attenuated with greater involvement of the medial gastrocnemius muscle.
机译：多个激动剂肌肉稳定收缩过程中的力量波动可能会受到每个肌肉力量的相对影响。这项研究的目的是比较在不同膝盖位置的足底屈肌进行稳定收缩时的力量波动。九名男性（25.8±5.1岁）在屈膝和伸膝（腓肠肌的更大受累）位置进行了flex屈肌的稳定收缩。与膝盖屈曲位置相比，膝盖伸展位置的最大自愿收缩（MVC）力大32％。目标力是各个位置的2.5-10％MVC力。与屈膝位置（1.26±1.15％，P <0.01）相比，屈膝位置（10.50±9.80％）内侧腓肠肌的肌电图振幅更大。比目鱼肌中肌电图的幅度不受膝盖位置的影响。腓肠肌外侧和胫骨前肌的肌电图幅度很小，并且与膝盖位置无关。在相同的力（以牛顿为单位）下，与膝盖屈曲位置相比，膝盖伸展位置的力标准偏差较小。这些结果表明，随着腓肠肌内侧肌的介入，足底屈曲过程中的力波动被减弱。

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