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首页> 外文期刊>Experimental Brain Research >Sex differences in spatial accuracy relate to the neural activation of antagonistic muscles in young adults
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Sex differences in spatial accuracy relate to the neural activation of antagonistic muscles in young adults

机译：空间准确性的性别差异与年轻成年人拮抗肌的神经激活有关

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摘要

Sex is an important physiological variable of behavior, but its effect on motor control remains poorly understood. Some evidence suggests that women exhibit greater variability during constant contractions and poorer accuracy during goal-directed tasks. However, it remains unclear whether motor output variability or altered muscle activation impairs accuracy in women. Here, we examine sex differences in endpoint accuracy during ankle goal-directed movements and the activity of the antagonistic muscles. Ten women (23.1 +/- A 5.1 years) and 10 men (23 +/- A 3.7 years) aimed to match a target (9A degrees in 180 ms) with ankle dorsiflexion. Participants performed 50 trials and we recorded the endpoint accuracy and the electromyographic (EMG) activity of the primary agonist (Tibialis Anterior; TA) and antagonist (Soleus; SOL) muscles. Women exhibited greater spatial inaccuracy (Position error: t = -2.65, P = 0.016) but not temporal inaccuracy relative to men. The motor output variability was similar for the two sexes (P > 0.2). The spatial inaccuracy in women was related to greater variability in the coordination of the antagonistic muscles (R (2) 0.19, P = 0.03). These findings suggest that women are spatially less accurate than men during fast goal-directed movements likely due to an altered activation of the antagonistic muscles.
机译：性是一种重要的行为的重要生理变量，但它对电机控制的影响仍然很糟糕。有些证据表明，女性在持续收缩期间表现出更大的变化，并且在目标定向任务期间的准确性较差。然而，它仍然不清楚电机输出可变性或改变肌肉激活是否损害女性的准确性。在这里，我们在踝关节目标定向运动期间检查端点精度的性别差异以及拮抗肌的活动。十名女性（23.1 +/- 5.1岁）和10名男子（23 +/- 3.7岁）旨在与脚踝背屈匹配目标（180毫秒的9A度）。参与者进行了50项试验，我们记录了终点精度和初级激动剂（Tibialis前型）和拮抗剂（SOLEUS; SOL）肌肉的电焦精（EMG）活性。妇女表现出更大的空间不准确（位置误差：T = -2.65，P = 0.016），但相对于男性而言不是时间不准确。电机输出变异性对于两种性别相似（P> 0.2）。女性的空间不准确性与拮抗肌肉协调的变异性有关（R（2）0.19，p = 0.03）。这些研究结果表明，由于拮抗肌肉激活改变，女性在快速目标定向运动期间的妇女在空间上比较准确。

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