1.School of Physical Education,Liaoning Normal University;2.School of Physical Education，Liaoning Normal University
目的：肌肉等长抗阻力训练是肌肉力量训练的一个组成部分，因此研究探讨不同关节角度下肌肉等长最大自主收缩（Maximum Voluntary Contraction， MVC）抗阻力训练神经适应特点，旨在可以为肌肉力量训练、康复训练以及揭示肌肉抗阻力训练的神经适应机制提供参考。方法：招募健康男性大学生30名，随机分成3组，每组分别作肘关节角度在45°，90°，135°MVC等长收缩抗阻力训练（前臂在肘关节处伸直为0°）。每周训练3次，每次训练完成3个持续5s的MVC抗阻力训练，训练6周。结果：肘关节45°角训练前、后肱二头肌表面肌电RMS标准化值为0.572±0.064，0.605±0.051；肘关节90°角则分别为0.594±0.061，0.664±0.061；肘关节135°角分别为0.580±0.067，0.651±0.053；三种角度训练后存在显著性差异。但训练后各角度MF标准化值相互之间不存在显著性差异。结论：依据表面肌电信号RMS角度特异性变化，肱二头肌处于中、大肘关节角度等长抗阻力训练产生的神经适应效果较好，提示对于不能完成动态康复训练的患者采用中、大关节角度等长力量训练会获得较好的神经适应训练效果。表面肌电信号中位频率（MF）不具有角度特异性。
Purpose: Muscle isometric resistance training is an integral part of muscle strength training. Therefore, the research explores the characteristics of nerve adaptation of Maximum Voluntary Contraction (MVC ) resistance training at different joint angles, in order to provide a reference for muscle strength training, rehabilitation training, and revealing neural adaptation mechanism of muscle resistance training.Methods: Thirty healthy male college students were recruited and randomly divided into 3 groups. Each group had an elbow joint angle of 45°, 90°, and 135° MVC isometric contraction resistance training (the forearm was extended at the elbow joint defined as 0°). The subjects were trained 3 times a week, and each training completed 3 MVC resistance training for 5s, and trained for 6 weeks. Results: The RMS normalization values of the biceps muscles surface electromyography (SEMG)before and after training at 45°elbow joint angle were 0.572±0.064, 0.605±0.051; the 90° angle was 0.594±0.061, 0.664±0.061; the 135° angle was 0.580±0.067, 0.651±0.053; there were significant differences after training among three different angles. However, there is no significant difference in MF normalized values of each angle after training.Conclusion: According to the RMS specific change ofSEMG, the biceps brachii is in the middle and large elbow joint angle isometric resistance training produces better nerve adaptation effect. It is suggested that for patients who cannot complete dynamic rehabilitation training, the use of middle and large joint angle isometric strength training will obtain better neural adaptation training effects.The Median frequency (MF) of SEMG signal does not have Angle specific change.