Differences in the recruitment properties of the corticospinal pathway between the biceps femoris and rectus femoris muscles
Differences in the recruitment properties of the corticospinal pathway between the biceps femoris and rectus femoris muscles
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股二头肌和股直肌之间皮质脊髓通路募集特性的差异
DOI：
10.1016/j.brainres.2022.147963
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发表时间：
2022
期刊：
影响因子：
2.9
通讯作者：
Hirose Norikazu
中科院分区：
文献类型：
--
作者：
Higashihara Ayako;Nakagawa Kento;Futatsubashi Genki;Sekiguchi Hirofumi;Nagano Yasuharu;Hirose Norikazu
在运动过程中，腿筋和股四头肌的神经肌肉活动对于快速控制力量至关重要。本研究旨在探讨股二头肌长头肌（BFlh）和股直肌（RF）皮质脊髓通路的募集特性。32名男性受试者参与了本研究。采用经颅磁刺激分别研究了等长膝关节屈曲和伸展任务中BFlh和RF的皮质脊髓兴奋性。刺激强度与运动诱发电位振幅呈s型关系，具有平台值、最大斜率和阈值。与RF相比，BFlh的平台值（P< 0.001,d= 1.17）、最大斜率（P< 0.001,r= 0.79）和阈值（P= 0.003,d= 0.62）显著低于RF。结果表明，BFlh和RF在皮质-脊髓通路的募集特性上存在显著差异。这些结果表明，当运动过程中需要突然的大力量时，RF可以通过快速增加运动单位的招募来产生力量。另一方面，BFlh需要更大或更同步的运动命令，以使适当的运动单元行为施加更大的力。这些在腿筋和股四头肌之间的神经生理因素的差异会对运动中力量生成的平衡产生实质性的影响。
The neuromuscular activity in the hamstring and quadriceps muscles is vital for rapid force control during athletic movements. This study aimed to investigate the recruitment properties of the corticospinal pathway of the biceps femoris long head (BFlh) and rectus femoris (RF) muscles. Thirty-two male subjects were participated in this study. Corticospinal excitability was investigated for BFlh and RF during the isometric knee flexion and extension tasks, respectively, using transcranial magnetic stimulation. A sigmoidal relationship was observed between the stimulus intensity and amplitude of motor-evoked potentials and characterized by a plateau value, maximum slope, and threshold. Compared with RF, BFlh had a significantly lower plateau value (P< 0.001,d= 1.17), maximum slope (P< 0.001,r= 0.79), and threshold (P= 0.003,d= 0.62). The results showed that the recruitment properties of the corticospinal pathway significantly differ between BFlh and RF. These results reveal that when a sudden large force is required during athletic movements, the RF can produce force through a rapid increase in the recruitment of motor units. The BFlh, on the other hand, requires larger or more synchronized motor commands for enabling the proper motor unit behavior to exert large forces. These differences in the neurophysiological factors between the hamstrings and quadriceps can have a substantial effect on the balance of force generation during athletic activities.
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