Zong Ya, Lu Zhiyuan, Chen Maoqi, Deng Lianfu, Xie Qin, Zhou Ping
Department of Rehabilitation Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Faculty of Rehabilitation Engineering, University of Health and Rehabilitation Sciences, Qingdao, China.
Front Physiol. 2022 Feb 22;13:854385. doi: 10.3389/fphys.2022.854385. eCollection 2022.
The number of motor units of the lumbrical muscles in human hand has not been explored. The objective of this study was to fill this gap by estimating the number of motor units in the second lumbrical muscle. Compound muscle action potential scan of the second lumbrical muscle was performed in 12 healthy subjects, with 10 of them being tested on two separate occasions. Motor unit number estimation (MUNE) was derived from the MScanFit program. The average MUNE of the second lumbrical muscle was 41.6 ± 2.1 (mean ± standard error) from 12 subjects in the first test, and 42.0 ± 2.2 from 10 of the 12 subjects in the retest, demonstrating excellent measurement reliability. Findings of the study provide novel information about the motor unit number of the second lumbrical muscle in human hand. The relatively low motor unit number in the muscle can facilitate motor unit investigations, especially at high level muscle activation.
人类手部蚓状肌的运动单位数量尚未得到研究。本研究的目的是通过估计第二蚓状肌的运动单位数量来填补这一空白。对12名健康受试者的第二蚓状肌进行了复合肌肉动作电位扫描，其中10名受试者在两个不同的时间进行了测试。运动单位数量估计（MUNE）来自MScanFit程序。在第一次测试中，12名受试者第二蚓状肌的平均MUNE为41.6±2.1（平均值±标准误差），在复测中，12名受试者中的10名的MUNE为42.0±2.2，显示出极好的测量可靠性。该研究结果提供了关于人类手部第二蚓状肌运动单位数量的新信息。该肌肉中相对较低的运动单位数量有助于运动单位研究，尤其是在高水平肌肉激活时。
