Mano Tomoo, Iguchi Naohiko, Iwasa Naoki, Fujimura Shigekazu, Takatani Tsunenori, Sugie Kazuma
Department of Neurology, Nara Medical University, Kashihara, Japan.
Department of Rehabilitation Medicine, Nara Medical University, Kashihara, Japan.
Clin Neurophysiol Pract. 2023 Jun 29;8:132-136. doi: 10.1016/j.cnp.2023.05.004. eCollection 2023.
Muscle strength, which correlates with the compound muscle action potential (CMAP), can also be estimated by measuring the CMAP. Therefore, we evaluated the CMAP of the flexor muscles of the whole forearm to identify their muscle strength.
Fourteen healthy volunteers were enrolled. The elbow was determined to be the stimulation point, and the recording site for the flexor muscles of the whole forearm was set at approximately 8 cm distal to the elbow. We prospectively evaluated the baseline-to-peak amplitude of the CMAP of the whole forearm flexor muscles (WFFM), including that obtained from the median nerve stimulation (WFFMm), ulnar nerve stimulation (WFFMu), and their sum (WFFMsum). Additionally, we analyzed the relationships between WFFMm and WFFMu amplitudes with other quantitative parameters, including grip strength and routine CMAP amplitudes.
The CMAP's test-retest analysis revealed high reliability. Grip power was significantly correlated with WFFMm and WFFMsum and mildly correlated with WFFMu. Tip-pinch strength with WFFMm and flexor pollicis longus (FPL) measurements correlated significantly. Lateral-pinch strength was significantly correlated with the first dorsal interosseous muscle (FDI) measurements but not with WFFM. The abductor digiti minimi (ADM) and abductor pollicis brevis (APB) were not correlated with grip power or pinch strength.
By electrophysiology examination, this study demonstrated that WFFMm is involved in grip power and other pinch strengths. This method may serve as a novel tool for measurement of distal muscle strengths.
This is the first study to attempt to evaluate the muscle strength of forearm flexor muscles by measuring the CMAP.
肌肉力量与复合肌肉动作电位（CMAP）相关，也可通过测量CMAP来估计。因此，我们评估了整个前臂屈肌的CMAP，以确定其肌肉力量。
招募了14名健康志愿者。确定肘部为刺激点，将整个前臂屈肌的记录部位设置在肘部远端约8厘米处。我们前瞻性地评估了整个前臂屈肌（WFFM）的CMAP从基线到峰值的振幅，包括从中正中神经刺激获得的振幅（WFFMm）、尺神经刺激获得的振幅（WFFMu）及其总和（WFFMsum）。此外，我们分析了WFFMm和WFFMu振幅与其他定量参数之间的关系，包括握力和常规CMAP振幅。
CMAP的重测分析显示出高可靠性。握力与WFFMm和WFFMsum显著相关，与WFFMu轻度相关。用WFFMm和拇长屈肌（FPL）测量的指尖捏力显著相关。侧捏力与第一背侧骨间肌（FDI）测量显著相关，但与WFFM无关。小指展肌（ADM）和拇短展肌（APB）与握力或捏力无关。
通过电生理检查，本研究表明WFFMm与握力和其他捏力有关。该方法可作为测量远端肌肉力量的一种新工具。
这是第一项试图通过测量CMAP来评估前臂屈肌肌肉力量的研究。
