Displacement Mechanomyography Reflects Mechanical Pedaling Force of Muscle Associated with Changes in Cadence and Work Rate During Pedaling
Displacement Mechanomyography Reflects Mechanical Pedaling Force of Muscle Associated with Changes in Cadence and Work Rate During Pedaling
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DOI：
10.1007/s40846-022-00752-1
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发表时间：
2022-09-21
影响因子：
2
通讯作者：
Oka, Hisao
中科院分区：
文献类型：
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作者：
Fukuhara, Shinichi;Oka, Hisao
目的在周期性运动（如蹬踏）中，肌电图（EMG）和肌电（MMG）的联合方法尚未完全了解。本研究的目的是探讨踏车过程中的节奏和工作率的变化对肌电和位移MMG（dMMG）的股内侧肌（VM）同时使用我们开发的MMG/EMG同时测量装置测量的影响。方法以9种踏频和负荷状态下的肌电图和dMMG变化为主要研究指标。研究对象为15名健康男性。在1 kHz采样下，以30、60和90 rpm的节奏和30、60和90 W的功率测量右VM的EMG和dMMG，持续30 s。根据EMG和dMMG的时域波形计算总功率。结果运动速度的增加仅对EMG有显著影响（P < 0.001），但随着步频的增加，EMG（增加）与dMMG（减少）呈相反的关系。此外，dMMG和理论蹬踏扭矩具有显著的强正相关性（p < 0.001）。结论不同负荷和步频的周期性运动中所测得的dMMG反映了蹬踏过程中肌肉的力学特性和净肌力状态。因此，dMMG可以被认为是用于表示骑自行车者的踏板上的传递机械力（即，踩踏期间的净肌肉力量）的生物指标。
Purpose The combined approach of electromyography (EMG) and mechanomyography (MMG) in cyclic exercise, such as pedaling, is not completely understood. The aim of this study was to investigate the effect of changes in cadence and work rate during pedaling on EMG and displacement MMG (dMMG) of the vastus medialis (VM) measured simultaneously using our developed MMG/EMG simultaneous measurement device. Methods The primary endpoints were the change in EMG and dMMG for each cadence and load conditions (9 patterns) during pedaling. The study participants were 15 healthy men. EMG and dMMG of the right VM were measured at 1 kHz sampling for 30 s with a cadence of 30, 60, and 90 rpm and a work rate of 30, 60, and 90 W. Total powers were calculated based on the time domain waveforms of EMG and dMMG. Results The effect of increased work rate responded only to EMG (p < 0.001), but with increasing cadence, EMG (increase) and dMMG (decrease) showed a contrasting relationship. Additionally, dMMG and theoretical pedaling torque had a significant strong positive correlation (p < 0.001). Conclusion The results of this study revealed that the dMMG measured during cyclic exercise with different loads and cadence reflect the mechanical properties and states of net muscle strength during pedaling. Accordingly, the dMMG may be considered as a biological index for representing the transmission mechanical force on the cyclist's pedals, that is, the net muscle strength during pedaling.