Smith Cory M, Housh Terry J, Hill Ethan C, Keller Joshua L, Johnson Glen O, Schmidt Richard J
University of Nebraska - Lincoln, Lincoln, NE, United States.
University of Nebraska - Lincoln, Lincoln, NE, United States.
J Electromyogr Kinesiol. 2017 Dec;37:9-14. doi: 10.1016/j.jelekin.2017.08.001. Epub 2017 Aug 23.
This study used a combined electromyographic, mechanomyographic, and force approach to identify electromechanical delay (EMD) from the onsets of the electromyographic to force signals (EMD), onsets of the electromyographic to mechanomyogrpahic signals (EMD), and onsets of mechanomyographic to force signals (EMD). The purposes of the current study were to examine: (1) differences in EMD, EMD, and EMD from the vastus lateralis between maximal isokinetic and maximal concentric isometric leg extensions; and (2) the effects of fatigue and recovery on EMD, EMD, and EMD. These EMD measures were obtained from twelve men during maximal concentric isokinetic and isometric leg extensions pretest, posttest, and after 3-min and 5-min of recovery from 25 maximal isokinetic leg extensions at 60°s. The results indicated no differences between maximal isokinetic and isometric muscle actions for EMD, EMD, or EMD during the pretest, posttest, 3-min recovery, and 5-min recovery measurements. These findings support the comparison of voluntary EMD measures between studies with different modes of exercise as long as the methodology for the determination of EMD are consistent. There were, however, fatigue-induced pretest to posttest increases in EMD, EMD, and EMD which remained elongated after 3-min of recovery, but returned to pretest values after 5-min of recovery.
本研究采用肌电图、机械肌电图和力量相结合的方法，从肌电图信号到力量信号的起始点（肌电-机械延迟，EMD）、肌电图信号到机械肌电图信号的起始点（EMD）以及机械肌电图信号到力量信号的起始点（EMD）来识别机电延迟。本研究的目的是检验：（1）在最大等速和最大同心等长腿部伸展过程中，股外侧肌的EMD、EMD和EMD之间的差异；（2）疲劳和恢复对EMD、EMD和EMD的影响。这些EMD测量值是在12名男性进行最大同心等速和等长腿部伸展的预测试、后测试以及在从25次60°/秒的最大等速腿部伸展恢复3分钟和5分钟后获得的。结果表明，在预测试、后测试、3分钟恢复和5分钟恢复测量期间，最大等速和等长肌肉动作在EMD、EMD或EMD方面没有差异。这些发现支持在不同运动模式的研究之间比较自愿EMD测量值，只要确定EMD的方法是一致的。然而，疲劳导致预测试到后测试期间EMD、EMD和EMD增加，在恢复3分钟后仍保持延长，但在恢复5分钟后恢复到预测试值。
