The effects of varying time under tension and volume load on acute neuromuscular responses

The purpose of this study was to examine the effects of different methods of measuring training volume, controlled in different ways, on selected variables that reflect acute neuromuscular responses. Eighteen resistance-trained males performed three fatiguing protocols of dynamic constant external resistance exercise, involving elbow flexors, that manipulated either time-under-tension (TUT) or volume load (VL), defined as the product of training load and repetitions. Protocol A provided a standard for TUT and VL. Protocol B involved the same VL as Protocol A but only 40% concentric TUT; Protocol C was equated to Protocol A for TUT but only involved 50% VL. Fatigue was assessed by changes in maximum voluntary isometric contraction (MVIC), interpolated doublet (ID), muscle twitch characteristics (peak twitch, time to peak twitch, 0.5 relaxation time, and mean rates of force development and twitch relaxation). All protocols produced significant changes (P

这项研究的目的是检查以不同方式控制训练量的不同方法对反映急性神经肌肉反应的选定变量的影响。十八种阻力训练的男性执行了三种疲劳的动态恒定外部电阻运动，涉及肘部屈肌，这些方案操纵时间不足（TUT）或体积负荷（VL），定义为训练负荷和重复的产物。协议A为TUT和VL提供了标准。协议B涉及与协议A相同的VL，但仅40％同心tut；协议C等同于TUT的协议A，但仅涉及50％的VL。通过最大自愿等距收缩（MVIC），插值双线（ID），肌肉抽搐特征（峰值抽搐，峰值抽搐时间，0.5松弛时间以及平均力的力发育和抽搐松弛的平均速率）来评估疲劳。所有协议都会产生重大变化（P