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首页> 外文期刊>The Journal of Musculoskeletal and Neuronal Interactions >Four weeks of high- versus low-load resistance training to failure on the rate of torque development, electromechanical delay, and contractile twitch properties
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Four weeks of high- versus low-load resistance training to failure on the rate of torque development, electromechanical delay, and contractile twitch properties

机译：进行为期四周的高负荷和低负荷阻力训练，以了解转矩发展，机电延迟和收缩抽搐特性的失败率

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The purpose of this study was to investigate the effects of 4-weeks of high- versus low-load resistance training to failure on rate of torque development (RTD), electromechanical delay (EMD), and contractile twitch characteristics. Fifteen men (mean±SD; age=21.7±2.4 yrs) were randomly assigned to either a high- (80% 1RM; n=7) or low-load (30% 1RM; n=8) training group and completed elbow flexion resistance training to failure 3 times per week for 4 weeks. The participants were tested at baseline, 2-, and 4-weeks of training. Peak RTD (pRTD V ) and RTD at 0-30 (RTD30 V ), 0-50 (RTD50 V ), 0-100 (RTD100 V ), and 0-200 (RTD200 V ) ms, integrated EMG amplitude (iEMG) at 0-30, 0-50, and 0-100 ms, and EMD were quantified during maximal voluntary isometric muscle actions. Peak twitch torque, peak RTD, time to peak twitch, 1/2 re- laxation time and the peak relaxation rate were quantified during evoked twitches. Four weeks of high-load, but not low-load resistance training, increased RTD200 V . There were also increases in iEMG during the first 30 ms of muscle activation for the high- and low-load groups, which may have indirectly indicated increases in early phase motor unit recruitment and/or firing frequency. There were no significant training-induced adaptations in EMD or contractile twitch properties.
机译：这项研究的目的是研究4周高负荷和低负荷阻力训练对失败的影响，这些影响对转矩产生率（RTD），机电延迟（EMD）和收缩抽搐特征的影响。 15名男性（平均±SD;年龄= 21.7±2.4岁）被随机分配至高负荷（80％1RM; n = 7）或低负荷负荷（30％1RM; n = 8）训练组，并完成屈肘对失败的抵抗力训练，每周3次，共4周。在基线，训练的第2周和第4周对参与者进行了测试。峰值RTD（pRTD V）和RTD在0-30（RTD30 V），0-50（RTD50 V），0-100（RTD100 V）和0-200（RTD200 V）ms时，积分EMG振幅（iEMG）为0-30、0-50和0-100 ms，以及EMD在最大的自愿等距肌肉动作中进行了量化。在诱发的抽搐期间，量化了抽搐的峰值扭矩，峰值RTD，到达峰值的时间，1/2松弛时间和峰值松弛率。高负荷而不是低负荷阻力训练的四个星期增加了RTD200V。高负荷组和低负荷组在肌肉激活的前30 ms期间iEMG也有所增加，这可能间接表明早期运动单位募集和/或放电频率增加。没有明显的训练诱发的EMD或收缩性抽搐特性的适应。

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