Department of Health Care Sciences, Physical Therapy Program, College of Pharmacy and Health Sciences, Wayne State University, Detroit, Michigan; and.
Department of Health Care Sciences, Integrative Physiology of Exercise Laboratory, College of Pharmacy and Health Sciences, Wayne State University, Detroit, Michigan.
J Strength Cond Res. 2021 May 1;35(5):1397-1402. doi: 10.1519/JSC.0000000000002919.
Bremer, N, Peoples, G, Hasler, B, Litzenburg, R, Johnson, A, and Malek, MH. Repeated incremental workbouts separated by 1 hour increase the electromyographic fatigue threshold. J Strength Cond Res 35(5): 1397-1402, 2021-Studies examining the influence of priming, for continuous exercise, have mainly focused on improved exercise capacity related to oxygen uptake kinetics rather than on neuromuscular fatigue of the muscle. The purpose of this study, therefore, was to determine whether or not the electromyographic fatigue threshold (EMGFT) could be modulated by having subjects perform 2 incremental tests separated by 1 hour. We hypothesized that the EMGFT determined from the second incremental test would be higher than the EMGFT determined from the first incremental test. Nine healthy college-aged men (mean ± SEM: age: 23.8 ± 0.6 years; body mass: 79.5 ± 3.3 kg; height: 1.78 ± 0.02 m) were recruited from the university population. Each subject visited the laboratory on 1 occasion and performed 2 incremental single-leg knee-extensor ergometry to voluntary fatigue separated by 1 hour. The EMGFT was determined for each trial and statistically compared using paired-samples t-test. The results indicated significant mean differences between the EMGFT for the 2 trials (trial 1: 27 ± 1 W vs. trial 2: 34 ± 2 W; p = 0.001), whereas there were no significant mean differences for maximal power output (trial 1: 53 ± 2 W vs. trial 2: 57 ± 2; p = 0.09). These findings suggest that postactivation potentiation may, in part, explain the differences in EMGFT because the exercise mode used in the current study minimizes the cardiorespiratory responses to exercise.
布雷默、N、皮普斯、G、哈斯勒、B、利曾伯格、R、约翰逊、A 和马利克、MH。间隔 1 小时进行重复递增工作可增加肌电图疲劳阈值。《力量与体能研究杂志》35(5):1397-1402，2021 年-研究连续运动的启动对氧气摄取动力学相关运动能力的影响主要集中在，而不是肌肉的神经肌肉疲劳。因此，本研究的目的是确定受试者在 1 小时内进行两次递增测试是否可以调节肌电图疲劳阈值 (EMGFT)。我们假设，从第二次递增测试确定的 EMGFT 将高于从第一次递增测试确定的 EMGFT。从大学人群中招募了 9 名健康的年轻男性（平均值 ± SEM：年龄：23.8 ± 0.6 岁；体重：79.5 ± 3.3 公斤；身高：1.78 ± 0.02 米）。每个受试者在实验室访问 1 次，并进行 2 次递增单腿膝关节伸展器测功到自愿疲劳，间隔 1 小时。使用配对样本 t 检验确定每个试验的 EMGFT，并进行统计学比较。结果表明，两次试验的 EMGFT 存在显著的均值差异（试验 1：27 ± 1 W 与试验 2：34 ± 2 W；p = 0.001），而最大功率输出的均值差异无统计学意义（试验 1：53 ± 2 W 与试验 2：57 ± 2 W；p = 0.09）。这些发现表明，后激活增强可能部分解释了 EMGFT 的差异，因为当前研究中使用的运动模式最小化了运动对心肺的反应。
