Physical Therapy Program, Department of Health Care Sciences, College of Pharmacy and Health Sciences, Wayne State University, Detroit, Michigan.
Integrative Physiology of Exercise Laboratory, Department of Health Care Sciences, College of Pharmacy and Health Sciences, Wayne State University, Detroit, Michigan.
J Strength Cond Res. 2017 Dec;31(12):3503-3507. doi: 10.1519/JSC.0000000000002274.
Khan, FL, Lawal, JM, Kapture, DO, Swingle, JD, and Malek, MH. Revisiting the single-visit protocol for determining the electromyographic fatigue threshold. J Strength Cond Res 31(12): 3503-3507, 2017-The electromyographic fatigue threshold (EMGFT) has been shown to demarcate between nonfatiguing and fatiguing exercise workloads. One potential limitation of incorporating the single EMGFT test in a clinical setting is the 2-minute stage increment inherit to the protocol. In most rehabilitation clinics, time with the client is limited, and any testing procedure needs to consider this factor. The purpose of this study, therefore, was to determine whether or not the estimation of the EMGFT is influenced by reducing the incremental stage to 1-minute intervals. We hypothesized that the 1-minute incremental protocol would provide similar estimates of the EMGFT as the traditional 2-minute incremental protocol. Nine college-aged men performed the single-leg knee-extensor ergometry at 1-minute (3 W) and 2-minute (6 W) stages in random order separated by 7 days. The exercise indices and the EMGFT were determined from the 2 protocols and analyzed using a paired samples t test. The EMG amplitude was assessed from the rectus femoris muscle. The results indicated significant differences between protocols for maximal power output (1 minute: 31.7 ± 2.2 W vs. 2 minutes: 38.0 ± 3.3 W, p = 0.016) and heart rate at end exercise (1 minute: 137 ± 5 b·min vs. 2 minutes: 148 ± 5 b·min, p = 0.024). There were, however, no significant mean differences for the EMGFT (1 minute: 19.8 ± 1.8 vs. 2 minutes: 20.3 ± 1.9 W, p = 0.63) and rating of perceived exertion (RPE) for the exercised leg (1 minute: 9 ± 0 vs. 2 minutes: 9 ± 1, p = 0.68). These results indicate that reducing the exercise protocol by 50% did not change the estimated EMGFT. The practical application of this finding resides in the potential use in sports or rehabilitative settings in which there is limited time with the client and no objective measures to determine neuromuscular fatigue for aerobic exercise.
汗，FL，罗亚尔，JM，卡普特，博士，斯温格尔，JD，和马利克，MH。重新审视用于确定肌电图疲劳阈值的单次就诊方案。 J 强能力研究 31(12)：3503-3507，2017 年-肌电图疲劳阈值 (EMGFT) 已被证明可以区分非疲劳和疲劳运动负荷。在临床环境中纳入单次 EMGFT 测试的一个潜在限制是协议中固有的 2 分钟阶段增量。在大多数康复诊所中，与客户的时间有限，任何测试程序都需要考虑到这一因素。因此，本研究的目的是确定减少增量阶段至 1 分钟间隔是否会影响 EMGFT 的估计。我们假设 1 分钟增量方案将提供与传统 2 分钟增量方案相似的 EMGFT 估计。9 名大学生男子以 1 分钟（3 W）和 2 分钟（6 W）的顺序随机进行单腿伸膝运动，间隔 7 天。使用配对样本 t 检验分析从 2 种方案中确定的运动指数和 EMGFT。从股直肌评估肌电图幅度。结果表明，在最大输出功率（1 分钟：31.7 ± 2.2 W 与 2 分钟：38.0 ± 3.3 W，p = 0.016）和运动结束时的心率（1 分钟：137 ± 5 b·min 与 2 分钟：148 ± 5 b·min，p = 0.024）方面，方案之间存在显著差异。然而，对于 EMGFT（1 分钟：19.8 ± 1.8 与 2 分钟：20.3 ± 1.9 W，p = 0.63）和被试腿的感知用力等级（1 分钟：9 ± 0 与 2 分钟：9 ± 1，p = 0.68）没有显著的平均差异。这些结果表明，通过将运动方案减少 50%，不会改变估计的 EMGFT。这一发现的实际应用在于在运动或康复环境中可能的应用，在这些环境中，与客户的时间有限，没有客观的措施来确定有氧运动的神经肌肉疲劳。
