School of Kinesiology, Applied Health, and Recreation, Oklahoma State University, Stillwater, Oklahoma.
Department of Nutritional Sciences, Oklahoma State University, Stillwater, Oklahoma.
J Strength Cond Res. 2021 Nov 1;35(11):3265-3269. doi: 10.1519/JSC.0000000000003276.
Jenkins, NDM, Miramonti, AA, Hill, EC, Smith, CM, Cochrane-Snyman, KC, Housh, TJ, and Cramer, JT. Mechanomyographic amplitude is sensitive to load-dependent neuromuscular adaptations in response to resistance training. J Strength Cond Res 35(11): 3265-3269, 2021-We examined the sensitivity of the mechanomyographic amplitude (MMGRMS) and frequency (MMGMPF) vs. torque relationships to load-dependent neuromuscular adaptations in response to 6 weeks of higher- vs. lower-load resistance training. Twenty-five men (age = 22.8 ± 4.6 years) were randomly assigned to either a high- (n = 13) or low-load (n = 12) training group and completed 6 weeks of leg extension resistance training at 80 or 30% 1RM. Before and after 3 and 6 weeks of training, mechanomyography signals were recorded during isometric contractions at target torques equal to 10-100% of the subjects' baseline maximal strength to quantify MMGRMS and MMGMPF vs. torque relationships. MMGRMS decreased from Baseline to weeks 3 and 6 in the high-load, but not low-load group, and was dependent on the muscle and intensity of contraction examined. Consequently, MMGRMS was generally lower in the high- than low-load group at weeks 3 and 6, and these differences were most apparent in the vastus lateralis (VL) and rectus femoris muscles at higher contraction intensities. MMGMPF was greater in the high- than low-load training group independent of time or muscle. The MMGRMS vs. torque relationship was sensitive to load-dependent, muscle-specific neuromuscular adaptations and suggest reductions in neuromuscular activation to produce the same absolute submaximal torques after training with high, but not low loads.
詹金斯、NDM、米拉蒙蒂、AA、希尔、EC、史密斯、CM、科克伦-斯尼曼、KC、豪什、TJ 和克拉默、JT。肌肉运动描记术幅度对阻力训练后负荷相关神经肌肉适应性敏感。J 力量与条件研究 35(11)：3265-3269，2021 年-我们研究了肌肉运动描记术幅度（MMGRMS）和频率（MMGMPF）与扭矩关系对 6 周高负荷与低负荷阻力训练后负荷相关神经肌肉适应性的敏感性。25 名男性（年龄=22.8±4.6 岁）被随机分为高负荷（n=13）或低负荷（n=12）训练组，并完成 6 周的腿部伸展阻力训练，负荷分别为 80%或 30%的 1RM。在训练前、第 3 周和第 6 周，在等长收缩期间记录肌肉运动描记术信号，目标扭矩等于受试者基线最大力量的 10-100%，以量化 MMGRMS 和 MMGMPF 与扭矩关系。在高负荷组中，MMGRMS 从基线下降到第 3 周和第 6 周，但在低负荷组中没有下降，并且取决于所检查的肌肉和收缩强度。因此，在第 3 周和第 6 周，高负荷组的 MMGRMS 通常低于低负荷组，在较高的收缩强度下，这些差异在股外侧肌和股直肌中最为明显。MMGMPF 在高负荷组中高于低负荷组，与时间或肌肉无关。MMGRMS 与扭矩关系对负荷相关的、肌肉特异性的神经肌肉适应性敏感，表明在高负荷但不在低负荷训练后，产生相同绝对亚最大扭矩所需的神经肌肉激活减少。
