Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos, São Carlos, Brazil.
Department of Sport, School of Physical Education and Sport, University of São Paulo-USP, São Paulo, Brazil.
J Strength Cond Res. 2018 Jan;32(1):162-169. doi: 10.1519/JSC.0000000000001787.
Nóbrega, SR, Ugrinowitsch, C, Pintanel, L, Barcelos, C, and Libardi, CA. Effect of resistance training to muscle failure vs. volitional interruption at high- and low-intensities on muscle mass and strength. J Strength Cond Res 32(1): 162-169, 2018-The purpose of this study was to investigate the effects of resistance training (RT) at high- and low-intensities performed to muscle failure or volitional interruption on muscle strength, cross-sectional area (CSA), pennation angle (PA), and muscle activation. Thirty-two untrained men participated in the study. Each leg was allocated in 1 of 4 unilateral RT protocols: RT to failure at high and low intensities, and RT to volitional interruption (repetitions performed to the point in which participants voluntarily interrupted the exercise) at high (HIRT-V) and low (LIRT-V) intensities. Muscle strength (1 repetition maximum [1RM]), CSA, PA, and muscle activation by amplitude of the electromyography (EMG) signal were assessed before (Pre), after 6 (6W), and 12 (12W) weeks. 1RM increased similarly after 6W (range: 15.8-18.9%, effective size [ES]: 0.41-0.58) and 12W (range: 25.6-33.6%, ES: 0.64-0.98) for all protocols. All protocols were similarly effective in increasing CSA after 6W (range: 3.0-4.6%, ES: 0.10-0.24) and 12W (range: 6.1-7.5%, ES: 0.22-0.26). PA increased after 6W (∼3.5) and 12W (∼9%; main time effect, p < 0.0001), with no differences between protocols. EMG values were significantly higher for the high-intensity protocols at all times (main intensity effect, p < 0.0001). In conclusion, both HIRT-V and LIRT-V are equally effective in increasing muscle mass, strength, and PA when compared with RT performed to muscle failure.
诺布雷加、SR、乌格里尼维奇、C、平塔内尔、L、巴塞洛斯、C 和利巴迪、CA。在高强度和低强度下，肌肉疲劳与自愿中断对肌肉质量和力量的影响。《力量与调节研究杂志》32（1）：162-169，2018 年-本研究的目的是探讨高强度和低强度下的抗阻训练（RT），直至肌肉疲劳或自愿中断对肌肉力量、横截面积（CSA）、肌纤维角度（PA）和肌肉激活的影响。32 名未经训练的男性参与了这项研究。每条腿被分配到 4 个单侧 RT 方案中的 1 个：高强度和低强度下的 RT 直至疲劳，以及高强度（HIRT-V）和低强度（LIRT-V）下的自愿中断（重复至参与者自愿中断运动的点）。肌肉力量（1 次重复最大值[1RM]）、CSA、PA 和肌电图（EMG）信号幅度的肌肉激活在预（Pre）、6 周（6W）和 12 周（12W）后进行评估。所有方案在 6W（范围：15.8-18.9%，有效大小[ES]：0.41-0.58）和 12W（范围：25.6-33.6%，ES：0.64-0.98）后 1RM 相似增加。所有方案在 6W（范围：3.0-4.6%，ES：0.10-0.24）和 12W（范围：6.1-7.5%，ES：0.22-0.26）后 CSA 相似增加。PA 在 6W（约 3.5）和 12W（约 9%；主要时间效应，p<0.0001）后增加，方案之间无差异。在所有时间点，高强度方案的 EMG 值均显著更高（主要强度效应，p<0.0001）。总之，与肌肉疲劳下的 RT 相比，HIRT-V 和 LIRT-V 在增加肌肉质量、力量和 PA 方面同样有效。
