Department of Exercise Sciences, Brigham Young University, Provo, UT 84602, USA.
Program of Gerontology, Brigham Young University, Provo, UT 84602, USA.
Medicina (Kaunas). 2022 Jun 18;58(6):822. doi: 10.3390/medicina58060822.
Background and Objectives: Muscle blood flow is impeded during resistance exercise contractions, but immediately increases during recovery. The purpose of this study was to determine the impact of brief bouts of rest (2 s) between repetitions of resistance exercise on muscle blood flow and exercise tolerance. Materials and Methods: Ten healthy young adults performed single-leg knee extension resistance exercises with no rest between repetitions (i.e., continuous) and with 2 s of rest between each repetition (i.e., intermittent). Exercise tolerance was measured as the maximal power that could be sustained for 3 min (PSUS) and as the maximum number of repetitions (Reps80%) that could be performed at 80% one-repetition maximum (1RM). The leg blood flow, muscle oxygenation of the vastus lateralis and mean arterial pressure (MAP) were measured during various exercise trials. Alpha was set to p ≤ 0.05. Results: Leg blood flow was significantly greater, while vascular resistance and MAP were significantly less during intermittent compared with continuous resistance exercise at the same power outputs (p < 0.01). PSUS was significantly greater during intermittent than continuous resistance exercise (29.5 ± 2.1 vs. 21.7 ± 1.2 W, p = 0.01). Reps80% was also significantly greater during intermittent compared with continuous resistance exercise (26.5 ± 5.3 vs. 16.8 ± 2.1 repetitions, respectively; p = 0.02), potentially due to increased leg blood flow and muscle oxygen saturation during intermittent resistance exercise (p < 0.05). Conclusions: In conclusion, a brief rest between repetitions of resistance exercise effectively decreased vascular resistance, increased blood flow to the exercising muscle, and increased exercise tolerance to resistance exercise.
在抗阻运动收缩期间，肌肉血流受到阻碍，但在恢复期间立即增加。本研究的目的是确定在抗阻运动重复之间短暂休息（2 秒）对肌肉血流和运动耐量的影响。
10 名健康的年轻成年人进行单腿膝关节伸展抗阻运动，重复之间没有休息（即连续），每个重复之间休息 2 秒（即间歇）。运动耐量的测量指标为 3 分钟内可维持的最大功率（PSUS）和 80% 1 次重复最大强度（1RM）下可完成的最大重复次数（Reps80%）。在各种运动试验中测量腿部血流量、股外侧肌的肌肉氧合和平均动脉压（MAP）。设定α值为 p≤0.05。
与连续抗阻运动相比，在相同功率输出下，间歇抗阻运动时腿部血流明显增加，而血管阻力和 MAP 明显降低（p<0.01）。间歇抗阻运动时 PSUS 明显大于连续抗阻运动（29.5±2.1 与 21.7±1.2 W，p=0.01）。间歇抗阻运动时 Reps80%也明显大于连续抗阻运动（26.5±5.3 与 16.8±2.1 次，分别；p=0.02），这可能是由于间歇抗阻运动时腿部血流和肌肉氧饱和度增加（p<0.05）。
总之，在抗阻运动重复之间短暂休息可有效降低血管阻力，增加运动肌肉的血流量，并提高抗阻运动的耐量。
