Tomoo Keigo, Suga Tadashi, Dora Kento, Sugimoto Takeshi, Mok Ernest, Tsukamoto Hayato, Takada Shingo, Hashimoto Takeshi, Isaka Tadao
Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Japan.
Research Organization of Science and Technology, Ritsumeikan University, Kusatsu, Japan.
Front Physiol. 2021 Nov 22;12:741966. doi: 10.3389/fphys.2021.741966. eCollection 2021.
The length of rest interval between sets (i.e., inter-set rest interval) is an important variable for resistance exercise program. However, the impact of the inter-set rest interval on improvements in cognitive function following resistance exercise remains unknown. In this study, we compared the effect of short rest interval (SRI) vs. long rest interval (LRI) protocols on post-exercise cognitive inhibitory control (IC) improvements induced by low-intensity resistance exercise. Twenty healthy, young males completed both SRI and LRI sessions in a crossover design. The bilateral knee extensor low-intensity resistance exercise was programed for six sets with 10 repetitions per set using 40% of one-repetition maximum. The inter-set rest interval lengths for SRI and LRI protocols were set for 1 and 3min, respectively. The color-word Stroop task (CWST) was administrated at six time points: baseline, pre-exercise, immediate post-exercise, and every 10min during the 30-min post-exercise recovery period. The levels of blood lactate, which may be an important determinant for improving IC, throughout the 30-min post-exercise recovery period were significantly higher following SRI protocol than following LRI protocol (=0.002 for interaction effect). In line with this result, large-sized decreases in the reverse-Stroop interference score, which represent improved IC, were observed immediately after SRI protocol (=0.94 and 0.82, respectively, vs. baseline and pre-exercise) as opposed to the moderate-sized decreases immediately after LRI protocol (=0.62 and 0.66, respectively, vs. baseline and pre-exercise). Moreover, significant decreases in the reverse-Stroop interference score were observed from 10 to 30min after SRI protocol (all s<0.05 vs. baseline and/or pre-exercise), whereas no such decrease was observed after LRI protocol. Furthermore, the degree of decreases in the reverse-Stroop interference score throughout the 30-min post-exercise recovery period was significantly greater in SRI protocol than in LRI protocol (=0.046 for interaction effect). We suggest that the SRI protocol is more useful in improving post-exercise IC, potentially greater circulating lactate levels, compared to the LRI protocol. Therefore, the inter-set rest interval length may be an important variable for determining the degree of cognitive function improvements following resistance exercise in healthy young males.
组间休息间隔的时长（即组间休息间歇）是抗阻训练计划中的一个重要变量。然而，组间休息间歇对抵抗运动后认知功能改善的影响尚不清楚。在本研究中，我们比较了短休息间歇（SRI）与长休息间歇（LRI）方案对低强度抗阻运动诱导的运动后认知抑制控制（IC）改善的影响。20名健康的年轻男性采用交叉设计完成了SRI和LRI训练。双侧膝关节伸肌低强度抗阻运动计划进行6组，每组10次重复，使用1次最大重复量的40%。SRI和LRI方案的组间休息间歇时长分别设定为1分钟和3分钟。在六个时间点进行颜色-文字斯特鲁普任务（CWST）：基线、运动前、运动后即刻，以及运动后恢复30分钟期间的每10分钟。在运动后恢复30分钟期间，SRI方案后的血乳酸水平显著高于LRI方案（交互作用效应P = 0.002），血乳酸可能是改善IC的一个重要决定因素。与这一结果一致，在SRI方案后立即观察到反向斯特鲁普干扰分数大幅下降，这代表IC得到改善（分别相对于基线和运动前为0.94和0.82），而在LRI方案后立即观察到的是中等程度下降（分别相对于基线和运动前为0.62和0.66）。此外，在SRI方案后10至30分钟观察到反向斯特鲁普干扰分数显著下降（所有P值均<0.05，相对于基线和/或运动前），而在LRI方案后未观察到这种下降。此外，在运动后恢复30分钟期间，SRI方案中反向斯特鲁普干扰分数的下降程度显著大于LRI方案（交互作用效应P = 0.046）。我们认为，与LRI方案相比，SRI方案在改善运动后IC方面更有用，可能是因为循环乳酸水平更高。因此，组间休息间歇时长可能是决定健康年轻男性抗阻运动后认知功能改善程度的一个重要变量。
