Graduate School of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan.
Physiol Rep. 2022 May;10(10):e15294. doi: 10.14814/phy2.15294.
Blood flow restriction (BFR) during low-intensity exercise has been known to be a potent procedure to alter metabolic and oxygen environments in working muscles. Moreover, the use of BFR during inter-set rest periods of repeated sprint exercise has been recently suggested to be a potent procedure for improving training adaptations. The present study was designed to determine the effect of repeated sprint exercise with post-exercise BFR (BFR during rest periods between sprints) on muscle oxygenation in working muscles. Eleven healthy males performed two different conditions on different days: either repeated sprint exercise with BFR during rest periods between sets (BFR condition) or without BFR (CON condition). A repeated sprint exercise consisted of three sets of 3 × 6-s maximal sprints (pedaling) with 24s rest periods between sprints and 5 min rest periods between sets. In BFR condition, two min of BFR (100-120 mmHg) for both legs was conducted between sets. During the exercise, power output and arterial oxygen saturation (SpO ) were evaluated. Muscle oxygenation for the vastus lateralis muscle, exercise-induced changes in muscle blood flow, and muscle oxygen consumption were measured. During BFR between sets, BFR condition presented significantly higher deoxygenated hemoglobin + myoglobin (p < 0.01) and lower tissue saturation index (p < 0.01) than those in CON condition. However, exercise-induced blood lactate elevation and reduction of blood pH did not differ significantly between the conditions. Furthermore, power output throughout nine sprints did not differ significantly between the two conditions. In conclusion, repeated sprint exercise with post-exercise BFR augmented muscle deoxygenation and local hypoxia, without interfering power output.
血液限制（BFR）在低强度运动中已经被证明是一种改变工作肌肉代谢和氧气环境的有效方法。此外，在重复冲刺运动的组间休息期间使用 BFR 最近被建议是一种提高训练适应性的有效方法。本研究旨在确定在工作肌肉中进行重复冲刺运动并在组间休息期间进行 BFR（在冲刺之间的休息期间进行 BFR）对肌肉氧合的影响。11 名健康男性在不同的日子进行了两种不同的条件：一种是在组间休息期间进行重复冲刺运动并进行 BFR（BFR 条件），另一种是不进行 BFR（CON 条件）。重复冲刺运动由三组 3×6 秒最大冲刺（踩踏）组成，每组之间休息 24 秒，每组之间休息 5 分钟。在 BFR 条件下，双腿之间进行两分钟的 BFR（100-120mmHg）。在运动过程中，评估功率输出和动脉血氧饱和度（SpO ）。测量股外侧肌的肌肉氧合、运动引起的肌肉血流量变化和肌肉氧耗量。在组间 BFR 期间，BFR 条件下的去氧血红蛋白+肌红蛋白（p<0.01）和组织饱和度指数（p<0.01）显著高于 CON 条件。然而，两种条件之间的运动引起的血乳酸升高和血液 pH 值降低没有显著差异。此外，在两个条件之间，九个冲刺的功率输出没有显著差异。总之，在重复冲刺运动后进行 BFR 会增加肌肉去氧和局部缺氧，而不会干扰功率输出。
