Thiebaud R S, Loenneke J P, Fahs C A, Kim D, Ye X, Abe T, Nosaka K, Bemben M G
University of Oklahoma Department of Health and Exercise Science 1401 Asp Ave. Norman OK 73019 USA.
Indiana University Bloomington IN USA.
Acta Physiol Hung. 2014 Jun;101(2):150-7. doi: 10.1556/APhysiol.101.2014.2.3.
Discrepancies exist whether blood flow restriction (BFR) exacerbates exercise-induced muscle damage (EIMD). This study compared low-intensity eccentric contractions of the elbow flexors with and without BFR for changes in indirect markers of muscle damage. Nine untrained young men (18-26 y) performed low-intensity (30% 1RM) eccentric contractions (2-s) of the elbow flexors with one arm assigned to BFR and the other arm without BFR. EIMD markers of maximum voluntary isometric contraction (MVC) torque, range of motion (ROM), upper arm circumference, muscle thickness and muscle soreness were measured before, immediately after, 1, 2, 3, and 4 days after exercise. Electromyography (EMG) amplitude of the biceps brachii and brachioradialis were recorded during exercise. EMG amplitude was not significantly different between arms and did not significantly change from set 1 to set 4 for the biceps brachii but increased for the brachioradialis (p ≤ 0.05, 12.0% to 14.5%) when the conditions were combined. No significant differences in the changes in any variables were found between arms. MVC torque decreased 7% immediately post-exercise (p ≤ 0.05), but no significant changes in ROM, circumference, muscle thickness and muscle soreness were found. These results show that BFR does not affect EIMD by low-intensity eccentric contractions.
关于血流限制（BFR）是否会加剧运动诱导的肌肉损伤（EIMD）存在分歧。本研究比较了肘部屈肌在有和没有BFR情况下进行低强度离心收缩时肌肉损伤间接标志物的变化。九名未经训练的年轻男性（18 - 26岁）对肘部屈肌进行低强度（30% 1RM）离心收缩（2秒），一只手臂采用BFR，另一只手臂不采用BFR。在运动前、运动后即刻、运动后1、2、3和4天测量最大自主等长收缩（MVC）扭矩、活动范围（ROM）、上臂围、肌肉厚度和肌肉酸痛等EIMD标志物。运动过程中记录肱二头肌和桡侧腕长伸肌的肌电图（EMG）振幅。双臂之间的EMG振幅无显著差异，肱二头肌从第1组到第4组无显著变化，但合并条件时桡侧腕长伸肌的EMG振幅增加（p≤0.05，从12.0%增至14.5%）。双臂之间在任何变量的变化上均未发现显著差异。MVC扭矩在运动后即刻下降了7%（p≤0.05），但在ROM、围度、肌肉厚度和肌肉酸痛方面未发现显著变化。这些结果表明，BFR不会影响低强度离心收缩引起的EIMD。
