Strength Research Laboratory, Department of Kinesiology and Health Studies, Southeastern Louisiana University, Hammond, Louisiana, USA.
J Strength Cond Res. 2010 Jan;24(1):235-43. doi: 10.1519/JSC.0b013e3181c7badf.
The purpose of the study was to determine how manipulation of peripheral blood flow during resistance exercise using a light load affected perception and physiological measures compared with moderate load resistance exercise and a control trial. Seven subjects performed a 3 (session) by 2 (biceps curls and calf extensions) within-subjects study that was randomized and counterbalanced across 3 weeks. The 3 sessions included (a) light resistance exercise (3 sets to failure) at 30% of 1 repetition maximum (1RM) with partial occlusion (LRO), (b) moderate resistance at 70% of 1RM with no occlusion (MR), and (c) partial occlusion without exercise (OO). Ratings of perceived exertion (RPE), pain, and heart rate were assessed immediately after each set, whereas blood samples were taken before, immediately after, and 15 minutes after exercise. Results demonstrated that RPE and pain were lower in the OO condition than that in the MR and LRO conditions for biceps curls and calf extensions, Fs(2 ,24) = 22.75, 20.86, ps < 0.0001 and Fs(2,24) = 18.95, 24.52, ps < 0.01; however, no significant differences were noted between MR and LRO conditions. Heart rate was significantly higher for the LRO condition when compared with the MR trial, F(2,18) 20.12, p < 0.001. Results suggest that when partial vascular occlusion with a light load was applied, both pain and effort sense were altered to a similar degree as moderate loads but no occlusion. The practical application of results were that individuals may be better able to tolerate perceptual change at low loads with partial occlusion because joint stress may be minimized while local muscle metabolic demands increase, making resistance training maximally effective and minimally stressful on joints. Perceptual tracking of effort and pain may aid coaches who attempt this protocol.
本研究旨在确定在阻力运动期间使用轻负荷对周围血流进行操纵如何与中等负荷阻力运动和对照试验相比影响感知和生理测量。7 名受试者进行了一项 3（阶段）×2（二头肌卷曲和小腿伸展）的组内研究，该研究在 3 周内随机和平衡分配。3 个阶段包括：（a）使用 30%的 1 次重复最大值（1RM）进行轻负荷运动（3 组至力竭），部分闭塞（LRO）；（b）70%的 1RM 无闭塞（MR）；（c）无运动的部分闭塞（OO）。每组运动后立即评估感知用力（RPE）、疼痛和心率，运动前后 15 分钟各取一次血样。结果表明，对于二头肌卷曲和小腿伸展，OO 条件下的 RPE 和疼痛均低于 MR 和 LRO 条件，F（2,24）=22.75，20.86，ps<0.0001 和 F（2,24）=18.95，24.52，ps<0.01；然而，MR 和 LRO 条件之间没有显著差异。与 MR 试验相比，LRO 条件下的心率显著升高，F（2,18）=20.12，p<0.001。结果表明，当应用轻负荷的部分血管闭塞时，疼痛和用力感的改变程度与中等负荷相似，但无闭塞。结果的实际应用是，个体可能能够更好地耐受低负荷时的感知变化，因为关节应力可能最小化，而局部肌肉代谢需求增加，使阻力训练对关节最大有效且最小压力。用力和疼痛的感知跟踪可能有助于尝试此方案的教练。
