血流限制對於徒手高強度循環訓練效益之影響

Purpose: This study investigated the chronic effects of the bodyweight based high-intensity circuit (7-min workout, 7MW) training with blood flow restriction (BFR) training on aerobic capacity, muscular fitness, body composition in healthy adults. Methods: Thirty-three active and healthy males were recruited and randomly assigned into 7MW, 7MW+BFR, and control (CON, no intervention) group. The 7MW and 7MW+BFR groups performed a 6-wk (3 sessions/week; 1 set in the first 3-wk, 2 sets for the rest of weeks) of 7MW training program. The vascular occlusion (150 mmHg) was administered on both thighs in 7MW+BFR group during exercise. Session rating of perceived exertion (s-RPE) was obtained 30-min after each training session. Participants performed countermovement jump (CMJ), isometric mid-thigh pull (IMTP) test, graded cycling exercise test (GXT), and measurements of skinfold thickness (chest, abdomen, thigh) and thigh circumference (TC) before and after intervention. The pulmonary and muscular oxygenation were measured during GXT. The blood lactate, vascular endothelial growth factor (VEGF), erythropoietin (EPO), growth hormone (GH), insulin-like growth factor-1 (IGF-1), and testosterone were evaluated before and after intervention. Results: No significant differences were found in s-RPE between the 7MW and 7MW+BFR groups. During the last 3-wk, the number of repetitions of push-up, step-up onto chair, squat, triceps dip on chair, high knees, and push-up and rotation at the second set in 7MW+BFR were significantly lower than in 7MW (p < 0.05). Maximum oxygen uptake increased significantly after 7MW (+6.4%) and 7MW+BFR (+5.2%) interventions. The peak (+12.0%) and mean (+11.3%) force during IMTP enhanced significantly in 7MW+BFR, but no significant changes were found in 7MW (+4.5%; +5.3%) and CON (-6.1%; -6.7%). There were no significant interaction effects for fat oxidation and muscular oxygenation during GXT, CMJ height, maximal rate of force development during IMTP, sum of skinfold thickness, and TC. However, abdominal skinfold thickness increased significantly in CON. No significant interaction effects were found on the blood lactate, GH, testosterone, IGF-1, EPO, and VEGF. Conclusions: Both 7MW and 7MW+BFR might improve the aerobic capacity in active males without affecting body composition and power performance. Integrating the vascular occlusion into a 6-wk 7MW program might further increase muscular strength.