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1 Physiology Division, Yokohama City Sports Medical Center, Yokohama 222-0036; 2 Sato Institute for Rehabilitation and Fitness, Tokyo 183; 3 Urafune Hospital of Yokohama City University, Yokohama 232; 4 Tanaka Women's Clinic, Tokyo 158; and 5 Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan
Acute and long-term effects of resistance exercise combined with vascular occlusion on muscular function were investigated. Changes in integrated electromyogram with respect to time (iEMG), vascular resistive index, and plasma lactate concentration were measured in five men either during or after elbow flexion exercises with the proximal end of the arm occluded at 0-100 mmHg. The mean iEMG, postexercise hyperemia, and plasma lactate concentration were all elevated with the increase in occlusion pressure at a low-intensity exercise, whereas they were unchanged with the increase in occlusion pressure at high-intensity exercise. To investigate the long-term effects of low-intensity exercise with occlusion, older women (n = 24) were subjected to a 16-wk exercise training for elbow flexor muscles, in which low-intensity [~50-30% one repetition maximum (1 RM)] exercise with occlusion at ~110 mmHg (LIO), low-intensity exercise without occlusion (LI), and high- to medium-intensity (~80-50% 1 RM) exercise without occlusion (HI) were performed. Percent increases in both cross-sectional area and isokinetic strength of elbow flexor muscles after LIO were larger than those after LI (P < 0.05) and similar to those after HI. The results suggest that resistance exercise at an intensity even lower than 50% 1 RM is effective in inducing muscular hypertrophy and concomitant increase in strength when combined with vascular occlusion.
muscular hypertrophy; force-velocity relation; ischemia
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