ABSTRACT

　In recent years, low-intensity exercise with muscle blood flow restriction has been used for the rehabilitation of patients with neurological and musculoskeletal disorders. Therefore, the purpose of this study was to examine the effective threshold and exercise volume, taking into account differences in load intensity, in order to obtain effective muscle hypertrophy and strength gain in resistance exercise with blood flow restriction so that it can be applied to a variety of clinical settings. Twenty healthy university students performed plantar flexion exercise with blood flow restriction for 120 seconds, 60 times, using four levels of load intensity from 10% to 40% of one repetition maximum （1-RM） . Intramuscular energy metabolism was measured, and the effective threshold was examined by comparing with exercise at 65% 1-RM, which provides an effective training effect, and exercise at 20% 1-RM under blood flow restriction. It was shown that an external load of 20% 1-RM or more is appropriate for obtaining reliable effects in resistance exercise under blood flow restriction with a fixed exercise time and number of repetitions of 60 times. However, it was also suggested that an effect may be obtained even with 10% 1-RM with blood flow restriction, because it obtains a stronger intramuscular metabolic stress than 20% 1-RM without blood flow restriction, which is usually considered to be less effective.

DECENTE SPORTS SCIENCE Vol.47/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE