Effects of short-term detraining following blood flow restricted low-intensity training on muscle size and strength.
We investigated the effects of 3 weeks of detraining on muscle cross-sectional area (CSA) and one-repetition maximum strength (1-RM) in young men who had previously participated in 6 weeks (3 days week(-1) ) of bench press training [blood flow restricted low-intensity (LI-BFR; n = 10, 20% 1-RM) or high-intensity (HI; n = 7, 75% 1-RM)]. Bench press 1-RM and muscle CSA of triceps brachii (TB) and pectoralis major (PM) were evaluated before (pre) and after training period (post) as well as after detraining period (detraining). Bench press 1-RM was higher at both post and detraining than at pre for LI-BFR (P<0·01) and the HI (P<0·01). TB and PM muscle CSA were higher at both post and detraining than at pre for the HI group (P<0·01), while the LI-BFR group only increased (P<0·01) at post. Relative dynamic strength (1-RM divided by TB muscle CSA) was higher at both post and detraining than at pre for the HI group (P<0·01), while the LI-BFR group only increased (P<0·01) at detraining. In conclusion, increased muscle strength following 6 weeks of training with LI-BFR as well as HI was well preserved at 3 weeks of detraining. HI-induced muscle strength appears to be dependent upon both neural adaptations and muscle hypertrophy with training and detraining. On the other hand, LI-BFR-induced muscle strength appears to be related primarily to muscle hypertrophy with training and to neural adaptations with detraining.
Department of Ischemic Circulatory Physiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
Tomohiro
T
Yasuda
Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA.
Jeremy P
JP
Loenneke
Faculty of Sport and Health Science, Ritsumeikan University, Kyoto, Japan.
Riki
R
Ogasawara
Department of Kinesiology, Indiana University, Bloomington, IN, USA.
Takashi
T
Abe
D000222:Adaptation, Physiological / Q000502:physiology; D000328:Adult; D001783:Blood Flow Velocity / Q000502:physiology*; D006801:Humans; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000187:drug effects / Q000502:physiology*; D009929:Organ Size / Q000502:physiology; D064797:Physical Conditioning, Human / Q000379:methods*; D005082:Physical Exertion / Q000502:physiology*; D010809:Physical Fitness / Q000502:physiology*; D055815:Young Adult
cessation; magnetic resonance imaging; maximum strength; muscle hypertrophy; vascular occlusion