JOURNAL OF SPORTS SCIENCE & MEDICINE

Research article

LEGS AND TRUNK MUSCLE HYPERTROPHY FOLLOWING WALK TRAINING WITH RESTRICTED LEG MUSCLE BLOOD FLOW

Mikako Sakamaki1, Michael G. Bemben2 and Takashi Abe1

1Graduate School of Frontier Science, The University of Tokyo, Kashiwa, Chiba, Japan 2Department of Health and Exercise Science, The University of Oklahoma, Norman, OK, USA

Received   03 March 2011 Accepted   04 March 2011 Published   01 June 2011

© Journal of Sports Science and Medicine (2011) 10, 338 - 340

ABSTRACT

We examined the effect of walk training combined with blood flow restriction (BFR) on the size of blood flow-restricted distal muscles, as well as, on the size of non-restricted muscles in the proximal limb and trunk. Nine men performed walk training with BFR and 8 men performed walk training alone. Training was conducted two times a day, 6 days/wk, for 3 wk using five sets of 2-min bouts (treadmill speed at 50 m/min), with a 1-min rest between bouts. After walk training with BFR, MRI-measured upper (3.8%, P < 0.05) and lower leg (3.2%, P < 0. 05) muscle volume increased significantly, whereas the muscle volume of the gluteus maximus (-0.6%) and iliopsoas (1.8%) and the muscle CSA of the lumber L4-L5 (-1.0) did not change. There was no significant change in muscle volume in the walk training alone. Our results suggest that the combination of leg muscle blood flow restriction with slow walk training elicits hypertrophy only in the distal blood flow restricted leg muscles. Exercise intensity may be too low during BFR walk training to increase muscle mass in the non- blood flow restricted muscles (gluteus maximus and other trunk muscles). Key words: Vascular occlusion, magnetic resonance imaging, ultrasound.

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