Restricted Blood Flow Supply and Muscular Antioxidant Ability in Power-Speed Athletes

Abstract

PURPOSE: To determine the effects of moderate intensity training combined with restricting blood flow on muscular antioxidant ability in speed skating athletes. METHODS: 14 male speed skating athletes were randomly divided into two groups: 7 in the experimental group and 7 in the control group. Blood flow of leg was restricted by 20%in experimenatl group during training. Both groups went through a ten weeks slide plate training at a training intensity at 60% of VO2max, twice a week and 20 minutes each session. Superoxide dismutase (SOD), glutathione peroxidase (GSH-PX) maleic dialdehyde (MDA), creatine kinase (CK), ureanitrogen(BUN), blood lactate (BLA) and general anti-oxide ability in blood were examined before and after the training. RESULTS: No difference of SOD, GSH-PX, MDA, CK, BUN, BLA and general anti-oxide ability between the two groups. After training, BUN, GSH-PX and general anti-oxide ability in experimental group increased significantly. After training, SOD in experimental group increased. After training, there were no changes in SOD, BUN, GSH-PX and general anti-oxide ability in control group. The BLA measured 5 minutes after the last training in experiment group was significant higher than that in control group. CONCLUSION: Combining ischemic preconditioning with physical training based on the theory of ischemic preconditioning, training combined with restricted muscular blood flow could improve the antioxidant ability and reinforce the stress endurance ability of skeletal muscle. Moderate intensity training with restricted the volume of muscle blood flow could produce the training result of high intensity training, which could prevent the body's over-fatigue during the training, so optimize the efficiency of physical training. The key to antioxidant ability improvement of skeletal muscle is to combine a proper degree of restricting the volume of muscle blood flow with a suitable intensity of training.