Effects of hyperbaric exposure with high concentration of oxygen on recovery of muscle stiffness and fatigue were investigated. College volleyball players were exposed to hyperbaric exposure (1.25 atm) with high concentration of oxygen (35.0%) for 1 hour a day. After 5 days, oxygen saturation, blood lactate level, muscle stiffness and fatigue were measured before and after hyperbaric exposure. The oxygen saturation increased and the blood lactate level, muscle stiffness and fatigue decreased after hyperbaric exposure. It is concluded that the increased blood flow and oxygen supply by hyperbaric exposure with high concentration of oxygen induce an enhancement in muscle metabolism, which improves muscle stiffness and fatigue.

DESCENTE SPORTS SCIENCE Vol.26/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE