長時間自転車運動が鍛練者の酸化ストレス度及び血中ビタミン濃度におよぼす影響

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Relation between oxidative stress and antioxidant status during long-lasted endurance exercise at moderate intensity is not clear. The purpose of the study was to examine changes of oxidative stress and antioxidant status during 3 hours endurance exercise at intensity of 70% heart rate reserve (70%HRR) in well-trained cyclists. Eight college cyclists participated in this study after giving the informed consent. They performed a steady-state exercise that corresponded to HR of approximately 145 bpm for 3 hours on a cycle ergometer in a laboratory. Blood samples were taken at 5 time points: before exercise (Pre), at 1 hour (Ex 1h), 2 hours (Ex 2h), 3 hours (Ex 3h) during exercise and 1 hour after exercise ( Post 1h), to analyze the oxidative stress, the antioxidant status, plasma vitamin C (VC) and vitamin E (VE) concentrations. The oxidative stress and antioxidant status were determined by using the FRAS4 analyzer. The oxidative stress (d-ROM) did not change during and after exercise. However, the antioxidant status (BAP) and the plasma VC concentration were significantly higher in Ex 1h, Ex 2h, Ex 3h and Post 1h compared with Pre. On the other hand, no changes were found in the plasma VE concentration during and after exercise. In conclusion, endurance exercise for 3 hours at the intensity of 70%HRR increased the plasma antioxidant level, and this increase may contribute to inhibit exercise-induced oxidative stress in well-trained cyclists. We suggest that regular endurance training might improve the antioxidant status in trained athletes.

長時間自転車運動が鍛練者の酸化ストレス度及び血中ビタミン濃度におよぼす影響

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