Effects of Different Doses of Antioxidant Intake on Exercise-Induced Oxidative Stress, Antioxidative Capacity and Inflammatory Responses
Rina Suzuki , Akiko Yamaki , Hiroyasu Murata , Kazukuni Hirabuki , Noritaka Hata , Ai Hirasawa , Ken Muramatsu , Takeaki Matsuda , Shigeki Shibata
Journal of Science in Sport and Exercise ›› : 1 -11.
Effects of Different Doses of Antioxidant Intake on Exercise-Induced Oxidative Stress, Antioxidative Capacity and Inflammatory Responses
It is unknown whether an appropriate amount of exogenous antioxidant intake is present to maximize the exercise benefit on lifestyle-related diseases. The purpose of this study was to investigate the effects of two levels of exercise stress and exogenous antioxidant doses on exercise-induced oxidative stress, antioxidant capacity, and inflammatory response.
Wistar male rats were divided into two groups; sedentary (SED) and exercise (TR). The exercise was increased from 4 weeks of lower-load (90 min/week) to 4 weeks of higher-load (300 min/week). TR was subdivided into low (70 mg/kg: TR+N), medium (350 mg/kg: TR+VE-M), and high (700 mg/kg: TR+VE-H) according to the amount of vitamin E intake. Oxidative stress (d-ROMs), antioxidative capacity (BAP), and inflammatory response (hs-CRP: high sensitive C-reactive protein) were measured with blood samples before and after each exercise load PGC1-α was measured with muscle samples using real-time PCR.
d-ROMs increased as exercise load was augmented in all TR and was higher in TR+N and TR+VE-M than in SED after higher-load exercise, while it was not different between SED and TR+VE-H. hs-CRP increased in TR+N and TR+VE-H after higher-load exercise as compared with before. PGC1-α increased only in TR+VE-M after higher-load exercise. CONCLUSIONSː Only medium doses of vitamin E intake may suppress the inflammatory response to oxidative stress during a large amount of exercise without inhibiting the expression of the transcription factor PGC1-α, suggesting the presence of an appropriate dose for exogenous antioxidant intake during exercise.
Oxidative stress / Antioxidant capacity / Vitamin E supplementation / Exercise adaptations / Chronic inflammation / PGC-1α
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Beijing Sport University
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