Exercise-Induced Changes in Redox Status of Elite Karate Athletes

10.4077/CJP.2012.AMM102

Snezana Pesic；Vladimir Jakovljevic；Dusica Djordjevic；Dejan Cubrilo；Vladimir Zivkovic；Vladimir Jorga；Vujadin Mujovic；Dragan Djuric；Biljana Stojimirovic

oxidative stress ； elite athletes ； karate ； phases of training

The Chinese Journal of Physiology

55卷1期（2012 / 02 / 01）

8 - 15

英文

Regular training has been claimed to increase the activity of antioxidant enzymes and, consequently, augments the resistance to oxidative stress; however, large volumes of training performed by elite sportsmen could lead to a chronic oxidative stress state. The aim of our study was to assess the oxidative status of elite athletes at the beginning of the preparatory and the beginning of the competition training phases, so that the influence of three months of programmed physical activity on redox status could be determined. The chronic effects of exercise on the redox state of the athletes were compared to the effects of a single bout of karate training. Thirty elite karate athletes, 16-30 years old, were subjected to maximal graded exercise test to estimate their aerobic capacity; blood sampling was also performed to measure levels of superoxide anion radical (O2(superscript -)), hydrogen peroxide (H2O2), superoxide dismutase activity (SOD) and catalase activity (CAT). The only significant change after the three-month training process was found in the significantly decreased CAT activity (X ± SE: 7.95 ± 0.13 U/g Hb × 10^3 in the preparatory period, 6.65 ± 0.28 U/g Hb × 10^3 in the competition stage; P ＜ 0.01). After a single karate training session, there was statistically significant decrease of O2(superscript -) (X ± SE: 32.7 ± 4.9 nmol/ml in the preparatory period, 24.5 ± 2.5 nmol/ml in the competition stage; P ＜ 0.05) and increase of H2O2 (X ± SE: 11.8 ± 1.0 nmol/ml in the preparatory period, 14.2 ± 0.9 nmol/ml in the competition stage; P ＜ 0.01), as well as significant CAT increase (X ± SE: 6.6 ± 0.6 U/g Hb × 10^3 in the preparatory period, 8.5 ± 0.5 U/g Hb × 10^3 in the competition stage; P ＜ 0.05). Although the three-month training process induced, at the first sight, negative changes in the redox state, expressed through the decrease in CAT activity, adequate response of the antioxidant system of our athletes to acute exercise was preserved.

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