UNLABELLED: The beneficial effects of exercise and a healthy diet are well documented in the general population but poorly understood in elite athletes. Previous research in subelite athletes suggests that regular training and an antioxidant-rich diet enhance antioxidant defenses but not performance. PURPOSE: To investigate whether habitual diet and/or exercise (training status or performance) affect antioxidant status in elite athletes. METHODS: Antioxidant blood biomarkers were assessed before and after a 30-min ergometer time trial in 28 male and 34 female rowers. The antioxidant blood biomarkers included ascorbic acid, uric acid, total antioxidant capacity (TAC), erythrocyte- superoxide dismutase, glutathione peroxidase (GPx), and catalase. Rowers completed a 7-d food diary and an antioxidant-intake questionnaire. Effects of diet, training, and performance on resting biomarkers were assessed with Pearson correlations, and their effect on exercise-induced changes in blood biomarkers was assessed by a method of standardization. RESULTS: With the exception of GPx, there were small to moderate increases with exercise for all markers. Blood resting TAC had a small correlation with total antioxidant intake (correlation .29; 90% confidence limits, ±.27), and the exercise-induced change in TAC had a trivial to small association with dietary antioxidant intake from vitamin C (standardized effect .19; ±.22), vegetables (.20; ±.23), and vitamin A (.25; ±.27). Most other dietary intakes had trivial associations with antioxidant biomarkers. Years of training had a small inverse correlation with TAC (-.32; ±.19) and a small association with the exercise-induced change in TAC (.27; ±.24). CONCLUSION: Training status correlates more strongly with antioxidant status than diet does.
UNLABELLED: The beneficial effects of exercise and a healthy diet are well documented in the general population but poorly understood in elite athletes. Previous research in subelite athletes suggests that regular training and an antioxidant-rich diet enhance antioxidant defenses but not performance. PURPOSE: To investigate whether habitual diet and/or exercise (training status or performance) affect antioxidant status in elite athletes. METHODS: Antioxidant blood biomarkers were assessed before and after a 30-min ergometer time trial in 28 male and 34 female rowers. The antioxidant blood biomarkers included ascorbic acid, uric acid, total antioxidant capacity (TAC), erythrocyte- superoxide dismutase, glutathione peroxidase (GPx), and catalase. Rowers completed a 7-d food diary and an antioxidant-intake questionnaire. Effects of diet, training, and performance on resting biomarkers were assessed with Pearson correlations, and their effect on exercise-induced changes in blood biomarkers was assessed by a method of standardization. RESULTS: With the exception of GPx, there were small to moderate increases with exercise for all markers. Blood resting TAC had a small correlation with total antioxidant intake (correlation .29; 90% confidence limits, ±.27), and the exercise-induced change in TAC had a trivial to small association with dietary antioxidant intake from vitamin C (standardized effect .19; ±.22), vegetables (.20; ±.23), and vitamin A (.25; ±.27). Most other dietary intakes had trivial associations with antioxidant biomarkers. Years of training had a small inverse correlation with TAC (-.32; ±.19) and a small association with the exercise-induced change in TAC (.27; ±.24). CONCLUSION: Training status correlates more strongly with antioxidant status than diet does.
Authors: Jeffrey A Rothschild; Andrew E Kilding; Sophie C Broome; Tom Stewart; John B Cronin; Daniel J Plews Journal: Nutrients Date: 2021-04-14 Impact factor: 5.717
Authors: Anna Gawron-Skarbek; Jacek Chrzczanowicz; Joanna Kostka; Dariusz Nowak; Wojciech Drygas; Anna Jegier; Tomasz Kostka Journal: Oxid Med Cell Longev Date: 2015-09-14 Impact factor: 6.543
Authors: A Urbaniak; P Basta; K Ast; A Wołoszyn; J Kuriańska-Wołoszyn; Ewa Latour; A Skarpańska-Stejnborn Journal: J Int Soc Sports Nutr Date: 2018-07-24 Impact factor: 5.150