نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری، گروه فیزیولوژی ورزش، پردیس دانشگاهی، دانشگاه گیلان، رشت، ایران.
2 دانشیار، گروه فیزیولوژی ورزش، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه گیلان، رشت، ایران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
Background & Purpose: Intense and prolonged physical exercise can lead to oxidative stress. Therefore, many supplements can prevent exercise-induced oxidative stress. The aim of this study was to investigate the effect of short-term supplementation of caffeine-beet juice on antioxidants and exercise performance in endurance athletes.
Methodology: This study was performed in a short-term, counterbalanced, double-blind, cross-over and randomized study that included 7-day supplementation-placebo. Ten male runners (age: 27.5±3.8, weight: 69.9±7.8, height: 176.7±7 were divided in: 1-placebo [PLB] (beetroot juice without nitrate); 2- low dose beetroot juice [BRJ] (140ml BJ+4.8mmol nitrate+200mg caffeine); 3- high dose BRJ [BRJX] (140ml beet juice+9.6mmol nitrate+400mg caffeine). These supplements were taken with 250ml of water twice a day. The Trials were performed during 8 days with 14 days washout. Exercise protocol included 5km running with maximal effort.
Results: The results showed that BRJX supplementation caused a significant increase in antioxidative enzymes (SOD, CAT, GPx) (p<0.05). Also, high and low doses of supplementation had a significant effect on endurance performance (p<0.05).
Conclusion: It can be concluded that high and low doses beetroot-caffeine juice supplementation has a beneficial effect on antioxidants enzymes and exercise performance in endurance athletes. Therefore, it is recommended to use this supplement before endurance exercise to prevent exercise-related oxidative damage and faster reduction of blood lactate and improve performance.
کلیدواژه‌ها [English]
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