نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه تربیت بدنی ، واحد خرم آباد، دانشگاه آزاد اسلامی، خرم آباد، ایران
2 کارشناسی ارشد، گروه تربیت بدنی، دانشکده علوم انسانی، دانشگاه آزاد اسلامی، خرم آباد، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Objective: The aim of this study was to investigate the effect of 8-week dietary nitrate supplementation (beetroot juice) on anaerobic performance, metabolic indices, and muscle fatigue in male athletes.
Methodology: This quasi-experimental study was conducted with 24 male athletes (12 experimental, 12 control). The experimental group consumed 70 ml of beetroot juice daily, 2–3 hours before training, for 8 weeks, while the control group received a placebo. Anaerobic performance was assessed using the Wingate test (peak power, mean power, fatigue index), metabolic indices were assessed via blood lactate and VO₂, and fatigue was assessed using the fatigue index and RPE. Data were analyzed using paired t-test and ANCOVA at a significance level of P ≤ 0.05.
Findings: In the experimental group, peak power (8.05%), mean power (7.83%), and VO₂ (8.73%) increased, while fatigue index (17.62%), blood lactate (18.23%), and RPE (10.98%) decreased (P = 0.001). The control group showed no significant changes. ANCOVA with baseline adjustment confirmed significant differences between the two groups in all variables (P = 0.001).
Conclusion: Eight weeks of beetroot juice supplementation at a dose of 70 ml per day, in this sample, was associated with improved anaerobic performance, favorable metabolic changes, and reduced fatigue. Due to the limited sample size, generalization of the findings should be done with caution.
کلیدواژهها [English]
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