Acute beetroot juice supplementation does not attenuate knee extensor exercise muscle fatigue in a healthy young population.

Journal of Exercise Nutrition & Biochemistry Pub Date : 2019-03-31 DOI:10.20463/jenb.2019.0008

Seungyong Lee, Mark G Abel, Travis Thomas, T Brock Symons, James W Yates

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Abstract

Purpose: The effect of acute nitrate supplementation on muscle fatigue is largely unknown. This study aimed to evaluate the effect of acute nitrate supplementation on muscle fatigue.

Methods: Thirty-five recreationally active subjects consumed 140 ml of beetroot (BR) juice (nitrate: 8 mmol·d-1) or placebo (PL) 12 and 2.5 hours before two exercise sessions. Peak torque was measured during 50 repetitions, at maximal effort, and during concentric knee extensions at 90°·s-1. Blood pressure (BP) was recorded pre- and post-exercise.

Results: Peak torque, maximum work, rate of fatigue, and rate of work fatigue were similar between the BR and PL conditions. Post-exercise diastolic BP (BR: 67.2 ± 9.8 vs. PL: 64.5 ± 7.9 mmHg, p < 0.05) and mean arterial pressure (BR: 91.6 ± 9.3 vs. PL: 88.8 ± 8.2 mmHg, p < 0.05) were higher with BR supplementation.

Conclusion: These findings suggest that the acute intake of BR juice had no effect on knee extensor muscle strength or fatigue but increased BP in a healthy recreationally active population.

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在健康的年轻人群中，急性补充甜菜根汁不会减轻膝关节伸展运动的肌肉疲劳。

目的：急性硝酸盐补充剂对肌肉疲劳的影响尚不清楚。本研究旨在评估急性硝酸盐补充剂对肌肉疲劳的影响：方法：35 名参加娱乐活动的受试者在两次运动前 12 小时和 2.5 小时分别饮用 140 毫升甜菜根汁（硝酸盐：8 毫摩尔-d-1）或安慰剂（PL）。峰值扭矩的测量是在50次重复运动中，以最大力度和90°-s-1的速度同心伸膝时进行的。运动前后记录血压：结果：BR 和 PL 条件下的峰值扭矩、最大做功、疲劳率和做功疲劳率相似。运动后舒张压（BR：67.2 ± 9.8 vs. PL：64.5 ± 7.9 mmHg，P < 0.05）和平均动脉压（BR：91.6 ± 9.3 vs. PL：88.8 ± 8.2 mmHg，P < 0.05）在补充 BR 的情况下更高：这些研究结果表明，在健康的娱乐活动人群中，急性摄入金砖果汁对膝关节伸肌力量或疲劳没有影响，但会增加血压。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of Exercise Nutrition & Biochemistry

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