Acute beetroot juice supplementation does not attenuate knee extensor exercise muscle fatigue in a healthy young population.
Acute beetroot juice supplementation does not attenuate knee extensor exercise muscle fatigue in a healthy young population.
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DOI：
10.20463/jenb.2019.0008
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发表时间：
2019-03-31
期刊：
影响因子：
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通讯作者：
Yates, James W
中科院分区：
文献类型：
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作者：
Lee, Seungyong;Abel, Mark G;Yates, James W
目的：急性补充硝酸盐对肌肉疲劳的影响在很大程度上是未知的。本研究旨在评价急性补充硝酸盐对肌肉疲劳的影响。方法：35名休闲活动受试者在两次运动前12小时和2.5小时分别摄入140毫升甜菜根汁(硝酸盐：8 mmol·d-1)或安慰剂(PL)。峰值扭矩在90°·S-1向心性伸膝50次、最大用力和向心性伸膝时测量。结果：BR和PL两种条件下的峰值扭矩、最大功量、疲劳率和工作疲劳率相似。补充BR后，运动后的舒张压(BR：67.2±9.8 vs PL：64.5±7.9 mm Hg，p<；0.05)和平均动脉压(BR：91.6±9.3 vs PL：88.8±8.2 mm Hg，p<；0.05)均有所升高。结论：在健康的休闲活动人群中，急性摄入BR汁对膝关节伸肌力量或疲劳没有影响，但会增加血压。
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.