Influence of acute dietary nitrate supplementation on 50 mile time trial performance in well-trained cyclists
Influence of acute dietary nitrate supplementation on 50 mile time trial performance in well-trained cyclists
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急性膳食硝酸盐补充对训练有素的自行车运动员 50 英里计时赛表现的影响
DOI：
10.1007/s00421-012-2397-6
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发表时间：
2012
影响因子：
3
通讯作者：
A. Jones
中科院分区：
文献类型：
--
作者：
D. Wilkerson;G. M. Hayward;S. Bailey;A. Vanhatalo;Jamie R. Blackwell;A. Jones
据报道，饮食中补充硝酸盐可以使俱乐部级别的自行车运动员的短距离计时赛(TT)成绩提高1-3%。目前尚不清楚这些遍历效应是否会在更长的耐力项目中持续存在，或者饮食中补充硝酸盐是否可以在训练更好的个人中同样程度地提高表现。8名训练有素的男性自行车手进行了两次基于实验室的50英里测试：(1)在饮用0.5 L富硝酸盐甜菜根汁(BR)后2.5h，以及(2)在饮用0.5L硝酸盐耗竭甜菜根汁(PL)后2.5h。BR显著升高血浆[NO_2−](BR：472±96vs.PL：379±94 nM；P<；0.05)，缩短50英里TT完成时间0.8%(BR：136.7±5.6vs.PL：137.9±6.4min)，但无统计学意义(P>；0.05)。[NO_2-−]升高与TT完成时间缩短呈正相关(r=−0.83，P=0.0 1)。功率输出(PO)在任何时间点在不同条件下没有差异(P>；但BR的摄氧量(文件类[12pt]{Minimum}\usepackage{amsath}\usepackage{wa ysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{matrsfs}\usepackage{upgreek}\setlong{\oddsidemargin}{-69pt}\Begin{Document}$\Dot{V}$\end{Document}O2)倾向于较低(P=0.06)，导致显著更大的PO/\DocumentClass[12pt]{Minimum}\Usepackage{amsath}\usepackage{amsFonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathsfs}\usepackage{upgreek}\setLong{\oddsidemargin}{-69pt}\Begin{Document}$$\Dot{V}$\End{Document}O2 Ratio(BR：67.4±5.5vs.PL：65.3±W L min−1；P<；0.05)。总而言之，在训练有素的自行车手中，急性补充甜菜根汁并不能显著提高50英里的TT成绩。与先前研究中测试的中等训练自行车运动员相比，本研究中自行车运动员较好的训练状态可能会降低对补充3号−的生理和运动反应。
Dietary nitrate supplementation has been reported to improve short distance time trial (TT) performance by 1–3 % in club-level cyclists. It is not known if these ergogenic effects persist in longer endurance events or if dietary nitrate supplementation can enhance performance to the same extent in better trained individuals. Eight well-trained male cyclists performed two laboratory-based 50 mile TTs: (1) 2.5 h after consuming 0.5 L of nitrate-rich beetroot juice (BR) and (2) 2.5 h after consuming 0.5 L of nitrate-depleted BR as a placebo (PL). BR significantly elevated plasma [NO2−] (BR: 472 ± 96 vs. PL: 379 ± 94 nM; P < 0.05) and reduced completion time for the 50 mile TT by 0.8 % (BR: 136.7 ± 5.6 vs. PL: 137.9 ± 6.4 min), which was not statistically significant (P > 0.05). There was a significant correlation between the increased post-beverage plasma [NO2−] with BR and the reduction in TT completion time (r = −0.83, P = 0.01). Power output (PO) was not different between the conditions at any point (P > 0.05) but oxygen uptake (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \dot{V} $$\end{document}O2) tended to be lower in BR (P = 0.06), resulting in a significantly greater PO/\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \dot{V} $$\end{document}O2 ratio (BR: 67.4 ± 5.5 vs. PL: 65.3 ± 4.8 W L min−1; P < 0.05). In conclusion, acute dietary supplementation with beetroot juice did not significantly improve 50 mile TT performance in well-trained cyclists. It is possible that the better training status of the cyclists in this study might reduce the physiological and performance response to NO3− supplementation compared with the moderately trained cyclists tested in earlier studies.
影响因子：
29
作者：
Castello, PR;David, PS;Poyton, RO
通讯作者：
Poyton, RO