Single and Combined Effects of Beetroot Crystals and Sodium Bicarbonate on 4-km Cycling Time Trial Performance
Single and Combined Effects of Beetroot Crystals and Sodium Bicarbonate on 4-km Cycling Time Trial Performance
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DOI：
10.1123/ijsnem.2016-0228
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发表时间：
2017-06-01
影响因子：
2.5
通讯作者：
Burke, Louise M.
中科院分区：
文献类型：
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作者：
Callahan, Marcus J.;Parr, Evelyn B.;Burke, Louise M.
当单独摄入时，甜菜根汁和碳酸氢钠对高强度运动表现有促进作用。本研究旨在确定这些补充剂的独立和联合作用。8名耐力训练（VO 2 max 65 mL.kg.min（-1））的男性自行车运动员在双盲拉丁方设计中完成了4次x 4 km的时间试验（TT），并补充了甜菜根晶体（BC）3天（15 g.day（-1）+15 g TT前1 h，每15 g含300 mg硝酸盐），碳酸氢盐（Bi 0.3 g）。从TT前2.5小时开始，每15分钟给药5次，每次1 kg（-1）体重[ BM]; BC+ Bi或安慰剂（PLA）。受试者在标准实验室条件下使用Velotron踏车测力计完成TT。血浆亚硝酸盐浓度仅在TT前的BC+ Bi试验中显著升高（1520 +/- 786 nmol.L-1）与基线相比（665 +/- 535 nmol.L-1，p = .02）以及Bi和PLA条件（Bi：593 +/- 203 nmol.L-1，p < .01; PLA：543 +/- 369 nmol.L-1，p < .01）。与基线（975 +/- 607 nmol. L-1，p > 0.05）相比，TT前BC试验中血浆亚硝酸盐浓度（1102 +/- 218 nmol. L-1）未升高。TT前BC+ Bi和Bi试验中血液碳酸氢盐浓度升高（BC+Bi：30.9 +/- 2.8 mmol.L-1; Bi：31.7 +/- 1.1 mmol.L-1）。在任何条件下，平均功率输出（386-394 W）或完成TT所需的时间（335.8-338.1 s）均无差异。在本研究的条件下，补充剂对4公里TT性能没有致能作用。
When ingested alone, beetroot juice and sodium bicarbonate are ergogenic for high-intensity exercise performance. This study sought to determine the independent and combined effects of these supplements. Eight endurance trained (VO2max 65 mL.kg.min(-1)) male cyclists completed four x 4-km time trials (TT) in a doubleblind Latin square design supplementing with beetroot crystals (BC) for 3 days (15 g.day(-1) + 15 g 1 h before TT, containing 300 mg nitrate per 15 g), bicarbonate (Bi 0.3 g. kg(-1) body mass [ BM] in 5 doses every 15 min from 2.5 h before TT); BC+ Bi or placebo (PLA). Subjects completed TTs on a Velotron cycle ergometer under standardized laboratory conditions. Plasma nitrite concentrations were significantly elevated only in the BC+ Bi trial before the TT (1520 +/- 786 nmol.L-1) compared with baseline (665 +/- 535 nmol.L-1, p = .02) and the Bi and PLA conditions (Bi: 593 +/- 203 nmol.L-1, p < .01; PLA: 543 +/- 369 nmol.L-1, p < .01). Plasma nitrite concentrations were not elevated in the BC trial before the TT (1102 +/- 218 nmol.L-1) compared with baseline (975 +/- 607 nmol.L-1, p > .05). Blood bicarbonate concentrations were increased in the BC+ Bi and Bi trials before the TT (BC+Bi: 30.9 +/- 2.8 mmol.L-1; Bi: 31.7 +/- 1.1 mmol.L-1). There were no differences in mean power output (386-394 W) or the time taken to complete the TT (335.8-338.1 s) between any conditions. Under the conditions of this study, supplementation was not ergogenic for 4-km TT performance.