Neither Beetroot Juice Supplementation nor Increased Carbohydrate Oxidation Enhance Economy of Prolonged Exercise in Elite Race Walkers.
Neither Beetroot Juice Supplementation nor Increased Carbohydrate Oxidation Enhance Economy of Prolonged Exercise in Elite Race Walkers.
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DOI：
10.3390/nu13082767
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发表时间：
2021-08-12
期刊：
影响因子：
5.9
通讯作者：
McKay AKA
中科院分区：
文献类型：
--
作者：
Burke LM;Hall R;Heikura IA;Ross ML;Tee N;Kent GL;Whitfield J;Forbes SF;Sharma AP;Jones AM;Peeling P;Blackwell JR;Mujika I;Mackay K;Kozior M;Vallance B;McKay AKA
考虑到运动经济对耐力表现的重要性，我们在21名优秀男子竞走运动员的4周训练营中实施了两种旨在减少运动耗氧量的策略。14名运动员进行了交叉研究，甜菜根汁（BRJ）或安慰剂（PLA）[2天预负荷，2小时运动前+ 35分钟运动期间]在26公里竞走速度模拟竞争事件。另外，19名运动员进行了一项多方面策略（MAX; n = 9）的平行组研究，包括慢性（2 w高碳水化合物[CHO]饮食+肠道训练）和急性（运动期间CHO负荷+ 90 g/h CHO）策略，以促进内源性和外源性CHO的可用性，与反映当前指南（CON; n = 10）较低范围的策略相比。BRJ和PLA试验的CHO（p = 0.203）或脂肪（p = 0.818）氧化或耗氧量（p = 0.090）率无差异。与CON相比，MAX与运动期间较高的CHO氧化速率相关，外源性CHO使用增加（CON;峰值= ~0.45 g/min; MAX：峰值= ~1.45 g/min，p < 0.001）。在肠道训练之前，外源性CHO的使用率很高，没有进一步的改善，这表明优秀运动员已经通过习惯性练习优化了肠道CHO的吸收。尽管底物使用存在微小差异，但运动经济性没有差异。未来的研究应探讨这些策略对亚优秀运动员经济的影响以及对优秀运动员成绩的影响。
Given the importance of exercise economy to endurance performance, we implemented two strategies purported to reduce the oxygen cost of exercise within a 4 week training camp in 21 elite male race walkers. Fourteen athletes undertook a crossover investigation with beetroot juice (BRJ) or placebo (PLA) [2 d preload, 2 h pre-exercise + 35 min during exercise] during a 26 km race walking at speeds simulating competitive events. Separately, 19 athletes undertook a parallel group investigation of a multi-pronged strategy (MAX; n = 9) involving chronic (2 w high carbohydrate [CHO] diet + gut training) and acute (CHO loading + 90 g/h CHO during exercise) strategies to promote endogenous and exogenous CHO availability, compared with strategies reflecting lower ranges of current guidelines (CON; n = 10). There were no differences between BRJ and PLA trials for rates of CHO (p = 0.203) or fat (p = 0.818) oxidation or oxygen consumption (p = 0.090). Compared with CON, MAX was associated with higher rates of CHO oxidation during exercise, with increased exogenous CHO use (CON; peak = ~0.45 g/min; MAX: peak = ~1.45 g/min, p < 0.001). High rates of exogenous CHO use were achieved prior to gut training, without further improvement, suggesting that elite athletes already optimise intestinal CHO absorption via habitual practices. No differences in exercise economy were detected despite small differences in substrate use. Future studies should investigate the impact of these strategies on sub-elite athletes’ economy as well as the performance effects in elite groups.
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影响因子：
3.4
作者：
Costa, Ricardo J. S.;Miall, Atlanta;Gibson, Peter
通讯作者：
Gibson, Peter
DOI：
10.1113/jp280221
发表时间：
2021-03
期刊：
The Journal of physiology
影响因子：
--
作者：
Burke LM;Whitfield J;Heikura IA;Ross MLR;Tee N;Forbes SF;Hall R;McKay AKA;Wallett AM;Sharma AP
通讯作者：
Sharma AP
影响因子：
3.7
作者：
Burke, Louise M.;Sharma, Avish P.;Ross, Megan L.
通讯作者：
Ross, Megan L.
影响因子：
3.9
作者：
Jeukendrup, AE
通讯作者：
Jeukendrup, AE
影响因子：
5.9
作者：
Hlinský T;Kumstát M;Vajda P
通讯作者：
Vajda P