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首页> 外文期刊>Journal of the International Society of Sports Nutrition >Effects of a commercially available branched-chain amino acid-alanine-carbohydrate-based sports supplement on perceived exertion and performance in high intensity endurance cycling tests
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Effects of a commercially available branched-chain amino acid-alanine-carbohydrate-based sports supplement on perceived exertion and performance in high intensity endurance cycling tests

机译：市售支链氨基酸 - 碳水化合物的运动补充对高强度耐久性循环试验中的施加和性能的影响

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Sports nutritional supplements containing branched-chain amino acids (BCAA) have been widely reported to improve psychological and biological aspects connected to central fatigue and performance in endurance exercise, although the topic is still open to debate. The aim of the present study was to determine whether the intake of a commercially available BCAA-based supplement, taken according to the manufacturer’s recommendations, could affect the rating of perceived exertion (RPE) and performance indexes at the beginning (1d) and end of a 9-week (9w) scheduled high intensity interval training program, with an experimental approach integrating the determination of psychometric, performance, metabolic and blood biochemical parameters. This was a randomized double-blind placebo-controlled study. Thirty-two untrained, healthy young adults (20 males and 12 female) were enrolled. A high-intensity endurance cycling (HIEC) test was used to induce fatigue in the participants: HIEC consisted in ten 90?s sprints interspersed by ten 3?min recovery phases and followed by a final step time to exhaustion was used. In parallel with RPE, haematological values (creatine kinase, alanine, BCAA, tryptophan, ammonia and glucose levels), and performance indexes (maximal oxygen consumption - VO2max, power associated with lactate thresholds - WLT1, WLT2 and time to exhaustion - TTE) were assessed. All subject took the supplement (13.2?g of carbohydrates; 3.2?g of BCAA and 1.6?g of L-alanine per dose) or placebo before each test and training session. Dietary habits and training load were monitored during the entire training period. The administration of the supplement (SU) at 1d reduced RPE by 9% during the recovery phase, as compared to the placebo (PL); at 9w the RPE scores were reduced by 13 and 21% during the sprint and recovery phase, respectively; at 9w, prolonged supplement intake also improved TTE and TRIMP. SU intake invariably promoted a rapid increase (within 1?h) of BCAA serum blood levels and prevented the post-HIEC tryptophan: BCAA ratio increase found in the PL group, at both 1d and 9w. There was no difference in dietary habits between groups and those habits did not change over time; no difference in glycemia was found between SU and PL. VO2max, WLT1 and WLT2 values improved over time, but were unaffected by supplement intake. On the whole, these results suggest that i) the intake of the BCAA-based commercially available supplement used in this study reduces RPE as a likely consequence of an improvement in the serum tryptophan: BCAA ratio; ii) over time, reduced RPE allows subjects to sustain higher workloads, leading to increased TRIMP and TTE.
机译：含有分枝链氨基酸（BCAA）的运动营养补充已被广泛报道，以改善与耐力运动中的中央疲劳和性能有关的心理和生物学方面，尽管该话题仍然辩论。本研究的目的是根据制造商的建议确定采取市售BCAA的补充剂是否会影响感知劳动（RPE）和绩效指标在开始（1D）和结尾的额定值一个9周（9W）预定的高强度间隔训练计划，实验方法集成了心动测量，性能，代谢和血液生化参数的确定。这是一项随机的双盲安慰剂对照研究。已经注册了三十二个未经训练，健康的年轻成年人（20名男性和12名女性）。使用高强度耐久性循环（HIEC）试验用于诱导参与者的疲劳：HIEC组成的10 90°S的冲刺，在10个3？最小恢复相中散布，然后使用最后一步到达耗尽。与RPE平行，血液学值（肌酸激酶，丙氨酸，BCAA，色氨酸，氨和葡萄糖水平），以及性能指标（最大氧气消耗 - VO2MAX，与乳酸阈值相关的电力 - WLT1，WLT2和耗尽 - TTE）是评估。所有受试者均采取补充剂（13.2克碳水化合物;每剂量在每次测试和培训之前每剂量为3.2？g bcaa和1.6？g的L-丙氨酸）。在整个培训期间监测膳食习惯和训练负荷。与安慰剂（PL）相比，在回收阶段期间，在恢复阶段，在1D减少RPE的施用（SU）的施用;在冲刺和回收阶段，9w，在冲刺和回收阶段，RPE分数分别降低了13％和21％;在9W时，延长的补充剂摄入也改善了TTE和TEMP。 Su Intake总是促进BCAA血清血清水平的快速增加（1？H内），并防止了闭合后色氨酸：PL组中发现的BCAA比例增加，在1D和9W中。群体之间的饮食习惯没有差异，这些习惯随着时间的推移没有变化;苏和普尔之间发现了糖血症的差异。 VO2MAX，WLT1和WLT2值随时间而改善，但不受补充摄入量的影响。总的来说，这些结果表明I）本研究中使用的BCAA基于市售补充剂的摄入量减少了RPE作为血清色氨酸的改善的可能结果：BCAA比例; ii）随着时间的推移，减少的RPE允许受试者维持更高的工作量，导致TREM和TTE增加。

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