Bordoli Claire, Varley Ian, Sharpe Graham R, Johnson Michael A, Hennis Philip J
Sport, Health and Performance Enhancement (SHAPE) Research Centre, Nottingham Trent University, Clifton Lane, Clifton, Nottingham NG11 8NS, UK.
J Funct Morphol Kinesiol. 2024 Aug 20;9(3):139. doi: 10.3390/jfmk9030139.
Lactate is an important energy intermediate and metabolic buffer, and may be ergogenic. We investigated if lactate supplementation is an effective approach to enhance the exercise performance and acid-base balance of trained cyclists during exercise devised to simulate the demands of endurance road race cycling. Sixteen endurance-trained male cyclists (V·O 59 ± 7 mL·kg·min) consumed 120 mg·kg body mass of lactate or a placebo 70 min prior to performing an exercise performance test, comprising five repeated blocks consisting of 1 km and 4 km time trials interspersed with 10 min of moderate-intensity exercise. Blood acid-base balance (including [H] and [HCO]), heart rate, perceived exertion, and gastro-intestinal tolerance were assessed. There was no effect of lactate supplementation on exercise performance ( = 0.320), despite a reduction in RPE ( = 0.012) and increases in [SID] ( = 0.026) and [HCO] ( = 0.041). In addition, gastro-intestinal side effects were observed, but there was no effect on heart rate. Lactate supplementation did not improve exercise performance, despite positive changes in acid-base balance and RPE. This suggests that the alkalising effects of the supplement can reduce perceived effort, but these benefits do not translate into performance improvements.
乳酸是一种重要的能量中间体和代谢缓冲物质，可能具有提高运动能力的作用。我们研究了补充乳酸是否是一种有效的方法，可在模拟耐力公路自行车赛需求的运动中提高训练有素的自行车运动员的运动表现和酸碱平衡。16名耐力训练的男性自行车运动员（最大摄氧量59±7 mL·kg·min）在进行运动表现测试前70分钟，摄入120 mg·kg体重的乳酸或安慰剂，该测试包括五个重复的组块，由1公里和4公里的计时赛组成，中间穿插10分钟的中等强度运动。评估了血液酸碱平衡（包括[H⁺]和[HCO₃⁻]）、心率、主观用力程度和胃肠道耐受性。尽管补充乳酸后主观用力程度降低（P = 0.012）、强离子差增加（P = 0.026）和[HCO₃⁻]增加（P = 0.041），但对运动表现没有影响（P = 0.320）。此外，观察到胃肠道副作用，但对心率没有影响。尽管酸碱平衡和主观用力程度有积极变化，但补充乳酸并未改善运动表现。这表明补充剂的碱化作用可降低主观用力感，但这些益处并未转化为运动表现的提高。
