Dept. of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.
Int J Sport Nutr Exerc Metab. 2010 Aug;20(4):322-9. doi: 10.1123/ijsnem.20.4.322.
This study examined whether acute taurine (T) ingestion before prolonged cycling would improve time-trial (TT) performance and alter whole-body fuel utilization compared with a control (CON) trial and a placebo (PL) trial in which participants were told they received taurine but did not. Eleven endurance-trained male cyclists (27.2 ± 1.5 yr, 74.3 ± 2.3 kg, 59.9 ± 2.3 ml · kg⁻¹ · min⁻¹; M ± SEM) completed 3 trials in a randomized, crossover, blinded design in which they consumed a noncaloric sweetened beverage with either 1.66 g of T or nothing added (CON, PL) 1 hr before exercise. Participants then cycled at 66.5% ± 1.9% VO(2max) for 90 min followed immediately by a TT (doing 5 kJ of work/kg body mass as fast as possible). Data on fluid administration, expired gas, heart rate, and ratings of perceived exertion were collected at 15-min intervals during the 90-min cycling ride, but there were no differences recorded between trials. There was no difference in TT performance between any of the 3 trials (1,500 ± 87 s). Average carbohydrate (T 2.73 ± 0.21, CON 2.88 ± 0.19, PL 2.89 ± 0.20 g/min) and fat (T 0.45 ± 0.05, CON 0.39 ± 0.04, PL 0.39 ± 0.05 g/min) oxidation rates were unaffected by T supplementation. T ingestion resulted in a 16% increase (5 g, ~84 kJ; p < .05) in total fat oxidation over the 90-min exercise period compared with CON and PL. The acute ingestion of 1.66 g of T before exercise did not enhance TT performance but did result in a small but significant increase in fat oxidation during submaximal cycling in endurance-trained cyclists.
这项研究考察了在长时间骑行前急性摄入牛磺酸（T）是否会改善计时赛（TT）表现，并与对照（CON）试验和安慰剂（PL）试验相比改变全身燃料利用，在这些试验中，参与者被告知他们接受了牛磺酸，但实际上并没有。11 名耐力训练的男性自行车手（27.2 ± 1.5 岁，74.3 ± 2.3 公斤，59.9 ± 2.3 ml·kg-1·min-1；M ± SEM）以随机、交叉、盲法设计完成了 3 项试验，他们在运动前 1 小时饮用含有 1.66 克 T 或不添加任何物质的无热量甜味饮料（CON、PL）。然后，参与者以 66.5% ± 1.9% VO2max 的速度骑行 90 分钟，然后立即进行 TT（以尽可能快的速度完成 5 kJ/kg 体重的工作）。在 90 分钟的骑行过程中，每隔 15 分钟收集有关液体摄入、呼出气体、心率和感知用力的评分的数据，但试验之间没有记录到差异。3 项试验中的 TT 表现没有差异（1500 ± 87 s）。平均碳水化合物（T 2.73 ± 0.21，CON 2.88 ± 0.19，PL 2.89 ± 0.20 g/min）和脂肪（T 0.45 ± 0.05，CON 0.39 ± 0.04，PL 0.39 ± 0.05 g/min）氧化率不受 T 补充的影响。与 CON 和 PL 相比，T 摄入使运动期间的总脂肪氧化增加了 16%（5 克，约 84 kJ；p <.05）。在耐力训练的自行车手进行亚最大强度的骑行期间，运动前急性摄入 1.66 克 T 虽然没有提高 TT 表现，但确实导致脂肪氧化的微小但显著增加。
