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首页> 外文期刊>Medicine and science in sports and exercise >Effects of preexercise carbohydrate ingestion on mountain bike performance.
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Effects of preexercise carbohydrate ingestion on mountain bike performance.

机译：运动前摄入碳水化合物对山地自行车性能的影响。

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PURPOSE: This study examined the performance and metabolic effects of consuming 1.0 (LC) and 3.0 (HC) grams of carbohydrate (CHO) per kilogram body mass (BM), 3 h before a 93-min simulated mountain bike race. METHODS: After two familiarization trials, eight male subjects undertook two CHO trials in a double-blind counterbalanced fashion on a cycle ergometer. The HC meal was supplemented with maltodextrin while maintaining the same glycemic index and apparent volume of food as the LC meal. Stochastic cycling was undertaken for 93 min (4 x 22.50-min laps) with performance measured as the total work performed in 6 x 30-s periods each lap during the test. RESULTS: Performance in lap 1 was better with LC (P < 0.03) whereas performance in lap 4 was better with HC (P < 0.02). Overall performance was 3% greater in HC compared with LC (NS, P = 0.13). Serum glucose was significantly lower (P < 0.04) in HC immediately before the mountain bike test (180 min postprandial) and at 10 min into the test (P < 0.01). Gastrointestinal comfort decreased similarly for both trials over time (P < 0.05). CONCLUSION: These data suggest that ingestion of 3.0 g x kg(-1) BM of CHO 3 h before a 93-min mountain bike simulated race does not produce a statistically significant improvement in overall performance compared with 1.0 g x kg(-1) BM. However, in real terms, a 3% performance improvement may benefit athletes in a race situation. Differences in performance during the first and last laps indicate a variation in pacing strategies that may have resulted from differing blood glucose levels between trials.
机译：目的：这项研究检查了在93分钟的模拟山地自行车比赛前3小时每公斤体重（BM）消耗1.0（LC）和3.0（HC）克碳水化合物（CHO）的性能和代谢作用。方法：经过两次熟悉试验，八名男性受试者在自行车测功机上以双盲平衡方式进行了两次CHO试验。 HC膳食补充了麦芽糖糊精，同时保持了与LC膳食相同的血糖指数和食物表观体积。进行了93分钟（4 x 22.50-min圈）的随机骑行，性能测得是在测试过程中每圈6 x 30-s周期内完成的总功。结果：LC组在第1圈的表现更好（P <0.03），而HC组在第4圈的表现更好（P <0.02）。与LC相比，HC的总体性能要高3％（NS，P = 0.13）。在山地自行车测试之前（餐后180分钟）和测试开始10分钟时，HC中的血清葡萄糖显着降低（P <0.04）。两项试验的胃肠舒适度均随时间下降（P <0.05）。结论：这些数据表明，在进行93分钟的山地自行车模拟比赛之前3 h，摄入3.0 g x kg（-1）BM的CHO与1.0 g x kg（-1）BM相比，在总体表现上没有统计学上的显着改善。但是，实际上，性能提高3％可能会使运动员在比赛中受益。在第一和最后一圈的表现差异表明起搏策略的变化，这可能是由于两次试验之间的血糖水平不同所致。

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