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首页> 外文期刊>Medicine and science in sports and exercise >Substrate metabolism and exercise performance with caffeine and carbohydrate intake.
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Substrate metabolism and exercise performance with caffeine and carbohydrate intake.

机译：摄取咖啡因和碳水化合物会影响底物的代谢和运动表现。

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PURPOSE: 1) To investigate the effect of caffeine on exogenous carbohydrate (CHO) oxidation and glucose kinetics during exercise; and 2) to determine whether combined ingestion of caffeine and CHO enhanced cycling performance compared with CHO alone. METHODS: Ten endurance-trained cyclists performed three experimental trials consisting of 105 min steady-state (SS) cycling at 62% VO2max followed by a time trial (TT) lasting approximately 45 min. During exercise, subjects ingested either of the following: a 6.4% glucose solution (GLU), a 6.4% glucose plus caffeine solution providing 5.3 mg kg(-1) of caffeine (GLU + CAF), or a placebo (PLA). Glucose solutions contained a trace amount of [U-C]glucose, and eight subjects received a primed continuous [6,6-H2]glucose infusion. RESULTS: Peak exogenous CHO oxidation rates were not significantly different between GLU and GLU + CAF trials (52.6 +/- 2.7 and 49.1 +/- 2.1 micromol kg.min(-1), respectively). Rates of appearance (Ra) and disappearance (Rd) of glucose were significantly higher with CHO ingestion than PLA (P < 0.01) but were not significantly different between GLU and GLU + CAF trials. Performance times were 43.45 +/- 0.86, 45.45 +/- 1.07, and 47.40 +/- 1.30 min for GLU + CAF, GLU, and PLA, respectively. Therefore, GLU + CAF ingestion enhanced TT performance by 4.6% (P < 0.05) compared with GLU and 9% (P < 0.05) compared with PLA. CONCLUSION: The coingestion of caffeine (5.3 mg kg(-1)) with CHO during exercise enhanced TT performance by 4.6% compared with CHO and 9.0% compared with water placebo. However, caffeine did not influence exogenous CHO oxidation or glucose kinetics during SS exercise.
机译：目的：1）研究咖啡因对运动过程中外源碳水化合物（CHO）氧化和葡萄糖动力学的影响; 2）确定咖啡因和CHO的联合摄入是否比单独的CHO增强了骑自行车的性能。方法：十名耐力训练的骑自行车者进行了三项实验性试验，包括以62％VO2max进行105分钟的稳态（SS）骑行，然后进行持续约45分钟的时间试验（TT）。运动期间，受试者摄入以下任何一种：6.4％葡萄糖溶液（GLU），6.4％葡萄糖加咖啡因溶液，可提供5.3 mg kg（-1）的咖啡因（GLU + CAF）或安慰剂（PLA）。葡萄糖溶液中含有痕量的[U-C]葡萄糖，八名受试者接受了灌注的连续[6,6-H2]葡萄糖输注。结果：GLU和GLU + CAF试验之间的峰值外源CHO氧化速率无显着差异（分别为52.6 +/- 2.7和49.1 +/- 2.1 micromol kg.min（-1））。 CHO摄入后，葡萄糖的出现率（Ra）和消失率（Rd）明显高于PLA（P <0.01），但在GLU和GLU + CAF试验之间无显着差异。 GLU + CAF，GLU和PLA的性能时间分别为43.45 +/- 0.86、45.45 +/- 1.07和47.40 +/- 1.30分钟。因此，GLU + CAF摄入使TT性能比GLU提高了4.6％（P <0.05），与PLA相比提高了9％（P <0.05）。结论：运动期间咖啡因（5.3 mg kg（-1））与CHO共同摄入可使TT性能比CHO高4.6％，与水安慰剂相比提高9.0％。但是，咖啡因在SS运动期间不会影响外源CHO氧化或葡萄糖动力学。

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