High oxidation rates from combined carbohydrates ingested during exercise
High oxidation rates from combined carbohydrates ingested during exercise
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DOI：
10.1249/01.mss.0000139796.07843.1d
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发表时间：
2004-09-01
期刊：
影响因子：
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通讯作者：
Jeukendrup, AE
中科院分区：
文献类型：
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作者：
Jentjens, RLPG;Achten, J;Jeukendrup, AE
研究运动期间单一碳水化合物 (CHO) 氧化情况的研究报告称氧化率高达 1 g(.)min(-1)。我们实验室最近的研究表明，与摄入等热量的葡萄糖相比，以高速率（1.8 g(.)min(-1)）摄入葡萄糖和蔗糖或葡萄糖和果糖的混合物会导致类似于 1.3 g(.)min(-1) 的峰值氧化速率，并导致外源 CHO 氧化速率高出 20% 至 55%。目的：本研究的目的是检验高速摄入葡萄糖、蔗糖和果糖的混合物是否会导致更高的外源性 CHO 氧化率（> 1.3 g(.)min(-1)）。方法：八名训练有素的男性自行车手（最大摄氧量：64 +/- 1 mL(.)kg(-1) BM(.)min(-1)）在三种不同的场合以 62 +/- 1 % 最大摄氧量骑行 150 分钟，消耗水 (WAT) 或 CHO 溶液，提供 2.4 g(.)min(-1) 葡萄糖 (GLU) 或 1.2 g(.)min(-1) 葡萄糖 + 0.6 g(.)min(-1) 果糖 + 0.6 g(.)min(-1) 蔗糖 (MIX)。结果：MIX 试验中发现外源 CHO 氧化速率峰值 (1.70 +/- 0.07 g(.)min(-1))，与 GLU 试验 (1.18 +/- 0.04 g(.)min(-1)) 相比高出 44% (P < 0.01)。与 GLU 相比，MIX 中的内源 CHO 氧化较低（P < 0.05）（分别为 0.76 +/- 0.12 和 1.05 +/- 0.06 g(.)min(-1)）。结论：当自行车运动期间同时高速率摄入葡萄糖、果糖和蔗糖（2.4 g(.)min(-1)）时，外源性CHO氧化速率可达到类似于1.7g(.)min(-1)的峰值，并且与摄入等热量的葡萄糖相比，估计的内源性CHO氧化减少。
Studies that have investigated oxidation of a single carbohydrate (CHO) during exercise have reported oxidation rates of up to 1 g(.)min(-1). Recent studies from our laboratory have shown that a mixture of glucose and sucrose or glucose and fructose ingested at a high rate (1.8 g(.)min(-1)) leads to peak oxidation rates of similar to 1.3 g(.)min(-1) and results in similar to20 to 55% higher exogenous CHO oxidation rates compared with the ingestion of an isocaloric amount of glucose. Purpose: The purpose of the present study was to examine whether a mixture of glucose, sucrose and fructose ingested at a high rate would result in even higher exogenous CHO oxidation rates (> 1.3 g(.)min(-1)). Methods: Eight trained male cyclists (VO2max: 64 +/- 1 mL(.)kg(-1) BM(.)min(-1)) cycled on three different occasions for 150 min at 62 +/- 1 % VO2max and consumed either water (WAT) or a CHO solution providing 2.4 g(.)min(-1) of glucose (GLU) or 1.2 g(.)min(-1) of glucose + 0.6 g(.)min(-1) of fructose + 0.6 g(.)min(-1) of sucrose (MIX). Results: High peak exogenous CHO oxidation rates were found in the MIX trial (1.70 +/- 0.07 g(.)min(-1)), which were similar to44% higher (P < 0.01) compared with the GLU trial (1.18 +/- 0.04 g(.)min(-1)). Endogenous CHO oxidation was lower (P < 0.05) in MIX compared with GLU (0.76 +/- 0.12 and 1.05 +/- 0.06 g(.)min(-1), respectively). Conclusion: When glucose, fructose and sucrose are ingested simultaneously at high rates (2.4 g(.)min(-1)) during cycling exercise, exogenous CHO oxidation rates can reach peak values of similar to 1.7 g(.)min(-1) and estimated endogenous CHO oxidation is reduced compared with the ingestion of an isocaloric amount of glucose.