Anantaraman R, Carmines A A, Gaesser G A, Weltman A
Department of Human Services, Curry School of Education, University of Virginia, Charlottesville, USA.
Int J Sports Med. 1995 Oct;16(7):461-5. doi: 10.1055/s-2007-973038.
The effects of carbohydrate supplementation on high-intensity exercise performance were examined in 5 moderately-trained subjects (age = 28.4 +/- 1.5 yr; ht = 171.0 +/- 4.3 cm; wt = 66.25 +/- 6.32 kg). High-intensity exercise tests (initiated at the power output (PO) associated with 90% VO2 peak [mean = 201 +/- 21 watts] x 60 min, with drop-off in PO allowed over time) were completed under the following randomized double blind conditions: 1) pre-exercise glucose polymer (G)/placebo during exercise (G/P), 2) G pre-exercise and during exercise (G/G), and 3) placebo pre-exercise and during exercise (P/P). Subjects ingested 300 ml of a sweetened placebo or a similarly flavored 10% G solution, immediately prior to and every 15 min during exercise. No differences were observed in PO among the 3 treatments until min 40-60 where PO was greater with G. This resulted in significantly greater total work (and less drop-off in PO) with G (G/P = 619 +/- 234kJ [14.5% lower than the value associated with 201 watts maintained for 60 min (724kJ)], G/G = 599 +/- 235 kJ [17.3% lower than the value associated with 201 watts maintained for 60 min]) compared with placebo (P/P = 560 +/- 198 kJ [22.7% drop-off in average PO]) (p < 0.05). VO2 followed a similar pattern with no difference in VO2 over min 0-40 and significantly higher VO2 in G/P and a trend for higher VO2 in G/G during min 40-60 compared to placebo. Results of the present study indicate that, compared to placebo, pre-exercise ingestion of G (30 g in 10% solution) results in less drop-off in PO during 1 hour of high-intensity exercise performance, and that no further benefit is observed when the same amount of G is also ingested every 15 min during exercise.
在5名中度训练的受试者（年龄=28.4±1.5岁；身高=171.0±4.3厘米；体重=66.25±6.32千克）中研究了补充碳水化合物对高强度运动表现的影响。高强度运动测试（从与90%最大摄氧量相关的功率输出（PO）开始[平均值=201±21瓦]，持续60分钟，允许PO随时间下降）在以下随机双盲条件下完成：1）运动前摄入葡萄糖聚合物（G）/运动期间摄入安慰剂（G/P），2）运动前和运动期间摄入G（G/G），3）运动前和运动期间摄入安慰剂（P/P）。受试者在运动前立即以及运动期间每15分钟摄入300毫升甜味安慰剂或同样口味的10%G溶液。在40 - 60分钟之前，三种处理的PO没有差异，在40 - 60分钟时G组的PO更高。这导致G组的总工作量显著更大（PO下降更少）（G/P = 619±234千焦[比与201瓦持续60分钟相关的值（724千焦）低14.5%]，G/G = 599±235千焦[比与201瓦持续60分钟相关的值低17.3%]），而安慰剂组（P/P = 560±198千焦[平均PO下降22.7%]）（p<0.05）。摄氧量遵循类似模式，在0 - 40分钟内摄氧量没有差异，在40 - 60分钟内G/P组的摄氧量显著更高，G/G组的摄氧量与安慰剂组相比有升高趋势。本研究结果表明，与安慰剂相比，运动前摄入G（10%溶液中的30克）可使高强度运动1小时期间PO的下降更少，并且在运动期间每15分钟摄入相同量的G时未观察到进一步的益处。
