School of Sport and Exercise Sciences, University of Birmingham, Edgbaston, Birmingham, UNITED KINGDOM.
Med Sci Sports Exerc. 2011 Feb;43(2):327-34. doi: 10.1249/MSS.0b013e3181ebc488.
Current recommendations for CHO intake in the field for all modes of endurance exercise are largely on the basis of laboratory studies that measured oxidation of ingested CHO. However, the majority of these laboratory studies used cycling as the mode of exercise, and it is not known whether these results can be extrapolated to running.
the purpose of this study was to investigate exogenous CHO oxidation from a CHO drink during moderate-intensity running (RUN) compared with cycling (CYCLE).
eight athletes with comparable CYCLE and RUN training backgrounds (mean ± SD: age = 37 ± 7 yr, weight = 75 ± 7 kg, height = 1.77 ± 0.05 m; V˙O2max CYCLE = 63 ± 3 mL·kg·min, V˙O2max RUN = 65 ± 4 mL·kg·min) performed four exercise trials in random order. The trials consisted of either running or cycling at approximately 60% of the exercise specific V˙O2max for 120 min while receiving either a CHO drink (2:1 glucose-fructose blend; 1.5 g·min) or a similar volume of plain water (WAT; 675 mL·h).
the set workload elicited similar relative exercise intensities of 59.7% ± 2.0% and 59.2% ± 1.9% V˙O2max for RUN and CYCLE, respectively. Peak and average exogenous CHO oxidation rates were not significantly different between RUN and CYCLE trials and showed a similar time course (peak at 120 min = 1.25 ± 0.10 vs 1.19 ± 0.08 g·min, respectively, P = 0.13; average over final hour = 1.14 ± 0.10 and 1.11 ± 0.11 g·min, respectively, P = 0.94). Furthermore, total fat oxidation rates were higher during RUN compared with CYCLE. The difference was significant with ingestion of WAT (P = 0.02) and failed to reach statistical significance with CHO (P = 0.09).
this study demonstrates that exogenous CHO oxidation rates are similar between prolonged running and cycling at a similar relative moderate intensity. These data suggest that previous exogenous CHO oxidation results from cycling studies can be extrapolated to running.
目前针对所有耐力运动模式的 CHO 摄入量的建议主要基于测量摄入的 CHO 氧化的实验室研究。然而，这些实验室研究大多数使用骑自行车作为运动模式，尚不清楚这些结果是否可以外推到跑步。
本研究旨在比较中等强度跑步（RUN）与骑自行车（CYCLE）时，来自 CHO 饮料的外源性 CHO 氧化。
8 名具有相似 CYCLE 和 RUN 训练背景的运动员（平均值±SD：年龄=37±7 岁，体重=75±7 公斤，身高=1.77±0.05 米；CYCLE 的 V˙O2max=63±3 mL·kg·min，RUN 的 V˙O2max=65±4 mL·kg·min）以随机顺序进行了 4 次运动试验。这些试验包括以大约 60%的特定于运动的 V˙O2max 进行 120 分钟的跑步或骑自行车，同时接受 CHO 饮料（2:1 葡萄糖-果糖混合物；1.5 g·min）或相同体积的普通水（WAT；675 mL·h）。
设定的工作量引起了类似的相对运动强度，分别为 RUN 和 CYCLE 的 59.7%±2.0%和 59.2%±1.9%的 V˙O2max。RUN 和 CYCLE 试验中外源 CHO 氧化的峰值和平均速率没有显著差异，呈现出相似的时间过程（峰值在 120 分钟时分别为 1.25±0.10 和 1.19±0.08 g·min，P=0.13；最后 1 小时的平均值分别为 1.14±0.10 和 1.11±0.11 g·min，P=0.94）。此外，与 CYCLE 相比，RUN 时总脂肪氧化率更高。在用 WAT 摄入时，这种差异具有统计学意义（P=0.02），而在用 CHO 时则未达到统计学意义（P=0.09）。
本研究表明，在相似的相对适度强度下，长时间跑步和骑自行车的外源性 CHO 氧化率相似。这些数据表明，以前来自骑自行车研究的外源性 CHO 氧化结果可以外推到跑步。
