Below P R, Mora-Rodríguez R, González-Alonso J, Coyle E F
Department of Kinesiology and Health Education, University of Texas at Austin 78712, USA.
Med Sci Sports Exerc. 1995 Feb;27(2):200-10.
This study determined the effects of fluid and carbohydrate ingestion on performance, core temperature, and cardiovascular responses during intense exercise lasting 1 h. On four occasions, eight men cycled at 80 +/- 1% (+/- SEM) of VO2max for 50 min followed by a performance test. During exercise, they consumed either a large volume (1330 +/- 60 ml) of a 6% carbohydrate (79 +/- 4 g) solution or water or a small volume (200 +/- 10 ml) of a 40% maltodextrin (79 +/- 4 g) solution or water. These trials were pooled so the effects of fluid replacement (Large FR vs Small FR) and carbohydrate ingestion (CHO vs NO CHO) could be determined. Performance times were 6.5% faster during Large FR than Small FR and 6.3% faster during CHO than NO CHO (P < 0.05). At 50 min, heart rate was 4 +/- 1 b.min-1 lower and esophageal temperature was 0.33 +/- 0.04 degrees C lower during Large FR than Small FR (P < 0.05) but no differences occurred between CHO and NO CHO. In summary, Large FR slightly attenuates the increase in heart rate and core temperature which occurs during Small FR. Both fluid and carbohydrate ingestion equally improve cycling performance and their effects are additive.
本研究确定了在持续1小时的高强度运动期间，摄入液体和碳水化合物对运动表现、核心体温及心血管反应的影响。八名男性在四种情况下，以最大摄氧量（VO2max）的80±1%（±标准误）进行50分钟的骑行，随后进行一次运动表现测试。在运动过程中，他们分别饮用大量（1330±60毫升）含6%碳水化合物（79±4克）的溶液或水，或者少量（200±10毫升）含40%麦芽糊精（79±4克）的溶液或水。对这些试验数据进行汇总，以便确定液体补充（大量补充与少量补充）和碳水化合物摄入（碳水化合物组与无碳水化合物组）的影响。大量补充组的运动表现时间比少量补充组快6.5%，碳水化合物组比无碳水化合物组快6.3%（P<0.05）。在运动50分钟时，大量补充组的心率比少量补充组低4±1次·分钟-1，食管温度低0.33±0.04℃（P<0.05），但碳水化合物组与无碳水化合物组之间无差异。总之，大量补充可略微减弱少量补充时出现的心率和核心体温升高。摄入液体和碳水化合物均可同等程度地改善骑行表现，且二者的作用是相加的。
