文章基本信息

标题：Sodium supplementation has no effect on endurance performance during a cycling time-trial in cool conditions: a randomised cross-over trial
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作者：Samuel David Cosgrove ; Katherine Elizabeth Black
期刊名称：Journal of the International Society of Sports Nutrition
电子版ISSN：1550-2783
出版年度：2013
卷号：10
期号：1
页码：30
DOI：10.1186/1550-2783-10-30
语种：English
出版社：BioMed Central
摘要：Sodium ingestion during exercise may exert beneficial effects on endurance performance by either its ability to attenuate the decrease in plasma volume or reduce the risk of Exercise Associated Hyponatremia (EAH). This study aimed to investigate the effect of sodium supplements on endurance performance during a 72 km road cycling time-trial in cool conditions (13.8 ± 2.0°C). Nine well-trained cyclists (5 male, 4 female) participated in this randomized, double-blinded cross-over study, receiving either a 700 mg.h-1 salt capsule, or a corn flour placebo during the time trial. Water was ingested ad-libitum throughout the time trial. Measurements were taken pre, post, and 40 min following time-trials, analysing blood, sweat, and urinary hydration and sodium concentration. Sodium supplements had no effect on time-trial performance (overall time = 171 min sodium vs. 172 min placebo; p = 0.46). There was also no effect on the change in plasma sodium concentration from pre to post time trial between trials (relative plasma [Na+] change (pre-post): sodium = 0.56%, placebo = 0.47%; p = 0.60). The greatest difference observed was a significantly change in plasma volume from pre to post exercise between the salt and the placebo trial (p = 0.02), which corresponded with an increased thirst with sodium supplementation. Sodium supplements therefore do not improving performance during exercise of approximately 3 h duration in cool conditions.
关键词：Sodium ; Salt ; Hyponatremia ; Endurance exercise ; Hydration ; Fluid balance ; Thirst