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Peer Reviewed Studies Discussion / Re: sodium and endurance
« on: December 22, 2015, 04:22:59 pm »
http://download.springer.com/static/pdf/746/art%253A10.1186%252F1550-2783-10-30.pdf?originUrl=http%3A%2F%2Fjissn.biomedcentral.com%2Farticle%2F10.1186%2F1550-2783-10-30&token2=exp=1450819623~acl=%2Fstatic%2Fpdf%2F746%2Fart%25253A10.1186%25252F1550-2783-10-30.pdf*~hmac=8293d01583054b099760ecbd617fd148cbd37bbc6c3f9f59766e535b0e87e567
Sodium supplementation has no effect on endurance performance during a cycling time-trial in cool conditions: a randomised cross-over trial
Sodium supplementation has no effect on endurance performance during a cycling time-trial in cool conditions: a randomised cross-over trial
Quote
Abstract
Background: 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).
Methods: 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.
Results: 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.
Conclusion: Sodium supplements therefore do not improving performance during exercise of approximately 3 h
duration in cool conditions.