Sodium supplementation is not required to maintain serum sodium concentrations during an Ironman triathlon

British Journal of Sports Medicine
T D Hew-ButlerT D Noakes

Abstract

Critical assessment of recommendations that athletes consume additional sodium during athletic events. To evaluate if sodium supplementation is necessary to maintain serum sodium concentrations during prolonged endurance activity and prevent the development of hyponatraemia. Prospective randomised trial of athletes receiving sodium (620 mg table salt), placebo (596 mg starch), or no supplementation during a triathlon. The sodium and placebo tablets were taken ad libitum, with the suggested range of 1-4 per hour. The 2001 Cape Town Ironman triathlon (3.8 km swim, 180 km cycle, 42.2 km run). A total of 413 triathletes completing the Ironman race. Sodium supplementation was not necessary to maintain serum sodium concentrations in athletes completing an Ironman triathlon nor required to prevent hyponatraemia from occurring in athletes who did not ingest supplemental sodium during the race. Subjects in the sodium supplementation group ingested an additional 3.6 (2.0) g (156 (88) mmol) sodium during the race (all values are mean (SD)). There were no significant differences between the sodium, placebo, and no supplementation groups with regard to age, finishing time, serum sodium concentration before and after the race, weight before ...Continue Reading

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