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Br J Sports Med. 1997 Sep; 31(3): 175–182.
PMCID: PMC1332513

Factors influencing the restoration of fluid and electrolyte balance after exercise in the heat.

Abstract

Maintenance of fluid balance is a major concern for all athletes competing in events held in hot climates. This paper reviews recent work relating to optimisation of fluid replacement after sweat loss induced by exercising in the heat. Data are taken from studies undertaken in our laboratory. Issues investigated were drink composition, volume consumed, effects of consuming food with a drink, effects of alcohol in rehydration effectiveness, voluntary intake of fluid, and considerations for women related to the menstrual cycle. The results are presented as a series of summaries of experiments, followed by a discussion of the implications. The focus of this review is urine output after ingestion of a drink; fluid excreted in urine counteracts rehydration. Also included are data on the restoration of plasma volume losses. Ingestion of large volumes of plain water will inhibit thirst and will also promote a diuretic response. If effective rehydration is to be maintained for some hours after fluid ingestion, drinks should contain moderately high levels of sodium (perhaps as much as 50-60 mmol/l) and possibly also some potassium to replace losses in the sweat. To surmount ongoing obligatory urine losses, the volume consumed should be greater than the volume of sweat lost. Palatability of drinks is important in stimulating intake and ensuring adequate volume replacement. Where opportunities allow, the electrolytes required may be ingested as solid food consumed with a drink. There are no special concerns for women related to changes in hormone levels associated with the menstrual cycle. Ingestion of carbohydrate-electrolyte drinks in the post-exercise period restores exercise capacity more effectively than plain water. The effects on performance of an uncorrected fluid deficit should persuade all athletes to attempt to remain fully hydrated at all times, and the aim should be to start each bout of exercise in a fluid replete state. This will only be achieved if a volume of fluid in excess of the sweat loss is ingested together with sufficient electrolytes.

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Selected References

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  • Costill DL, Sparks KE. Rapid fluid replacement following thermal dehydration. J Appl Physiol. 1973 Mar;34(3):299–303. [PubMed]
  • González-Alonso J, Heaps CL, Coyle EF. Rehydration after exercise with common beverages and water. Int J Sports Med. 1992 Jul;13(5):399–406. [PubMed]
  • Nielsen B, Sjøgaard G, Ugelvig J, Knudsen B, Dohlmann B. Fluid balance in exercise dehydration and rehydration with different glucose-electrolyte drinks. Eur J Appl Physiol Occup Physiol. 1986;55(3):318–325. [PubMed]
  • Coyle EF, Coggan AR. Effectiveness of carbohydrate feeding in delaying fatigue during prolonged exercise. Sports Med. 1984 Nov-Dec;1(6):446–458. [PubMed]
  • Lamb DR, Brodowicz GR. Optimal use of fluids of varying formulations to minimise exercise-induced disturbances in homeostasis. Sports Med. 1986 Jul-Aug;3(4):247–274. [PubMed]
  • Murray R. The effects of consuming carbohydrate-electrolyte beverages on gastric emptying and fluid absorption during and following exercise. Sports Med. 1987 Sep-Oct;4(5):322–351. [PubMed]
  • Maughan RJ, Leiper JB. Sodium intake and post-exercise rehydration in man. Eur J Appl Physiol Occup Physiol. 1995;71(4):311–319. [PubMed]
  • Dill DB, Costill DL. Calculation of percentage changes in volumes of blood, plasma, and red cells in dehydration. J Appl Physiol. 1974 Aug;37(2):247–248. [PubMed]
  • Maughan RJ, Owen JH, Shirreffs SM, Leiper JB. Post-exercise rehydration in man: effects of electrolyte addition to ingested fluids. Eur J Appl Physiol Occup Physiol. 1994;69(3):209–215. [PubMed]
  • Shirreffs SM, Taylor AJ, Leiper JB, Maughan RJ. Post-exercise rehydration in man: effects of volume consumed and drink sodium content. Med Sci Sports Exerc. 1996 Oct;28(10):1260–1271. [PubMed]
  • Maughan RJ, Leiper JB, Shirreffs SM. Restoration of fluid balance after exercise-induced dehydration: effects of food and fluid intake. Eur J Appl Physiol Occup Physiol. 1996;73(3-4):317–325. [PubMed]
  • Maughan RJ, McArthur M, Shirreffs SM. Influence of menstrual status on fluid replacement after exercise induced dehydration in healthy young women. Br J Sports Med. 1996 Mar;30(1):41–47. [PMC free article] [PubMed]
  • Bergeron MF. Heat cramps during tennis: a case report. Int J Sport Nutr. 1996 Mar;6(1):62–68. [PubMed]
  • Recommendations for composition of oral rehydration solutions for the children of Europe. Report of an ESPGAN Working Group. J Pediatr Gastroenterol Nutr. 1992 Jan;14(1):113–115. [PubMed]
  • Nose H, Mack GW, Shi XR, Nadel ER. Role of osmolality and plasma volume during rehydration in humans. J Appl Physiol (1985) 1988 Jul;65(1):325–331. [PubMed]

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