Abstract
The confusion about sports drinks is lessened if the types are understood. Types include: fluid replacers, carbohydrate loaders, and nutrient supplements. The athletic activity and the timing of the consumption of the drink need to complement the type of drink. Fluid replacement is a must before, during, and after activity to maintain heart rate and body temperature. Whether water or a sports drink is consumed is the athlete's choice. The carbohydrate concentration of a fluid-replacing drink should not exceed 10%, which is comparable to the gastric emptying characteristics of water. Glucose, sucrose, and glucose polymers are all well tolerated by athletes during activity, although fructose in high concentrations may not be. Electrolytes are present in drinks to enhance absorption; high levels usually are not needed, except in certain populations.
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Selected References
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- Costill D. L., Saltin B. Factors limiting gastric emptying during rest and exercise. J Appl Physiol. 1974 Nov;37(5):679–683. doi: 10.1152/jappl.1974.37.5.679. [DOI] [PubMed] [Google Scholar]
- Flynn M. G., Costill D. L., Hawley J. A., Fink W. J., Neufer P. D., Fielding R. A., Sleeper M. D. Influence of selected carbohydrate drinks on cycling performance and glycogen use. Med Sci Sports Exerc. 1987 Feb;19(1):37–40. [PubMed] [Google Scholar]
- Foster C., Costill D. L., Fink W. J. Gastric emptying characteristics of glucose and glucose polymer solutions. Res Q Exerc Sport. 1980 May;51(2):299–305. doi: 10.1080/02701367.1980.10605198. [DOI] [PubMed] [Google Scholar]
- Ivy J. L., Costill D. L., Fink W. J., Lower R. W. Influence of caffeine and carbohydrate feedings on endurance performance. Med Sci Sports. 1979 Spring;11(1):6–11. [PubMed] [Google Scholar]
- Ivy J. L., Miller W., Dover V., Goodyear L. G., Sherman W. M., Farrell S., Williams H. Endurance improved by ingestion of a glucose polymer supplement. Med Sci Sports Exerc. 1983;15(6):466–471. [PubMed] [Google Scholar]
- Mitchell J. B., Costill D. L., Houmard J. A., Flynn M. G., Fink W. J., Beltz J. D. Effects of carbohydrate ingestion on gastric emptying and exercise performance. Med Sci Sports Exerc. 1988 Apr;20(2):110–115. doi: 10.1249/00005768-198820020-00002. [DOI] [PubMed] [Google Scholar]
- 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. doi: 10.2165/00007256-198704050-00002. [DOI] [PubMed] [Google Scholar]
- Seiple R. S., Vivian V. M., Fox E. L., Bartels R. L. Gastric-emptying characteristics of two glucose polymer-electrolyte solutions. Med Sci Sports Exerc. 1983;15(5):366–369. [PubMed] [Google Scholar]