The DOI matches its Crossref record; 155 of the 155 references it cites were found in a registry or an index.
Fluid and fuel intake during exercise
Abstract
The amounts of water, carbohydrate and salt that athletes are advised to ingest during exercise are based upon their effectiveness in attenuating both fatigue as well as illness due to hyperthermia, dehydration or hyperhydration. When possible, fluid should be ingested at rates that most closely match sweating rate. When that is not possible or practical or sufficiently ergogenic, some athletes might tolerate body water losses amounting to 2% of body weight without significant risk to physical well-being or performance when the environment is cold (e.g. 5-10 degrees C) or temperate (e.g. 21-22 degrees C). However, when exercising in a hot environment ( > 30 degrees C), dehydration by 2% of body weight impairs absolute power production and predisposes individuals to heat injury. Fluid should not be ingested at rates in excess of sweating rate and thus body water and weight should not increase during exercise. Fatigue can be reduced by adding carbohydrate to the fluids consumed so that 30-60 g of rapidly absorbed carbohydrate are ingested throughout each hour of an athletic event. Furthermore, sodium should be included in fluids consumed during exercise lasting longer than 2 h or by individuals during any event that stimulates heavy sodium loss (more than 3-4 g of sodium). Athletes do not benefit by ingesting glycerol, amino acids or alleged precursors of neurotransmitter. Ingestion of other substances during exercise, with the possible exception of caffeine, is discouraged. Athletes will benefit the most by tailoring their individual needs for water, carbohydrate and salt to the specific challenges of their sport, especially considering the environment's impact on sweating and heat stress.
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“almost immediate reductions in cognitive performance occur when blood glucose concentrations fall below 3.4 mmol·L -1 46-55”
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Metadata
- Authors
- Coyle, E. F.
- Affiliations
- The University of Texas at Austin (US)
- Corresponding author
- Coyle, Edward F
- ORCID
- Coyle, Edward F
- Venue
- Journal of Sports Sciences
- Publisher
- Informa UK Limited
- Published
- 2004-01
- Volume
- 22
- Issue
- 1
- Pages
- 39-55
- ISSN
- 0264-0414 (ISSN-L)
- 1466-447X
- OpenAlex
- W2145009312
- Cited by
- 423
- References
- 154
- Citations by year
- 2026: 7 · 2025: 6 · 2024: 3 · 2023: 8 · 2022: 9 · 2021: 12 · 2020: 11 · 2019: 14 · 2018: 15 · 2017: 15 · 2016: 13 · 2015: 21 · 2014: 36 · 2013: 29 · 2012: 31
- FWCI
- 7.75
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Sports Sciences (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Physiology (medical) › Thermoregulation and physiological responses
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
- Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
- Keywords
- fluid intake, carbohydrate intake, sodium intake, dehydration, hyperthermia, sweat rate, heat injury, fatigue, endurance exercise, hot environment, cold environment, caffeine, glycerol, amino acids, electrolyte replacement
- MeSH terms
- Body Temperature Regulation, Dehydration, Dietary Carbohydrates, Fluid Therapy, Gastric Emptying, Humans, Nutritional Physiological Phenomena, Physical Endurance, Time Factors, Exercise, Rehydration Solutions, Muscle Fatigue
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