Caffeine and diuresis during rest and exercise: A meta-analysis
Zhang Y, Coca A, Casa DJ, Antonio J, Green JM, Bishop PA
Journal of science and medicine in sport · 44 citas
Cómo se estudió
- Diseño
- Metaanálisis (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación independiente
- Universidad u hospital
- Georgia State University
- Gobierno
- National Institutes of Health
- Gobierno
- U.S. Food and Drug Administration
- Gobierno
- Intramural CDC HHS
- Subvenciones
- National Institutes of Health (CC999999)
Según 4 financiadores declarados.
Publicación
- Publicado
- 2014-08-09 · J Sci Med Sport · vol. 18 · número 5 · págs. 569–574
- Editorial
- Elsevier BV
- Citado
- 94 citas · más que el 61% de estudios similares · 0.7× el promedio de su campo
- Referencias
- 46 trabajos
- Acceso
- Acceso abierto (copia en repositorio)
- Áreas de investigación
- Coffee research and impacts · Thermoregulation and physiological responses · Exercise and Physiological Responses
- Palabras clave
- caffeine, diuresis, urine output, physical activity, fluid balance, ergogenic aids, sex differences, fluid loss, acute caffeine ingestion
- MeSH
- humans, caffeine, central nervous system stimulants, exercise, models, statistical, water-electrolyte balance, diuresis, rest, adult, female, male
6 autores
- Yang Zhang · autor de correspondencia
- Aitor Coca🇺🇸Centers for Disease Control and Prevention; National Institute for Occupational Safety and Health
- Douglas J. Casa🇺🇸University of Connecticut
- José António🇺🇸Nova Southeastern University
- James M. Green🇺🇸University of North Alabama
- Phillip A. Bishop🇺🇸University of Alabama
Resumen
El texto original del estudio, en el idioma en que se publicó.
Objectives
Although ergogenic, acute caffeine ingestion may increase urine volume, prompting concerns about fluid balance during exercise and sport events. This meta-analysis evaluated caffeine induced diuresis in adults during rest and exercise.
Design
Meta-analysis.
Methods
A search of three databases was completed on November 1, 2013. Only studies that involved healthy adults and provided sufficient information concerning the effect size (ES) of caffeine ingestion on urine volume were included. Sixteen studies met the inclusion criteria, providing a total of 28 ESs for the meta-analysis. Heterogeneity was assessed using a random-effects model.
Results
The median caffeine dosage was 300 mg. The overall ES of 0.29 (95% confidence interval (CI) = 0.11-0.48, p = 0.001) corresponds to an increase in urine volume of 109 ± 195 mL or 16.0 ± 19.2% for caffeine ingestion vs. non-caffeine conditions. Subgroup meta-analysis confirmed exercise as a strong moderator: active ES = 0.10, 95% CI = -0.07 to 0.27, p = 0.248 vs. resting ES = 0.54, 95% CI = 0.22-0.85, p = 0.001 (Cochran's Q, p = 0.019). Females (ES = 0.75, 95% CI = 0.38-1.13, p < 0.001) were more susceptible to diuretic effects than males (ES = 0.13, 95% CI = -0.05 to 0.31, p = 0.158) (Cochran's Q, p = 0.003).
Conclusions
Caffeine exerted a minor diuretic effect which was negated by exercise. Concerns regarding unwanted fluid loss associated with caffeine consumption are unwarranted particularly when ingestion precedes exercise.
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