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Fluid, electrolyte, and renal indices of hydration during 11 days of controlled caffeine consumption

Citation

Armstrong, LE and Pumerantz, AC and Roti, MW and Judelson, DA and Watson, G and Dias, G and Sokmen, B and Casa, DJ and Maresh, CM, Fluid, electrolyte, and renal indices of hydration during 11 days of controlled caffeine consumption, International Journal of Sport Nutrition and Exercise Metabolism, 2005 Jun, (15(3)) pp. 252-65. ISSN 1526-484X (2005) [Refereed Article]

Abstract

This investigation determined if 3 levels of controlled caffeine consumption affected fluid-electrolyte balance and renal function differently. Healthy males (mean +/- standard deviation; age, 21.6 +/- 3.3 y) consumed 3 mg caffeine . kg(-1) . d(-1). on days 1 to 6 (equilibration phase). On days 7 to 11 (treatment phase), subjects consumed either 0 mg (C0; placebo; n= 20), 3 mg (C3; n = 20), or 6 mg (C6; n = 19) caffeine . kg(-1) . d(-1) in capsules, with no other dietary caffeine intake. The following variables were unaffected (P > 0.05) by different caffeine doses on days 1, 3, 6, 9, and 11 and were within normal clinical ranges: body mass, urine osmolality, urine specific gravity, urine color, 24-h urine volume, 24-h Na+ and K+ excretion, 24-h creatinine, blood urea nitrogen, serum Na+ and K+, serum osmolality, hematocrit, and total plasma protein. Therefore, C0, C3, and C6 exhibited no evidence of hypohydration. These findings question the widely accepted notion that caffeine consumption acts chronically as a diuretic.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Human Movement and Sports Science
Research Field:Exercise Physiology
Objective Division:Health
Objective Group:Health and Support Services
Objective Field:Health and Support Services not elsewhere classified
Author:Watson, G (Dr Greig Watson)
ID Code:78859
Year Published:2005
Deposited By:Health Sciences A
Deposited On:2012-07-30
Last Modified:2012-07-30
Downloads:0

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