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

journal contribution
posted on 2023-05-17, 12:43 authored by Armstrong, LE, Pumerantz, AC, Roti, MW, Judelson, DA, Greig Watson, Dias, G, Sokmen, B, Casa, DJ, Maresh, CM
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.

History

Publication title

International Journal of Sport Nutrition and Exercise Metabolism

Volume

2005 Jun

Issue

15(3)

Pagination

252-65

ISSN

1526-484X

Department/School

School of Health Sciences

Publisher

Champaign, IL : Human Kinetics Publishers, c2000

Place of publication

United States

Repository Status

  • Restricted

Socio-economic Objectives

Evaluation of health and support services not elsewhere classified

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