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DOI: 10.1055/s-2002-29075
© Georg Thieme Verlag Stuttgart · New York
The Effect of ad libitum Ingestion of a Caffeinated Carbohydrate-Electrolyte Solution on Urinary Caffeine Concentration After 4 Hours of Endurance Exercise
Publication History
August 30, 2001
Publication Date:
14 May 2002 (online)

Abstract
The purpose of the present study was to examine the effect of ad libitum ingestion of a carbohydrate-electrolyte solution (CES) with 150 mg × L-1 caffeine (CAF) on urinary CAF concentration after 4 h of endurance exercise. Fifty-eight healthy and well-trained male subjects ingested ad libitum a 7 % CES with 150 mg × L-1 CAF during 4 h cycling at 50 % of maximal work capacity. Total fluid consumption (mean ± SE) was 2799 ± 72 mL and CAF intake was 420 ± 11 mg (5.7 ± 0.2 mg × kg-1 body weight). The post-exercise urinary CAF concentration (4.53 ± 0.25 µg × mL-1) was below the doping level of the International Olympic Committee (12 µg × mL-1) in all subjects (range 1.20 - 10.84 µg × mL-1). A highly positive correlation was observed between CAF intake and post-exercise urinary CAF concentration (r = 0.68, p < 0.001). It is concluded that ad libitum ingestion of a CES with 150 mg × L-1 CAF during 4 h cycling resulted in post-exercise urinary concentration below the doping level in all subjects.
Key words
Caffeine - carbohydrate-electrolyte solution - endurance - doping
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E. M. R. Kovacs
Department of Human Biology · Maastricht University
P.O. Box 616 · 6200 MD Maastricht · The Netherlands ·
Phone: +31 43 388 21 23
Fax: +31 43 367 09 76
Email: E.Kovacs@HB.UNIMAAS.NL