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Cited by 265

The DOI matches its Crossref record; 4 of the 4 references it cites were found in a registry or an index.

Effect of caffeinated drinks on substrate metabolism, caffeine excretion, and performance

Open access
Kovacs, Eva M. R., Stegen, Jos H. C. H., Brouns, Fred·1998·Journal of Applied Physiology
DOI 10.1152/jappl.1998.85.2.709
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Abstract

The effect of addition of different dosages of caffeine (Caf) to a carbohydrate-electrolyte solution (CES) on metabolism, Caf excretion, and performance was examined. Subjects ( n = 15) ingested 8 ml/kg of water placebo (Pla-W), 7% CES (Pla-CES), or 7% CES with 150, 225, and 320 mg/l Caf (CES-150, CES-225, and CES-320, respectively) during a warm-up protocol (20 min) and 3 ml/kg at one-third and two-thirds of a 1-h time trial. Performance was improved with Caf supplementation: 62.5 ± 1.3, 61.5 ± 1.1, 60.4 ± 1.0, 58.9 ± 1.0, and 58.9 ± 1.2 min for Pla-W, Pla-CES, CES-150, CES-225, and CES-320, respectively. The postexercise urinary Caf concentration (range 1.3–2.5 μg/ml) was dose dependent and always far below the doping level of the International Olympic Committee (12 μg/ml) in all subjects. Sweat Caf excretion during exercise exceeded postexercise early-void urinary Caf excretion. Caffeinated CES did not enhance free fatty acid availability, ruling out the fact that performance improvement resulted from enhanced fat oxidation. It is concluded that addition of relatively low amounts of Caf to CES improves performance and that postexercise urinary Caf concentration remained low.

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Metadata

Authors
Kovacs, E. M. R., Stegen, J. H. C. H., & Brouns, F.
Venue
Journal of Applied Physiology
Publisher
American Physiological Society
Published
1998-08-01
Volume
85
Issue
2
Pages
709-715
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
DOI
10.1152/jappl.1998.85.2.709
OpenAlex
W2132913317
Cited by
265
References
4
FWCI
1.48
Type
journal article
Language
en
Open access
bronze

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