The effect of ad libitum ingestion of a caffeinated carbohydrate-electrolyte solution on urinary caffeine concentration after 4 hours of endurance exercise
Deutscher übersetzter Titel: | Die Auswirkungen der Einnahme ad libitum von koffeinhaltigen Kohlenhydrat-Elektrolyt-Getränken auf die Koffeinkonzentration im Urin nach 4 Stunden Ausdauertraining |
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Autor: | Kovacs, E.M.R.; Martin, A.M.; Brouns, F. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 23 (2002), 4, S. 237-241, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-2002-29075 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU200404001211 |
Quelle: | BISp |
Abstract des Autors
The purpose of the present study was to examine the effect of ad libitum ingestion of a carbo-hydrate-electrolyte solution (CES) with 150 mg/L 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 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 body weight). The post-exercise urinary CAF concentration (4.53 ± 0.25 µg/mL) was below the doping level of the International Olympic Committee (12 µg/mL) in all subjects (range 1.20 - 10.84 µg/mL). 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 CAF during 4 h cycling resulted in post-exercise urinary concentration below the doping level in all subjects. Verf.-Referat