| Caffeine and sport: role of physical exercise upon elimination. | |
| | |
MedLine Citation:
|
PMID: 1956275 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Urinary excretion of caffeine in two populations (men and women) of cyclotourists was measured, at rest and during exercise, after oral administration of 350 mg of caffeine in aqueous solution. The so-called "total metabolites", as measured by the EMIT test, were also determined, as well as urinary creatinine. At rest, elimination in relation to body weight was identical in men and women. During exercise a fivefold decrease in the female and twofold decrease in the male populations were observed. After exercise, caffeine elimination was greater than during the physical trial but remained lower for women than for men. "Total metabolites" excretion showed evidence for a slowing of caffeine catabolism during exercise and a restart of it after exercise. The caffeine content of beverages varies considerably from one country to another, depending on local customs, so that caffeine intake may be highly variable. Our results lead us to query the validity of the upper authorized official limit for urinary caffeine (12 micrograms.ml-1) in doping controls. The nature of the sporting event, sex, weight, and sampling delay after exercise are all factors that argue against the utilization of a unique standard. |
| | |
Authors:
|
J M Duthel; J J Vallon; G Martin; J M Ferret; R Mathieu; R Videman |
Related Documents
:
|
2733575 - Gastric emptying: influence of prolonged exercise and carbohydrate concentration. 14757995 - Use of the glycemic index: effects on feeding patterns and exercise performance. 12081825 - Carbohydrate administration during a day of sustained aerobic activity improves vigilan... 18834505 - International society of sports nutrition position stand: nutrient timing. 6366835 - Physiological effects of exercise in the diabetic. 11374115 - Association between different attributes of physical activity and fat mass in untrained... |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Medicine and science in sports and exercise Volume: 23 ISSN: 0195-9131 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 1991 Aug |
Date Detail:
|
Created Date: 1991-12-30 Completed Date: 1991-12-30 Revised Date: 2004-11-17 |
Medline Journal Info:
|
Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: UNITED STATES |
Other Details:
|
Languages: eng Pagination: 980-5 Citation Subset: IM; S |
Affiliation:
|
Laboratoire de Biochimie, Toxicologie et Analyse des Traces, Hôpital Edouard Herriot, France. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Adult Bicycling Body Weight Caffeine / urine* Chromatography, Gas Creatinine / urine Exercise / physiology* Female Humans Male Middle Aged Sex Factors Sports* |
| Chemical | |
Reg. No./Substance:
|
58-08-2/Caffeine; 60-27-5/Creatinine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: A physical activity questionnaire for the elderly.
Next Document: Comparison of patients with idiopathic calcium phosphate and calcium oxalate stones.