Effect of ambient temperature on caffeine ergogenicity during endurance exercise
Ganio MS, Johnson EC, Klau JF, Anderson JM, Casa DJ, Maresh CM, Volek JS, Armstrong LE
European journal of applied physiology · 33 citas
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Financiación no declaradaDatos neutrales que nuestra revisión registró sobre cómo se hizo este estudio. Describen el método, nunca si nos gusta el resultado.
Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2010-11-30 · Eur J Appl Physiol · vol. 111 · número 6 · págs. 1135–1146
- Editorial
- Springer Science+Business Media
- Citado
- 44 citas · más que el 82% de estudios similares · 1.5× el promedio de su campo
- Referencias
- 60 trabajos
- Acceso
- De pago
- Áreas de investigación
- Thermoregulation and physiological responses · Coffee research and impacts · Sports Performance and Training
- Palabras clave
- caffeine, ergogenic aids, endurance exercise, ambient temperature, heat stress, endurance cycling, rectal temperature, sweat loss, endurance performance
- MeSH
- humans, caffeine, central nervous system stimulants, exercise test, exercise, double-blind method, environment, temperature, sweating, physical endurance, adolescent, adult, male, athletic performance, young adult
8 autores
- Matthew S. Ganio🇺🇸 · autor de correspondenciaUniversity of Connecticut
- Evan C. Johnson🇺🇸University of Connecticut
- Jennifer F. Klau🇺🇸University of Connecticut
- Jeffrey M. Anderson🇺🇸University of Connecticut
- Douglas J. Casa🇺🇸University of Connecticut
- Carl M. Maresh🇺🇸University of Connecticut
- Jeff S. Volek🇺🇸University of Connecticut
- Lawrence E. Armstrong🇺🇸University of Connecticut
Resumen
El texto original del estudio, en el idioma en que se publicó.
It is well established that caffeine ingestion during exercise enhances endurance performance. Conversely, the physiological and psychological strain that accompanies increased ambient temperature decreases endurance performance. Little is known about the interaction between environmental temperature and the effects of caffeine on performance. The purpose of this study was to compare the effects of ambient temperature (12 and 33°C) on caffeine ergogenicity during endurance cycling exercise. Eleven male cyclists (mean ± SD; age, 25 ± 6 years; [Formula: see text] 58.7 ± 2.9 ml kg(-1) min(-1)) completed four exercise trials in a randomized, double blind experimental design. After cycling continuously for 90 min (average 65 ± 7% [Formula: see text]) in either a warm (33 ± 1°C, 41 ± 5%rh) or cool (12 ± 1°C, 60 ± 7%rh) environment, subjects completed a 15-min performance trial (PT; based on total work accumulated). Subjects ingested 3 mg kg(-1) of encapsulated caffeine (CAF) or placebo (PLA) 60 min prior to and after 45 min of exercise. Throughout exercise, subjects ingested water so that at the end of exercise, independent of ambient temperature, their body mass was reduced 0.55 ± 0.67%. Two-way (temperature × treatment) repeated-measures ANOVA were conducted with alpha set at 0.05. Total work (kJ) during the PT was greater in 12°C than 33°C [P 0.05). Increased ambient temperature had a detrimental effect on cycling performance in both the CAF and PLA conditions. CAF improved performance independent of environmental temperature. These findings suggest that caffeine at the dosage utilized (6 mg/kg body mass) is a, legal drug that provides an ergogenic benefit in 12 and 33°C.
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