Thermoregulatory responses to exercise in the heat: chronic caffeine intake has no effect
Roti MW, Casa DJ, Pumerantz AC, Watson G, Judelson DA, Dias JC, Ruffin K, Armstrong LE
Aviation, space, and environmental medicine · 26 citas
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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
- 2006-02-01 · Aviat Space Environ Med · vol. 77 · número 2 · págs. 124–9
- Editorial
- National Institutes of Health
- Citado
- 47 citas · más que el 87% de estudios similares · 2.4× el promedio de su campo
- Referencias
- 0 trabajos
- Acceso
- De pago
- Áreas de investigación
- Thermoregulation and physiological responses · Coffee research and impacts · Exercise and Physiological Responses
- Palabras clave
- caffeine, thermoregulation, exercise in the heat, fluid and electrolyte balance, exercise endurance, acute caffeine ingestion, military personnel, sleep deprivation, cardiovascular response
- MeSH
- humans, heat stress disorders, caffeine, exercise, analysis of variance, double-blind method, water-electrolyte balance, body temperature regulation, physical endurance, adult, military personnel, male, hot temperature
8 autores
- Melissa W. Roti🇺🇸University of Connecticut
- Douglas J. Casa
- Amy C. Pumerantz
- Greig Watson
- Daniel A. Judelson
- Joao C Dias
- Katherine T. Ruffin
- Lawrence E. Armstrong
Resumen
El texto original del estudio, en el idioma en que se publicó.
Introduction
Authorities advise individuals to refrain from caffeine intake before or during exercise, especially when performed in the heat, due to potential fluid-electrolyte imbalances that exaggerate physiological strain. Yet, military personnel are often deployed to hot environments and must perform under sleep-deprived conditions where caffeine would be an ideal intervention strategy to enhance physical and cognitive performance.
Purpose
To assess the effects of controlled chronic and acute caffeine ingestion on fluid-electrolyte, physiological and thermoregulatory responses during an exercise heat tolerance test (EHT).
Methods
Subjects were 59 active, college-aged males (mean +/- SE 21.6 +/- 0.4 yr, 177.9 +/- 0.8 cm, 75.4 +/- 1.0 kg, 11.1 +/- 0.7% body fat) who were randomized and stratified by age, bodyweight, and body composition into three groups. All subjects equilibrated caffeine intake at 3 mg x kg(-1) x d(-1) for days 1-6. On days 7-12, they consumed a treatment dose of either 0 (G0), 3 (G3), or 6 (G6) mg x kg(-1) x d(-1). Fluid-electrolyte and physiological measures were made on day 12, 1 h after caffeine intake, during the EHT (90 min walking, 1.56 m x s(-1), 5% grade; dry bulb temperature, 37.7 +/- 0.1 degree C; relative humidity, 56.3 -1.5%).
Results
There were no between-group differences (p > 0.05) in plasma, urinary, thermoregulatory, cardiovascular, and perceptual variables across time (pre- vs. post-EHT), although some of these variables increased significantly over time (p < 0.05). EHT time was significantly greater in G3 (86 +/- 2.0 min) vs. GO (75 +/- 3.3 min, p < 0.05).
Discussion
Acute caffeine ingestion, in chronically consuming subjects (3 and 6 mg x kg(-1) x d(-1)) did not alter fluid-electrolyte, exercise endurance or thermoregulatory responses during EHT when compared with G0.
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