Influence of caffeine on metabolic and cardiovascular functions during sustained light intensity cycling and at rest
Engels HJ, Wirth JC, Celik S, Dorsey JL
International journal of sport nutrition · 26 citas
Etiquetas de revisión
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
- 1999-12-01 · Int J Sport Nutr · vol. 9 · número 4 · págs. 361–370
- Editorial
- Human Kinetics
- Citado
- 46 citas · más que el 59% de estudios similares · 0.2× el promedio de su campo
- Referencias
- 0 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Cardiovascular and exercise physiology · Thermoregulation and physiological responses
- Palabras clave
- caffeine, exercise metabolism, oxygen consumption, energy expenditure, respiratory exchange ratio, thermogenesis, substrate oxidation, cardiovascular function, arterial blood pressure, heart rate, stroke volume, systemic vascular resistance, cardiac output, hemodynamics
- MeSH
- humans, caffeine, central nervous system stimulants, pulmonary gas exchange, spirometry, exercise, analysis of variance, double-blind method, energy metabolism, oxygen consumption, bicycling, rest, adult, female, male, hemodynamics
4 autores
- Hermann-J. Engels🇺🇸Wayne State University
- John C. Wirth🇺🇸Wayne State University
- Sueda Celik🇺🇸Florida State University
- Jodee L. Dorsey🇺🇸Florida State University
Resumen
El texto original del estudio, en el idioma en que se publicó.
This study assessed the influence of caffeine on metabolic and cardiovascular functions during sustained, light intensity cycling and at rest. Eight healthy, recreationally active adults participated in four randomly assigned, double-blind experimental trials of 60 min upright seated cycle exercise (30% VO2 max) or equivalent rest with caffeine (5 mg.kg-1) or placebo consumed 60 min prior to data collection. Gas exchange was measured by open-circuit spirometry indirect calorimetry. Global blood flow was evaluated by thoracic impedance cardiography and arterial blood pressure by auscultation. A repeated measures ANOVA indicated that pretrial caffeine increased oxygen uptake and energy expenditure rate (p < 0.05) but did not change respiratory exchange ratio. Systolic, diastolic, and mean arterial blood pressure were elevated following caffeine intake (p < 0.05). Cardiac output, heart rate, stroke volume, and systemic vascular resistance were not significantly different between caffeine and placebo sessions. For each of the metabolic and hemodynamic variables examined, the effects of caffeine were similar during constant-load, light intensity cycling and at rest. These data illustrate that caffeine's mild thermogenic influence can be mediated without a major shift in substrate oxidation mixture. Caffeine at this dosage level alters cardiovascular dynamics by augmenting arterial blood pressure.
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