Effect of caffeine on LT, VT and HRVT
Karapetian GK, Engels HJ, Gretebeck KA, Gretebeck RJ
International journal of sports medicine · 28 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
- 2012-04-12 · Int J Sports Med · vol. 33 · número 07 · págs. 507–513
- Editorial
- Thieme Medical Publishers (Germany)
- Citado
- 56 citas · más que el 89% de estudios similares · 2.9× el promedio de su campo
- Referencias
- 0 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Cardiovascular and exercise physiology · Sports Performance and Training
- Palabras clave
- caffeine, ventilatory threshold, lactate threshold, autonomic regulation, exercise tolerance, cycle ergometry, pulmonary gas exchange, minute ventilation, central nervous system stimulation
- MeSH
- humans, carbon dioxide, lactic acid, caffeine, central nervous system stimulants, exercise test, pulmonary gas exchange, exercise, cross-over studies, double-blind method, oxygen consumption, anaerobic threshold, heart rate, adolescent, adult, female, male, young adult
4 autores
- Gregory K. Karapetian🇺🇸Henry Ford College
- Hermann J. Engels🇺🇸Wayne State University
- Kim A. Gretebeck🇺🇸University of Michigan
- Randal J. Gretebeck🇺🇸 · autor de correspondenciaWayne State University
Resumen
El texto original del estudio, en el idioma en que se publicó.
Unlabelled
Caffeine has many diverse physiological effects including central nervous system stimulation. Ventilatory threshold and a recently described heart rate variability threshold both have a relationship with autonomic control that could be altered by caffeine consumption. The purpose of this investigation was to determine the influence of caffeine on lactate, ventilatory, and heart rate variability thresholds during progressive exercise. Using a randomized placebo controlled, double-blind study design, 10 adults performed 2 graded maximal cycle ergometry tests with and without caffeine (5 mg·kg⁻¹). Respiratory gas exchange, blood lactate concentrations, and heart rate variability data were obtained at baseline and throughout exercise.
Results
At rest, caffeine (p<0.05) increased blood lactate, oxygen consumption, carbon dioxide production, and minute ventilation. For indices of heart rate variability at rest, caffeine increased (p<0.05) the coefficient of variation, while standard deviation, and mean successive difference displayed non-significant increases. During progressive exercise, minute ventilation volumes were higher in caffeine trials but no other parameters were significantly different compared to placebo tests.
Conclusion
These data demonstrate the robustness of the lactate, ventilatory and heart rate variability thresholds when challenged by a physiological dose of caffeine.
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