Effects of caffeine and acute exercise on the validity of a submaximal cycle ergometer test: a randomised, placebo-controlled crossover study
Björkman F, Engström J, Helge T, Ekblom Ö
European journal of applied physiology · 0 citas
Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
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- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación independiente
- Universidad u hospital
- Gymnastik- och idrottshögskolan
- Gobierno
- Försvarsmakten
- Universidad u hospital
- Swedish School of Sport and Health Sciences
Según 3 financiadores declarados y la declaración de financiación del texto completo.
Publicación
- Publicado
- 2026-02-28 · Eur J Appl Physiol · vol. 126 · número 6 · págs. 3461–3471
- Editorial
- Springer Science+Business Media
- Citado
- 0 citas · más que el 13% de estudios similares · 0.0× el promedio de su campo
- Referencias
- 48 trabajos
- Acceso
- Acceso abierto (revista híbrida) · CC-BY
- Áreas de investigación
- Cardiovascular and exercise physiology · Coffee research and impacts · Sports Performance and Training
- Palabras clave
- caffeine, acute exercise, VO2max prediction, test validity, estimation error, time to exhaustion, blood pressure, heart rate, VO2max
- MeSH
- humans, caffeine, central nervous system stimulants, exercise test, exercise, cross-over studies, double-blind method, reproducibility of results, oxygen consumption, blood pressure, heart rate, adult, female, male
4 autores
- Frida Björkman🇸🇪 · autor de correspondenciaSwedish School of Sport and Health Sciences
- Jessica Engström🇸🇪Swedish School of Sport and Health Sciences
- Torbjörn Helge🇸🇪Swedish School of Sport and Health Sciences
- Örjan B. Ekblom🇸🇪Swedish School of Sport and Health Sciences
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
To investigate the effects of caffeine (Caf) consumption and prior exercise on the validity of the Ekblom-Bak cycle test (EB-test) for estimating maximal oxygen uptake (VO₂max).
Methods
Healthy, habitual caffeine users received 250 mg Caf or placebo (Pla) in a double-blind randomised crossover design separated by one week. Each visit included two EB-tests performed before and after a maximal treadmill exercise (Ex). Heart rate (HR), blood pressure (BP), and oxygen uptake were measured, and estimation error was calculated as estimated-measured VO₂max. Data were analysed using repeated measures ANOVA with condition (Caf, Pla) and time (pre-Ex, post-Ex) as within-subject factors.
Results
Participants were 15 women and 17 men (33.5 ± 11.1 years). Resting HR and BP did not differ between trials, except for a modest increase in systolic BP after Caf (129 ± 14 mmHg vs. 122 ± 15 mmHg; p = 0.042). Maximal HR and VO₂max were unaffected, but time to exhaustion increased with caffeine (438 ± 73 s vs. 415 ± 69 s; p = 0.012). HR increased significantly from pre- to post-Ex, with no differences between Caf and Pla conditions. Estimation errors rose from pre- to post-Ex (-0.17 and - 0.12 L·min⁻¹ to - 0.28 and - 0.30 L·min⁻¹), independent of caffeine intake, body mass, or measured VO₂max.
Conclusion
Caffeine did not affect the accuracy of the VO₂max estimation from the EB-test. However, strenuous exercise before testing increased estimation errors, suggesting that recent intense exercise has a greater impact on EB-test validity than moderate caffeine consumption.
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