Placebo effects of caffeine on cycling performance
Beedie CJ, Stuart EM, Coleman DA, Foad AJ
Medicine and science in sports and exercise · 133 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
- 2006-11-28 · Med Sci Sports Exerc · vol. 38 · número 12 · págs. 2159–2164
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 209 citas · más que el 91% de estudios similares · 3.2× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 18 trabajos
- Acceso
- De pago
- Áreas de investigación
- Pain Management and Placebo Effect · Coffee research and impacts · Sports Performance and Training
- Palabras clave
- placebo effect, caffeine, cycling performance, dose-response relationship, well-trained cyclists
- MeSH
- humans, caffeine, central nervous system stimulants, double-blind method, psychomotor performance, placebo effect, bicycling, adult, male
4 autores
- Chris Beedie🇬🇧Canterbury Christ Church University
- ELIZABETH M. STUART🇬🇧Canterbury Christ Church University
- DAMIAN A. COLEMAN🇬🇧Canterbury Christ Church University
- ABIGAIL J. FOAD🇬🇧Canterbury Christ Church University
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
The placebo effect-a change attributable only to an individual's belief in the efficacy of a treatment-might provide a worthwhile improvement in physical performance. Although sports scientists account for placebo effects by blinding subjects to treatments, little research has sought to quantify and explain the effect itself. The present study explored the placebo effect in laboratory cycling performance using quantitative and qualitative methods.
Method
Six well-trained male cyclists undertook two baseline and three experimental 10-km time trials. Subjects were informed that in the experimental trials they would each receive a placebo, 4.5 mg.kg caffeine, and 9.0 mg.kg caffeine, randomly assigned. However, placebos were administered in all experimental conditions. Semistructured interviews were also conducted to explore subjects' experience of the effects of the capsules before and after revealing the deception.
Results
A likely trivial increase in mean power of 1.0% over baseline was associated with experimental trials (95% confidence limits, -1.4 to 3.6%), rising to a likely beneficial 2.2% increase in power associated with experimental trials in which subjects believed they had ingested caffeine (-0.8 to 5.4%). A dose-response relationship was evident in experimental trials, with subjects producing 1.4% less power than at baseline when they believed they had ingested a placebo (-4.6 to 1.9%), 1.3% more power than at baseline when they believed they had ingested 4.5 mg.kg caffeine (-1.4 to 4.1%), and 3.1% more power than at baseline when they believed they had ingested 9.0 mg.kg caffeine (-0.4 to 6.7%). All subjects reported caffeine-related symptoms.
Conclusions
Quantitative and qualitative data suggest that placebo effects are associated with the administration of caffeine and that these effects may directly or indirectly enhance performance in well-trained cyclists.
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