Time of Day and Training Status Both Impact the Efficacy of Caffeine for Short Duration Cycling Performance
Boyett JC, Giersch GE, Womack CJ, Saunders MJ, Hughey CA, Daley HM, Luden ND
Nutrients · 38 citas
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 independiente
Según la declaración de financiación del texto completo.
Publicación
- Publicado
- 2016-10-14 · Nutrients · vol. 8 · número 10 · pág. 639
- Editorial
- Multidisciplinary Digital Publishing Institute
- Citado
- 53 citas · más que el 90% de estudios similares · 3.0× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 46 trabajos
- Acceso
- Acceso abierto (revista) · CC-BY
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Muscle metabolism and nutrition
- Palabras clave
- caffeine supplementation, time of day, training status, cycling performance, time trial, ergogenic aids, trained vs untrained athletes
- MeSH
- humans, caffeine, treatment outcome, double-blind method, circadian rhythm, physical education and training, bicycling, dietary supplements, adolescent, adult, male, athletic performance, young adult, physical conditioning, human
7 autores
- James C. Boyett🇺🇸James Madison University
- Gabrielle E. W. Giersch🇺🇸James Madison University
- Christopher J. Womack🇺🇸James Madison University
- Michael J. Saunders🇺🇸James Madison University
- Christine A. Hughey🇺🇸James Madison University
- Hannah Daley🇺🇸James Madison University
- Nicholas D. Luden🇺🇸 · autor de correspondenciaJames Madison University
Resumen
El texto original del estudio, en el idioma en que se publicó.
This project was designed to assess the effects of time of day and training status on the benefits of caffeine supplementation for cycling performance. Twenty male subjects (Age, 25 years; Peak oxygen consumption, 57 mL·kg-1·min-1) were divided into tertiles based on training levels, with top and bottom tertiles designated as 'trained' (n = 7) and 'untrained' (n = 7). Subjects completed two familiarization trials and four experimental trials consisting of a computer-simulated 3-km cycling time trial (TT). The trials were performed in randomized order for each combination of time of day (morning and evening) and treatment (6mg/kg of caffeine or placebo). Magnitude-based inferences were used to evaluate all treatment effects. For all subjects, caffeine enhanced TT performance in the morning (2.3% ± 1.7%, 'very likely') and evening (1.4% ± 1.1%, 'likely'). Both untrained and trained subjects improved performance with caffeine supplementation in the morning (5.5% ± 4.3%, 'likely'; 1.0% ± 1.7%, 'likely', respectively), but only untrained subjects rode faster in the evening (2.9% ± 2.6%, 'likely'). Altogether, our observations indicate that trained athletes are more likely to derive ergogenic effects from caffeine in the morning than the evening. Further, untrained individuals appear to receive larger gains from caffeine in the evening than their trained counterparts.
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