Combined caffeine and carbohydrate ingestion: effects on nocturnal sleep and exercise performance in athletes
Miller B, O'Connor H, Orr R, Ruell P, Cheng HL, Chow CM
European journal of applied physiology · 28 citas
Etiquetas de revisión
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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
- 2014-08-12 · Eur J Appl Physiol · vol. 114 · número 12 · págs. 2529–2537
- Editorial
- Springer Science+Business Media
- Citado
- 43 citas · más que el 77% de estudios similares · 1.3× el promedio de su campo
- Referencias
- 46 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Sleep and Work-Related Fatigue · Sleep and related disorders
- Palabras clave
- caffeine, carbohydrate-electrolyte beverage, sleep disruption, nocturnal sleep, exercise performance, cycling time trial, athletes, sleep latency, sleep efficiency, REM sleep, perceived exertion, heart rate, triathletes, performance-enhancing drugs, doping risk, caffeine tolerance
- MeSH
- humans, caffeine, dietary carbohydrates, polysomnography, double-blind method, sleep, oxygen consumption, heart rate, physical endurance, bicycling, adult, male, athletic performance, young adult, athletes, performance-enhancing substances
6 autores
- Ben Miller🇦🇺The University of Sydney
- Helen T O'Connor🇦🇺The University of Sydney
- Rhonda Orr🇦🇺The University of Sydney
- Patricia A. Ruell🇦🇺The University of Sydney
- Hoi Lun Cheng🇦🇺The University of Sydney
- Chin Moi Chow🇦🇺 · autor de correspondenciaThe University of Sydney
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
In athletes, caffeine use is common although its effects on sleep have not been widely studied. This randomised, double-blind, placebo-controlled crossover trial investigated the effects of late-afternoon caffeine and carbohydrate-electrolyte (CEB) co-ingestion on cycling performance and nocturnal sleep.
Methods
Six male cyclists/triathletes (age 27.5 ± 6.9 years) completed an afternoon training session (TS; cycling 80 min; 65% VO₂max) followed by a 5 kJ kg(-1) cycling time trial (TT). Caffeine (split dose 2 × 3 mg kg(-1)) or placebo was administered 1 h prior and 40 min into the TS. A 7.4% CEB (3 ml kg(-1) every 15 min) was administered during the TS, followed 30 min after by a standardised evening meal. Participants retired at their usual bedtime and indices of sleep duration and quality were monitored via polysomnography.
Data
mean ± SD.
Results
All participants performed better in the caffeine TT (caffeine 19.7 ± 3.3; placebo 20.5 ± 3.5 min; p = 0.006), while ratings of perceived exertion (caffeine 12.0 ± 0.6; placebo 12.9 ± 0.7; p = 0.004) and heart rate (caffeine 175 ± 6; placebo 167 ± 11 bpm; p = 0.085) were lower in the caffeine TS. Caffeine intake induced significant disruptions to a number of sleep indices including increased sleep onset latency (caffeine 51.1 ± 34.7; placebo 10.2 ± 4.2 min; p = 0.028) and decreased sleep efficiency (caffeine 76.1 ± 19.6; placebo 91.5 ± 4.2%; p = 0.028), rapid eye movement sleep (caffeine 62.1 ± 19.6; placebo 85.8 ± 24.7 min; p = 0.028) and total sleep time (caffeine 391 ± 97; placebo 464 ± 49 min; p = 0.028).
Conclusions
This study supports a performance-enhancing effect of caffeine, although athletes (especially those using caffeine for late-afternoon/evening training and competition) should consider its deleterious effects on sleep.
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