Effects of caffeine ingestion on the diurnal variation of cognitive and repeated high-intensity performances
Souissi Y, Souissi M, Chtourou H
Pharmacology, biochemistry, and behavior · 32 citas
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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
- 2019-01-03 · Pharmacol Biochem Behav · vol. 177 · págs. 69–74
- Editorial
- Elsevier BV
- Citado
- 49 citas · más que el 90% de estudios similares · 2.7× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 64 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Sleep and Work-Related Fatigue · Sports Performance and Training
- Palabras clave
- caffeine ingestion, diurnal variation, time of day, reaction time, attention, cognitive performance, shuttle run, caffeine supplementation, athletic performance, caffeine dose-response, caffeine withdrawal
- MeSH
- humans, fatigue, caffeine, central nervous system stimulants, exercise test, exercise, cross-over studies, double-blind method, cognition, attention, reaction time, circadian rhythm, eating, male, young adult, performance-enhancing substances, surveys and questionnaires
3 autores
- Youssef Souissi🇹🇳 · autor de correspondenciaUniversity of Sfax; Institut Supérieur du Sport et de l’Éducation Physique de Sfax
- Makram Souissi🇹🇳University of Sfax; Faculty of Medicine of Sfax
- Hamdi Chtourou🇹🇳University of Sfax; Institut Supérieur du Sport et de l’Éducation Physique de Sfax
Resumen
El texto original del estudio, en el idioma en que se publicó.
The purpose of this study was to evaluate the effects of caffeine ingestion on the daily variation of cognitive (i.e., reaction time (RT), attention) and repeated high-intensity exercise performances. Fifteen active males (age: 20 ± 1 years, height: 174.3 ± 4.3 cm, body-mass: 70.8 ± 3.5 kg) performed cognitive and physical tasks under two different circumstances [after a placebo or caffeine ingestion (6 mg/kg of body-mass)] at six different time-of-day (07 h00, 09 h00, 11 h00, 13 h00, 15 h00 and 17 h00) in a randomized double-blind balanced crossover design. During each session, RT, attention and 5-m multiple shuttles run test' performances were recorded. During both the placebo and the caffeine conditions, a significant diurnal variation was found with improvement of cognitive performances recorded at 11 h00 (e.g., RT: 0.37 ± 0.02-s and 0.36 ± 0.02-s for placebo and caffeine respectively) and 17 h00 (e.g., RT: 0.37 ± 0.02-s and 0.35 ± 0.03-s for placebo and caffeine respectively) compared to (i.e., worst performances) 07 h00 (e.g., RT: 0.41 ± 0.02-s and 0.38 ± 0.02-s for placebo and caffeine respectively) and 13 h00 (e.g., RT: 0.41 ± 0.02-s and 0.38 ± 0.02-s for placebo and caffeine respectively) (p 0.05), 0.5% at 13 h00, 1.0% at 15 h00 and 0.5% at 17 h00) performances increased at all time-of-day (p < 0.05). In conclusion, cognitive and physical performances are time-of-day dependent and caffeine is an effective ergogenic aid to improves both cognitive and physical performances especially at the moment of their lowest values.
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