Improvements on neuromuscular performance with caffeine ingestion depend on the time-of-day
Mora-Rodríguez R, Pallarés JG, López-Gullón JM, López-Samanes Á, Fernández-Elías VE, Ortega JF
Journal of science and medicine in sport · 82 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
- 2014-04-26 · J Sci Med Sport · vol. 18 · número 3 · págs. 338–342
- Editorial
- Elsevier BV
- Citado
- 110 citas · más que el 95% de estudios similares · 4.5× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 30 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Muscle metabolism and nutrition
- Palabras clave
- caffeine ingestion, neuromuscular performance, time of day, ergogenic aids, resistance training, squatting, bench press, propulsive velocity, plasma caffeine concentration, tympanic temperature, caffeine side effects
- MeSH
- muscle, skeletal, humans, caffeine, central nervous system stimulants, exercise test, body temperature, cross-over studies, double-blind method, muscle contraction, time factors, weight lifting, male, muscle strength, young adult
6 autores
- Ricardo Mora‐Rodríguez🇪🇸University of Castilla-La Mancha
- Jesús G. Pallarés🇪🇸University of Castilla-La Mancha
- José María López Gullón🇪🇸Universidad de Murcia
- Álvaro López‐Samanes🇪🇸University of Castilla-La Mancha
- Valentín E. Fernández-Elías🇪🇸University of Castilla-La Mancha
- JUAN FERNANDO ORTEGA🇪🇸University of Castilla-La Mancha
Resumen
El texto original del estudio, en el idioma en que se publicó.
Objectives
To determine whether the ergogenic effects of caffeine ingestion on neuromuscular performance are similar when ingestion takes place in the morning and in the afternoon.
Design
Double blind, cross-over, randomized, placebo controlled design.
Methods
Thirteen resistance-trained males carried out bench press and full squat exercises against four incremental loads (25%, 50%, 75% and 90% 1RM), at maximal velocity. Trials took place 60 min after ingesting either 6 mg kg(-1) of caffeine or placebo. Two trials took place in the morning (AMPLAC and AMCAFF) and two in the afternoon (PMPLAC and PMCAFF), all separated by 36-48 h. Tympanic temperature, plasma caffeine concentration and side-effects were measured.
Results
Plasma caffeine increased similarly during AMCAFF and PMCAFF. Tympanic temperature was lower in the mornings without caffeine effects (36.7±0.4 vs. 37.0±0.5°C for AM vs. PM; p<0.05). AMCAFF increased propulsive velocity above AMPLAC to levels similar to those found in the PM trials for the 25%, 50%, 75% 1RM loads in the SQ exercise (5.4-8.1%; p<0.05). However, in the PM trials, caffeine ingestion did not improve propulsive velocity at any load during BP or SQ. The negative side effects of caffeine were more prevalent in the afternoon trials (13 vs. 26%).
Conclusions
The ingestion of a moderate dose of caffeine counteracts the muscle contraction velocity declines observed in the morning against a wide range of loads. Caffeine effects are more evident in the lower body musculature. Evening caffeine ingestion not only has little effect on neuromuscular performance, but increases the rate of negative side-effects reported.
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