Caffeine ingestion reverses the circadian rhythm effects on neuromuscular performance in highly resistance-trained men
Mora-Rodríguez R, García Pallarés J, López-Samanes Á, Ortega JF, Fernández-Elías VE
PloS one · 64 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
- Universidad u hospital
- Universidad de Murcia
Según 1 financiador declarado y la declaración de financiación del texto completo.
Publicación
- Publicado
- 2012-04-04 · PLoS One · vol. 7 · número 4 · pág. e33807
- Editorial
- Public Library of Science
- Citado
- 89 citas · más que el 94% de estudios similares · 4.1× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 60 trabajos
- Acceso
- Acceso abierto (revista) · CC-BY
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Sleep and Work-Related Fatigue
- Palabras clave
- circadian rhythm, neuromuscular performance, resistance-trained men, muscle strength, muscle power, norepinephrine, muscle sympathetic nerve activity, bench press, testosterone, cortisol, growth hormone, plasma catecholamines
- MeSH
- humans, caffeine, testosterone, central nervous system stimulants, exercise, case-control studies, cross-over studies, double-blind method, circadian rhythm, eating, physical endurance, adult, male, muscle strength, resistance training, young adult
5 autores
- Ricardo Mora‐Rodríguez🇪🇸 · autor de correspondenciaUniversity of Castilla-La Mancha
- Jesús G. Pallarés
- Álvaro López‐Samanes🇧🇷🇪🇸Universidade de São Paulo; University of Castilla-La Mancha
- JUAN FERNANDO ORTEGA🇧🇷🇪🇸Universidade de São Paulo; University of Castilla-La Mancha
- Valentín E. Fernández-Elías
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
To investigate whether caffeine ingestion counteracts the morning reduction in neuromuscular performance associated with the circadian rhythm pattern.
Methods
Twelve highly resistance-trained men underwent a battery of neuromuscular tests under three different conditions; i) morning (10:00 a.m.) with caffeine ingestion (i.e., 3 mg kg(-1); AM(CAFF) trial); ii) morning (10:00 a.m.) with placebo ingestion (AM(PLAC) trial); and iii) afternoon (18:00 p.m.) with placebo ingestion (PM(PLAC) trial). A randomized, double-blind, crossover, placebo controlled experimental design was used, with all subjects serving as their own controls. The neuromuscular test battery consisted in the measurement of bar displacement velocity during free-weight full-squat (SQ) and bench press (BP) exercises against loads that elicit maximum strength (75% 1RM load) and muscle power adaptations (1 m s(-1) load). Isometric maximum voluntary contraction (MVC(LEG)) and isometric electrically evoked strength of the right knee (EVOK(LEG)) were measured to identify caffeine's action mechanisms. Steroid hormone levels (serum testosterone, cortisol and growth hormone) were evaluated at the beginning of each trial (PRE). In addition, plasma norepinephrine (NE) and epinephrine were measured PRE and at the end of each trial following a standardized intense (85% 1RM) 6 repetitions bout of SQ (POST).
Results
In the PM(PLAC) trial, dynamic muscle strength and power output were significantly enhanced compared with AM(PLAC) treatment (3.0%-7.5%; p≤0.05). During AM(CAFF) trial, muscle strength and power output increased above AM(PLAC) levels (4.6%-5.7%; p≤0.05) except for BP velocity with 1 m s(-1) load (p = 0.06). During AM(CAFF), EVOK(LEG) and NE (a surrogate of maximal muscle sympathetic nerve activation) were increased above AM(PLAC) trial (14.6% and 96.8% respectively; p≤0.05).
Conclusions
These results indicate that caffeine ingestion reverses the morning neuromuscular declines in highly resistance-trained men, raising performance to the levels of the afternoon trial. Our electrical stimulation data, along with the NE values, suggest that caffeine increases neuromuscular performance having a direct effect in the muscle.
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