Caffeine-induced increase in voluntary activation and strength of the quadriceps muscle during isometric, concentric and eccentric contractions
Behrens M, Mau-Moeller A, Weippert M, Fuhrmann J, Wegner K, Skripitz R, Bader R, Bruhn S
Scientific reports · 73 citas
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- Ensayo controlado aleatorizado (clasificado por nuestro filtro de IA)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2015-05-13 · Sci Rep · vol. 5 · número 1 · pág. 10209
- Editorial
- Nature Portfolio
- Citado
- 98 citas · más que el 99% de estudios similares · 20.5× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 40 trabajos
- Acceso
- Acceso abierto (revista) · CC-BY
- Áreas de investigación
- Cardiovascular and exercise physiology · Exercise and Physiological Responses · Sports Performance and Training
- Palabras clave
- Isometric exercise, Concentric, Eccentric, Caffeine, Muscle contraction, Turnover, Medicine, Internal medicine, Placebo, Reflex, Crossover study, Ingestion, Endocrinology, Anesthesia, Physical medicine and rehabilitation, Physical therapy, Mathematics, Physics
- MeSH
- humans, caffeine, electromyography, evoked potentials, muscle contraction, adult, female, male, quadriceps muscle, muscle strength, young adult
8 autores
- Martin Behrens🇩🇪University of Rostock
- Anett Mau‐Moeller
- Matthias Weippert🇩🇪University of Rostock
- Josefin Fuhrmann🇩🇪University of Rostock
- Katharina Wegner
- Ralf Skripitz
- Rainer Bader
- Sven Bruhn🇩🇪University of Rostock
Resumen
El texto original del estudio, en el idioma en que se publicó.
This study investigated effects of caffeine ingestion (8 mg/kg) on maximum voluntary torque (MVT) and voluntary activation of the quadriceps during isometric, concentric and eccentric contractions. Fourteen subjects ingested caffeine and placebo in a randomized, controlled, counterbalanced, double-blind crossover design. Neuromuscular tests were performed before and 1 h after oral caffeine and placebo intake. MVTs were measured and the interpolated twitch technique was applied during isometric, concentric and eccentric contractions to assess voluntary activation. Furthermore, normalized root mean square of the EMG signal was calculated and evoked spinal reflex responses (H-reflex evoked at rest and during weak isometric voluntary contraction) as well as twitch torques were analyzed. Caffeine increased MVT by 26.4 N m (95%CI: 9.3-43.5 N m, P = 0.004), 22.5 N m (95%CI: 3.1-42.0 N m, P = 0.025) and 22.5 N m (95%CI: 2.2-42.7 N m, P = 0.032) for isometric, concentric and eccentric contractions. Strength enhancements were associated with increases in voluntary activation. Explosive voluntary strength and voluntary activation at the onset of contraction were significantly increased following caffeine ingestion. Changes in spinal reflex responses and at the muscle level were not observed. Data suggest that caffeine ingestion induced an acute increase in voluntary activation that was responsible for the increased strength regardless of the contraction mode.
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