Caffeine Ingestion Attenuates Fatigue-induced Loss of Muscle Torque Complexity
Pethick J, Winter SL, Burnley M
Medicine and science in sports and exercise · 44 citas
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Cómo se estudió
- Diseño
- 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
- 2017-10-05 · Med Sci Sports Exerc · vol. 50 · número 2 · págs. 236–245
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 55 citas · más que el 95% de estudios similares · 4.4× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 41 trabajos
- Acceso
- Acceso abierto (copia en repositorio)
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Muscle activation and electromyography studies
- Palabras clave
- Caffeine, Isometric exercise, Approximate entropy, Internal medicine, Sample entropy, Ingestion, Peripheral, Medicine, Muscle contraction, Contraction (grammar), Anesthesia, Cardiology, Endocrinology, Mathematics, Statistics
- MeSH
- knee, muscle, skeletal, femoral nerve, humans, caffeine, electromyography, electric stimulation, muscle fatigue, isometric contraction, torque, adult, female, male, muscle strength dynamometer, young adult
3 autores
- Jamie Pethick🇬🇧Medway School of Pharmacy; University of Kent
- Samantha Lee Winter🇬🇧Medway School of Pharmacy; University of Kent
- Mark Burnley🇬🇧Medway School of Pharmacy; University of Kent
Resumen
El texto original del estudio, en el idioma en que se publicó.
The temporal structure, or complexity, of muscle torque output decreases with neuromuscular fatigue. The role of central fatigue in this process is unclear.
Purpose
We tested the hypothesis that caffeine administration would attenuate the fatigue-induced loss of torque complexity.
Methods
Eleven healthy participants performed intermittent isometric contractions of the knee extensors to task failure at a target torque of 50% maximal voluntary contraction, with a 60% duty factor (6-s contraction, 4-s rest), 60 min after ingesting 6 mg·kg caffeine or a placebo. Torque and surface EMG signals were sampled continuously. Complexity and fractal scaling of torque were quantified using approximate entropy (ApEn) and the detrended fluctuation analysis (DFA) α scaling exponent. Global, central, and peripheral fatigue was quantified using maximal voluntary contractions with femoral nerve stimulation.
Results
Caffeine ingestion increased endurance by 30% ± 16% (mean ± SD; P = 0.019). Complexity decreased in both trials (decreased ApEn, increased DFA α; both P < 0.01), as global, central, and peripheral fatigue developed (all P < 0.01). Complexity decreased significantly more slowly after caffeine ingestion (ApEn, -0.04 ± 0.02 vs -0.06 ± 0.01 (P = 0.004); DFA α, 0.03 ± 0.02 vs 0.04 ± 0.03 (P = 0.024)), as did the rates of global (-18.2 ± 14.1 vs -23.0 ± 17.4 N·m·min, P = 0.004) and central (-3.5 ± 3.4 vs -5.7 ± 3.9 %·min, P = 0.02) but not peripheral (-6.1 ± 4.1 vs -7.9 ± 6.3 N·m·min, P = 0.06) fatigue.
Conclusions
Caffeine ingestion slowed the fatigue-induced loss of torque complexity and increased the time to task failure during intermittent isometric contractions, most likely through central mechanisms.
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