Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis
Grgic J, Trexler ET, Lazinica B, Pedisic Z
Journal of the International Society of Sports Nutrition · 250 citas
Cómo se estudió
- Diseño
- Metaanálisis (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación independiente
Según la declaración de financiación del texto completo.
Publicación
- Publicado
- 2018-01-05 · J Int Soc Sports Nutr · vol. 15 · número 1 · pág. 11
- Editorial
- Springer Science+Business Media
- Citado
- 367 citas · más que el 99% de estudios similares · 6.4× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 45 trabajos
- Acceso
- Acceso abierto (revista) · OTHER-OA
- Áreas de investigación
- Coffee research and impacts · Smoking Behavior and Cessation · Tea Polyphenols and Effects
- Palabras clave
- Caffeine, Medicine, Meta-analysis, Placebo, Confidence interval, Blinding, Ingestion, Sarcopenia, Internal medicine, Physical therapy, Randomized controlled trial, Pathology
- MeSH
- muscle, skeletal, humans, caffeine, muscle strength, athletes, performance-enhancing substances, sports nutritional physiological phenomena
4 autores
- Jozo Grgić🇦🇺Victoria University
- Eric T. Trexler🇺🇸University of North Carolina at Chapel Hill
- Bruno Lazinica🇭🇷University of Osijek
- Željko Pedišić🇦🇺 · autor de correspondenciaVictoria University
Resumen
El texto original del estudio, en el idioma en que se publicó.
Background
Caffeine is commonly used as an ergogenic aid. Literature about the effects of caffeine ingestion on muscle strength and power is equivocal. The aim of this systematic review and meta-analysis was to summarize results from individual studies on the effects of caffeine intake on muscle strength and power.
Methods
A search through eight databases was performed to find studies on the effects of caffeine on: (i) maximal muscle strength measured using 1 repetition maximum tests; and (ii) muscle power assessed by tests of vertical jump. Meta-analyses of standardized mean differences (SMD) between placebo and caffeine trials from individual studies were conducted using the random effects model.
Results
Ten studies on the strength outcome and ten studies on the power outcome met the inclusion criteria for the meta-analyses. Caffeine ingestion improved both strength (SMD = 0.20; 95% confidence interval [CI]: 0.03, 0.36; p = 0.023) and power (SMD = 0.17; 95% CI: 0.00, 0.34; p = 0.047). A subgroup analysis indicated that caffeine significantly improves upper (SMD = 0.21; 95% CI: 0.02, 0.39; p = 0.026) but not lower body strength (SMD = 0.15; 95% CI: -0.05, 0.34; p = 0.147).
Conclusion
The meta-analyses showed significant ergogenic effects of caffeine ingestion on maximal muscle strength of upper body and muscle power. Future studies should more rigorously control the effectiveness of blinding. Due to the paucity of evidence, additional findings are needed in the female population and using different forms of caffeine, such as gum and gel.
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