Caffeine Supplementation Increases Muscle Strength, but Not Endurance, While Both Caffeine and Its Expectation Elevate Blood Lactate: A Balanced-Placebo Design Study
Soares EMKVK, da Cruz CJG, Ives SJ, Molina GE, Fontana KE
Nutrients · 1 cita
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
- Gobierno
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Gobierno
- Coordenação de Aperfeicoamento de Pessoal de Nível Superior
Según 2 financiadores declarados y la declaración de financiación del texto completo.
Publicación
- Publicado
- 2026-02-28 · Nutrients · vol. 18 · número 5 · pág. 801
- Editorial
- Multidisciplinary Digital Publishing Institute
- Citado
- 2 citas · más que el 96% de estudios similares · 7.8× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 0 trabajos
- Acceso
- Acceso abierto (revista) · CC-BY
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Muscle metabolism and nutrition
- Palabras clave
- caffeine supplementation, muscle strength, muscular endurance, blood lactate, placebo effect, resistance-trained men, knee extensors, peak torque, interindividual variability
- MeSH
- muscle, skeletal, humans, lactic acid, caffeine, double-blind method, physical endurance, dietary supplements, adolescent, adult, male, muscle strength, resistance training, young adult
5 autores
- Edgard Melo Keene Von Koenig Soares🇧🇷🇺🇸 · autor de correspondenciaUniversidade de Brasília; Skidmore College
- Carlos Janssen Gomes da Cruz🇧🇷Universidade de Brasília; Centro Universitário Euroamericano
- Stephen J. Ives🇺🇸 · autor de correspondenciaSkidmore College
- Guilherme Eckhardt Molina🇧🇷Universidade de Brasília
- Keila Elizabeth Fontana🇧🇷Universidade de Brasília
Resumen
El texto original del estudio, en el idioma en que se publicó.
Objectives: To determine whether caffeine supplementation and its expectancy influence muscle strength (ST) and muscle endurance (ME) using a balanced-placebo design. Methods: Using a randomized, double-blind, balanced-placebo design, resistance-trained men (18-30 years; n = 16) participated in two assessment/familiarization visits (demographics; one repetition maximum (1RM) followed by four counterbalanced sessions: C/C (informed caffeine/used caffeine), P/C (informed placebo/used caffeine), C/P (informed caffeine/used placebo), P/P (informed placebo/used placebo). Caffeine dose was 5 mg/kg. Peak torque (PT) and maximum work (MW) were measured in the knee extensors at 0, 60, 180, and 300°/s, which was followed by ME testing (three sets of maximal repetitions using 60%1RM). Capillary blood lactate was measured after ME testing. Results: Caffeine increased PT only during static and 60°/s contractions (4%; p ≤ 0.003; d = 0.3 for both speeds), while MW increased across all speeds (4%; p p = 0.184; d = 0.1), but it did increase blood lactate levels (1.2 mmol/L; p p = 0.003; d = 0.4). Across ST and ME, responses to caffeine were markedly heterogeneous, with 50-88% of individuals considered responders (∆ > 0), and improvements in responders ranged from 1-16%. Conclusions: Caffeine significantly increased ST, despite ME increasing in 50% of participants, this was not significant. No placebo effect was observed in ST or ME, but it significantly increased lactate. Further research is necessary to elucidate the mechanisms behind this variability in the ME response, especially the role of fiber-type predominance.
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