Caffeine intake improves intense intermittent exercise performance and reduces muscle interstitial potassium accumulation
Mohr M, Nielsen JJ, Bangsbo J
Journal of applied physiology (Bethesda, Md. : 1985) · 104 citas
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Publicación
- Publicado
- 2011-08-12 · J Appl Physiol (1985) · vol. 111 · número 5 · págs. 1372–1379
- Editorial
- American Physiological Society
- Citado
- 161 citas · más que el 96% de estudios similares · 5.2× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 51 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Muscle metabolism and nutrition
- Palabras clave
- caffeine, intermittent exercise, Yo-Yo test, fatigue resistance, exercise performance, free fatty acids, blood ammonia, blood glucose, knee extension exercise, microdialysis
- MeSH
- leg, muscle, skeletal, knee joint, humans, potassium, sodium, ammonia, caffeine, blood glucose, fatty acids, nonesterified, exercise test, exercise, microdialysis, double-blind method, muscle fatigue, adult, female, male, young adult
3 autores
- Magni Mohr🇩🇰🇬🇧University of Copenhagen; University of Exeter; Copenhagen Muscle Research Centre
- J. Nielsen🇩🇰University of Copenhagen; Copenhagen Muscle Research Centre
- Jens Bangsbo🇩🇰 · autor de correspondenciaUniversity of Copenhagen; Copenhagen Muscle Research Centre
Resumen
El texto original del estudio, en el idioma en que se publicó.
The effect of oral caffeine ingestion on intense intermittent exercise performance and muscle interstitial ion concentrations was examined. The study consists of two studies (S1 and S2). In S1, 12 subjects completed the Yo-Yo intermittent recovery level 2 (Yo-Yo IR2) test with prior caffeine (6 mg/kg body wt; CAF) or placebo (PLA) intake. In S2, 6 subjects performed one low-intensity (20 W) and three intense (50 W) 3-min (separated by 5 min) one-legged knee-extension exercise bouts with (CAF) and without (CON) prior caffeine supplementation for determination of muscle interstitial K(+) and Na(+) with microdialysis. In S1 Yo-Yo IR2 performance was 16% better (P < 0.05) in CAF compared with PLA. In CAF, plasma K(+) at the end of the Yo-Yo IR2 test was 5.2 ± 0.1 mmol/l with no difference between the trials. Plasma free fatty acids (FFA) were higher (P < 0.05) in CAF than PLA at rest and remained higher (P < 0.05) during exercise. Peak blood glucose (8.0 ± 0.6 vs. 6.2 ± 0.4 mmol/l) and plasma NH(3) (137.2 ± 10.8 vs. 113.4 ± 13.3 μmol/l) were also higher (P < 0.05) in CAF compared with PLA. In S2 interstitial K(+) was 5.5 ± 0.3, 5.7 ± 0.3, 5.8 ± 0.5, and 5.5 ± 0.3 mmol/l at the end of the 20-W and three 50-W periods, respectively, in CAF, which were lower (P < 0.001) than in CON (7.0 ± 0.6, 7.5 ± 0.7, 7.5 ± 0.4, and 7.0 ± 0.6 mmol/l, respectively). No differences in interstitial Na(+) were observed between CAF and CON. In conclusion, caffeine intake enhances fatigue resistance and reduces muscle interstitial K(+) during intense intermittent exercise.
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