Effects of ephedrine, caffeine, and their combination on muscular endurance
Jacobs I, Pasternak H, Bell DG
Medicine and science in sports and exercise · 54 citas
Etiquetas de revisión
Financiación no declaradaDatos neutrales que nuestra revisión registró sobre cómo se hizo este estudio. Describen el método, nunca si nos gusta el resultado.
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 no declarada
Publicación
- Publicado
- 2003-06-01 · Med Sci Sports Exerc · vol. 35 · número 6 · págs. 987–994
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 91 citas · más que el 88% de estudios similares · 2.6× el promedio de su campo
- Referencias
- 29 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Muscle metabolism and nutrition
- Palabras clave
- ephedrine, caffeine, muscular endurance, resistance training, supersets, leg press, bench press, systolic blood pressure, acute supplementation, performance improvement
- MeSH
- muscle, skeletal, humans, ephedrine, caffeine, central nervous system stimulants, double-blind method, physical endurance, drug interactions, weight lifting, adolescent, adult, male
3 autores
- Ira Allen Jacobs🇨🇦Defence Research and Development Canada; University of Toronto
- Harley Pasternak🇨🇦University of Toronto
- Doug G Bell🇨🇦Defence Research and Development Canada
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
The purpose of this study was to investigate the effects of ingesting caffeine (C), ephedrine (E), and their combination on muscular endurance, using a double-blind, repeated measures design.
Methods
Ninety minutes after ingesting either C (4 mg x kg-1), E (0.8 mg x kg-1), a combination of C+E, or a placebo (P), 13 male subjects performed a weight-training circuit consisting of three supersets (SS), each SS consisting of leg press (at 80% of 1 RM to exhaustion) followed by bench press (at 70% 1-RM to exhaustion); 2 min of rest intervened between SS.
Results
The trials involving ephedrine ingestion (C+E and E), when compared with the nonephedrine trials (C and P), caused significant increases (P < 0.05) in the mean number of repetitions completed for both the leg-press and bench-press exercises but only during the first SS. During that first set, the mean number (+/-SD) of repetitions for leg press was 19 +/- 8, 16 +/- 7, 14 +/- 6, and 13 +/- 5 for the C+E, E, C, and P trials, respectively. The mean numbers of repetitions for the first set of bench-press exercise were 14 +/- 3, 13 +/- 3, 12 +/- 3, and 12 +/- 3 for the C+E, E, C, and P trials, respectively. As a result, the total weight lifted during all three sets was greater for the trials involving ephedrine ingestion. Systolic blood pressure before exercise was significantly increased with both ephedrine treatment trials when compared with the other trials (C+E = 156 +/- 29 mm Hg; E = 150 +/- 14; C = 141 +/- 16; P = 138 +/- 14).
Conclusion
It was concluded that acute ingestion of C+E and E increases muscular endurance during the first set of traditional resistance-training exercise. The performance enhancement was attributed primarily to the effects of E; there was no additive effect of C.
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