Effects of creatine supplementation on isometric force-time curve characteristics
Bemben MG, Tuttle TD, Bemben DA, Knehans AW
Medicine and science in sports and exercise · 9 citas
Etiquetas de revisión
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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
- 2001-11-01 · Med Sci Sports Exerc · vol. 33 · número 11 · págs. 1876–1881
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 24 citas · más que el 70% de estudios similares · 0.9× el promedio de su campo
- Referencias
- 30 trabajos
- Acceso
- De pago
- Áreas de investigación
- Muscle metabolism and nutrition · Sports Performance and Training · Biochemical effects in animals
- Palabras clave
- creatine monohydrate, creatine supplementation, rate of force development, muscular endurance, maximal strength, knee flexors, elbow flexors and extensors, sedentary young men, untrained men, total impulse
- MeSH
- knee, elbow, muscle, skeletal, body water, humans, creatine, life style, physical endurance, isometric contraction, reference values, dietary supplements, adolescent, adult, male
4 autores
- Michael G. Bemben🇺🇸University of Oklahoma Health Sciences Center; University of Oklahoma
- TROY D. TUTTLE🇺🇸University of Oklahoma Health Sciences Center; University of Oklahoma
- Debra A. Bemben🇺🇸University of Oklahoma Health Sciences Center; University of Oklahoma
- ALLEN W. KNEHANS🇺🇸University of Oklahoma Health Sciences Center; University of Oklahoma
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
To assess the effects of creatine monohydrate on isometric force-time curve parameters of sedentary college males aged 18-25 yr.
Methods
This double-blind study randomly assigned subjects to either a treatment (with creatine (Cr)) group (N = 11) or placebo group (P) (N = 8). The Cr group received 20 g x d(-1) of Cr for the first 5 d, in 5-g doses, four times daily (loading period) followed by a 5-g x d(-1) dose for the next 5 d (maintenance phase) and then no Cr ingestion for 7 d (washout period). Each 5-g dose was mixed with 250 mL of Gatorade. The P group received a placebo (cornstarch) following the exact same dosage regimen and protocol as the Cr group. All subjects were sedentary and had not used any nutritional supplements for 6 months before the study. Measurements of isometric force production of four muscle groups (elbow flexors and extensors; knee flexors and extensors) were characterized by a number of force-time parameters including strength (MF), time to maximal force (TMF), rate of force development (MRFD), and intermittent endurance (total impulse (TI) and percent force decrement (PFD)). Testing was done at pretreatment, after the 10-d loading and maintenance phases, and after the washout phase.
Results
Repeated measures ANOVA indicated no significant group effect for any muscle group concerning the maximal strength parameters and only two significant time effects for the knee flexors during MF and MRFD. Similarly, there were no significant group effects for any muscle group during the endurance trials; however, there was a significant time effect concerning TI for each muscle group tested.
Conclusion
Our findings indicate that oral supplementation with creatine monohydrate in untrained males does not positively influence isometric strength but may enhance intermittent isometric muscular endurance.
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