Effects of Coffee and Caffeine Anhydrous Intake During Creatine Loading
Trexler ET, Smith-Ryan AE, Roelofs EJ, Hirsch KR, Persky AM, Mock MG
Journal of strength and conditioning research · 14 citas
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
- National Institutes of Health
- Gobierno
- National Center for Advancing Translational Sciences
- Gobierno
- NCATS NIH HHS
- Subvenciones
- National Center for Advancing Translational Sciences (1KL2TR001109); National Center for Advancing Translational Sciences (KL2TR001109); National Institutes of Health (1KL2TR001109)
Según 3 financiadores declarados.
Publicación
- Publicado
- 2015-10-13 · J Strength Cond Res · vol. 30 · número 5 · págs. 1438–1446
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 18 citas · más que el 65% de estudios similares · 0.5× el promedio de su campo
- Referencias
- 50 trabajos
- Acceso
- Acceso abierto (copia en repositorio)
- Áreas de investigación
- Muscle metabolism and nutrition · Coffee research and impacts · Sports Performance and Training
- Palabras clave
- creatine monohydrate, coffee, creatine loading, resistance training, sprint performance, peak power, total power, serum creatinine, dietary supplementation, bench press, leg press
- MeSH
- muscle, skeletal, humans, creatine, caffeine, exercise test, exercise, muscle fatigue, running, coffee, dietary supplements, adolescent, adult, male, muscle strength, young adult
6 autores
- Eric T. Trexler🇺🇸University of North Carolina at Chapel Hill
- Abbie E. Smith‐Ryan🇺🇸 · autor de correspondenciaUniversity of North Carolina at Chapel Hill
- Erica J. Roelofs🇺🇸University of North Carolina at Chapel Hill
- Katie R. Hirsch🇺🇸University of North Carolina at Chapel Hill
- Adam M. Persky🇺🇸University of North Carolina at Chapel Hill
- Meredith G. Mock🇺🇸University of North Carolina at Chapel Hill
Resumen
El texto original del estudio, en el idioma en que se publicó.
The purpose of this study was to determine the effect of 5 days of creatine (CRE) loading alone or in combination with caffeine anhydrous (CAF) or coffee (COF) on upper-body and lower-body strength and sprint performance. Physically active males (n = 54; mean ± SD; age = 20.1 ± 2.1 years; weight = 78.8 ± 8.8 kg) completed baseline testing, consisting of 1 repetition maximum (1RM) and repetitions to fatigue with 80% 1RM for bench press and leg press, followed by a repeated sprint test of five, 10-second sprints separated by 60-second rest on a cycle ergometer to determine peak power (PP) and total power (TP). At least 72 hours later, subjects were randomly assigned to supplement with CRE (5 g of CRE monohydrate, 4 times per day; n = 14), CRE + CAF (CRE +300 mg·d of CAF; n = 13), CRE + COF (CRE +8.9 g of COF, yielding 303 mg of CAF; n = 13), or placebo (PLA; n = 14) for 5 days. Serum creatinine (CRN) was measured before and after supplementation, and on day 6, participants repeated pretesting procedures. Strength measures were improved in all groups (p ≤ 0.05), with no significant time × treatment interactions. No significant interaction or main effects were observed for PP. For TP, a time × sprint interaction was observed (p ≤ 0.05), with no significant interactions among treatment groups. A time × treatment interaction was observed for serum CRN values (p ≤ 0.05) that showed increases in all groups except PLA. Four subjects reported mild gastrointestinal discomfort with CRE + CAF, with no side effects reported in other groups. These findings suggest that neither CRE alone nor in combination with CAF or COF significantly affected performance compared with PLA.
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