Effects of Creatine and Carbohydrate Loading on Cycling Time Trial Performance
Tomcik KA, Camera DM, Bone JL, Ross ML, Jeacocke NA, Tachtsis B, Senden J, VAN Loon LJC, Hawley JA, Burke LM
Medicine and science in sports and exercise · 23 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
- 2017-08-11 · Med Sci Sports Exerc · vol. 50 · número 1 · págs. 141–150
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 31 citas · más que el 66% de estudios similares · 0.7× el promedio de su campo
- Referencias
- 41 trabajos
- Acceso
- De pago
- Áreas de investigación
- Muscle metabolism and nutrition · Exercise and Physiological Responses · Cardiovascular and exercise physiology
- Palabras clave
- Sprint, Cycling, Time trial, Creatine, Animal science, Placebo, Medicine, Crossover study, Carbohydrate, Internal medicine, Physical therapy, Biology, Heart rate, Blood pressure
- MeSH
- muscle, skeletal, humans, body weight, creatine, glycogen, cross-over studies, oxygen consumption, physical endurance, bicycling, adult, male, sports nutritional physiological phenomena, diet, carbohydrate loading
10 autores
- KRISTYEN A. TOMCIK🇦🇺Australian Catholic University
- DONNY MICHAEL CAMERA🇦🇺Australian Catholic University
- Julia L. Bone🇦🇺Australian Sports Commission; Australian Sports Commission; ACT Government; Australian Catholic University
- MEGAN L. R. ROSS🇦🇺Australian Sports Commission; Australian Sports Commission; ACT Government; Australian Catholic University
- NIKKI A. JEACOCKE🇦🇺Australian Sports Commission; Australian Sports Commission; ACT Government
- Bill Tachtsis🇦🇺Australian Catholic University
- Joan M. Senden🇳🇱Maastricht University Medical Centre; Maastricht University
- Luc J. C. van Loon🇳🇱🇦🇺Maastricht University Medical Centre; Maastricht University; Australian Catholic University
- John A. Hawley🇬🇧🇦🇺Liverpool John Moores University; Australian Catholic University
- Louise M. Burke🇦🇺Australian Sports Commission; Australian Sports Commission; ACT Government; Australian Catholic University
Resumen
El texto original del estudio, en el idioma en que se publicó.
Introduction
Creatine (Cr) and carbohydrate loadings are dietary strategies used to enhance exercise capacity. This study examined the metabolic and performance effects of a combined CR and CHO loading regiment on time trial (TT) cycling bouts.
Methods
Eighteen well-trained (~65 mL·kg·min V˙O2peak) men completed three performance trials (PT) that comprised a 120-km cycling TT interspersed with alternating 1- and 4-km sprints (six sprints each) performed every 10 km followed by an inclined ride to fatigue (~90% V˙O2peak). Subjects were pair matched into either CR-loaded (20 g·d for 5 d + 3 g·d for 9 d) or placebo (PLA) groups (n = 9) after the completion of PT1. All subjects undertook a crossover application of the carbohydrate interventions, consuming either moderate (6 g·kg body mass (BM) per day; MOD) or CHO-loaded (12 g·kg BM·d; LOAD) diets before PT2 and PT3. Muscle biopsies were taken before PT1, 18 h after PT1, and before both PT2 and PT3.
Results
No significant differences in overall TT or inclined ride times were observed between intervention groups. PLA + LOAD improved power above baseline (P < 0.05) during the final 1-km sprint, whereas CR + MOD and CR + LOAD improved power (P < 0.05) during the final 4-km sprint. Greater power was achieved with MOD and LOAD compared with baseline with PLA (P < 0.05). CR increased pre-PT BM compared with PLA (+1.54% vs +0.99% from baseline). CR + LOAD facilitated greater [total CR] (P < 0.05 vs baseline) and muscle [glycogen] (P < 0.01 vs baseline and MOD) compared with PLA + LOAD. Mechanistic target of rapamycin decreased from baseline after glycogen depletion (~30%; P < 0.05).
Conclusions
Power output in the closing sprints of exhaustive TT cycling increased with CR ingestion despite a CR-mediated increase in weight. CR cosupplemented with carbohydrates may therefore be beneficial strategy for late-stage breakaway moments in endurance events.
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