Effects of Creatine and Carbohydrate Loading on Cycling Time Trial Performance

ABSTRACTIntroductionCreatine (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.MethodsEighteen well-trained (~65 mL·kg−1·min−1 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−1 for 5 d + 3 g·d−1 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−1 body mass (BM) per day; MOD) or CHO-loaded (12 g·kg−1 BM·d−1; LOAD) diets before PT2 and PT3. Muscle biopsies were taken before PT1, 18 h after PT1, and before both PT2 and PT3.ResultsNo significant differences in overall TT or inclined ride times were observed between intervention groups. PLA + LOAD improved power above baseline (P

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