Sirilak Nutamonwarakul. Effect of creatine supplement at two different doses on performance of Thai swimmers . Master's Degree(Exercise Physiology). Mahidol University. : Mahidol University, 2004.
Effect of creatine supplement at two different doses on performance of Thai swimmers
Abstract:
Creatine has been used to enhance explosive performances in many athletes.
However, studies in swimmers have yielded conflicting results. In addition, there has
been no report in Thai swimmers. The present study intends to investigate the effect
of creatine supplementation on body composition and physical fitness of Thai
collegiate swimmers and its effect on swimming performance.
A randomized, double-blind crossover design was employed using fourteen
male and female swimmers. Over a five-day treatment period, each of two groups
were given one of three treatments: placebo, low dose of creatine (5 grams per day),
and high dose (20 grams per day), followed by the other treatments after a 30 day
washout period. Before and five days after each treatment, body composition, blood
creatinine, anaerobic capacity, and swimming performance were measured. There was
no effect of creatine at either dose on body composition and blood creatinine.
However, anaerobic capacity increased and fatigue index decreased after high dose
creatine administration. On the other hand, 50-meter swimming speed significantly
increased after both low and high doses of creatine supplementation.
This study shows a positive effect of creatine supplementation, especially at a
high dose, on the swimming performance of Thai collegiate swimmers. Such
treatment appears to have no undesirable effect on body weight and kidney function