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Revista Brasileira de Medicina do Esporte

Print version ISSN 1517-8692

Abstract

ZANELLI, José Carlos Sales; CORDEIRO, Braian Alves; BESERRA, Bruna Teles Soares  and  TRINDADE, Erasmo Benício Santos de Moraes. Creatine and resistance training: effect on hydration and lean body mass. Rev Bras Med Esporte [online]. 2015, vol.21, n.1, pp.27-31. ISSN 1517-8692.  http://dx.doi.org/10.1590/1517-86922015210101932.

INTRODUCTION:

creatine is an ergogenic aid which supplementation has been associated to increased hydration and increased muscle mass of consumers. However, researchers have questioned whether the increase in muscle mass is a real gain.

OBJECTIVE:

to evaluate the effect of creatine supplementation on hydration and increased lean mass in individuals previously trained and untrained, under a resistance training program.

METHODS:

clinical non-randomized study, consisting of three moments, M1 - start of 20g/day creatine supplementation; M2 - 7 days after the beginning of supplementation and reduction to 5g/day; M3 - 28 days of supplementation. In the proposed moments were made measurements of weight, height and evaluation of body composition (lean mass, total body water) using the BYODINAMICS (r) Model 310. For all statistical tests, we used a significance level of 95% (p<0.05).

RESULTS:

14 adult male volunteers with a mean age of 22.57 (±1.45) years, including seven trained and seven untrained individuals, participated in the study. After 28 days of supplementation, the trained group had a significant increase in weight, total body water, lean body mass and hydration of lean mass, but no significant increase was observed in the untrained group. Regarding the phase angle, it increased in the untrained group and decreased in the trained group.

CONCLUSION:

creatine supplementation combined with resistance training is more effective in hydrating trained individuals and it's also sufficient to reduce the difference of the angle phase intergroup, thus suggesting improved cellular hydration in both groups. However, this increase in hydration revealed no significant increase in muscle tissue.

Keywords : body composition; body water; phosphocreatine.

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