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Int J Sports Med 2016; 37(02): 149-153
DOI: 10.1055/s-0035-1559690
Nutrition
© Georg Thieme Verlag KG Stuttgart · New York

Creatine Supplementation Increases Total Body Water in Soccer Players: a Deuterium Oxide Dilution Study

R. Deminice
1   Department of Physical Education, State University of Londrina, Londrina, Brazil
,
F. T. Rosa
2   Faculty of Medicine of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, Brazil
,
K. Pfrimer
3   School of Physical Education and Sports of Ribeirao Preto, University of Sao Paulo, Ribeirão Preto – SP, Brazil
,
E. Ferrioli
2   Faculty of Medicine of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, Brazil
,
A. A. Jordao
2   Faculty of Medicine of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, Brazil
,
E. Freitas
3   School of Physical Education and Sports of Ribeirao Preto, University of Sao Paulo, Ribeirão Preto – SP, Brazil
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accepted after revision 25. Juli 2015

Publikationsdatum:
28. Oktober 2015 (online)

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Abstract

This study aimed to evaluate changes in total body water (TBW) in soccer athletes using a deuterium oxide dilution method and bioelectrical impedance (BIA) formulas after 7 days of creatine supplementation. In a double-blind controlled manner, 13 healthy (under-20) soccer players were divided randomly in 2 supplementation groups: Placebo (Pla, n=6) and creatine supplementation (CR, n=7). Before and after the supplementation period (0.3 g/kg/d during 7 days), TBW was determined by deuterium oxide dilution and BIA methods. 7 days of creatine supplementation lead to a large increase in TBW (2.3±1.0 L) determined by deuterium oxide dilution, and a small but significant increase in total body weight (1.0±0.4 kg) in Cr group compared to Pla. The Pla group did not experience any significant changes in TBW or body weight. Although 5 of 6 BIA equations were sensitive to determine TBW changes induced by creatine supplementation, the Kushner et al. [16] method presented the best concordance levels when compared to deuterium dilution method. In conclusion, 7-days of creatine supplementation increased TBW determined by deuterium oxide dilution or BIA formulas. BIA can be useful to determine TBW changes promoted by creatine supplementation in soccer athletes, with special concern for formula choice.

Key words

deuterium body water - bioelectrical impedance - athletes
 

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