Journal Article

Creatine supplementation does not affect kidney function in an animal model with pre‐existing renal failure

Youri E. C. Taes, Joris R. Delanghe, Birgitte Wuyts, Johan van de Voorde and Norbert H. Lameire

in Nephrology Dialysis Transplantation

Published on behalf of European Renal Association - European Dialysis and Transplant Assoc

Volume 18, issue 2, pages 258-264
Published in print February 2003 | ISSN: 0931-0509
Published online February 2003 | e-ISSN: 1460-2385 | DOI: http://dx.doi.org/10.1093/ndt/18.2.258
Creatine supplementation does not affect kidney function in an animal model with pre‐existing renal failure

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Background. Creatine is widely used as an ergogenic substance among athletes. Safety of prolonged creatine intake has been questioned, based upon case reports and animal data. We investigated the effect of prolonged creatine ingestion on renal function in animals with normal kidney function or pre‐existing kidney failure, respectively.

Methods. Male Wistar rats were randomly allocated to four experimental groups: (i) sham‐operated, control diet; (ii) sham‐operated, creatine‐supplemented diet (2% w/w (0.9±0.2 g creatine/kg body weight/day)); (iii) two‐thirds nephrectomized, control diet; and (iv) two‐thirds nephrectomized, creatine supplemented diet. Glomerular filtration rate was determined using inulin and creatinine clearance, together with albumin excretion, urea clearance, muscle and serum creatine and serum cystatin C concentrations.

Results. In contrast to previous reports, no detrimental effects of creatine supplementation on the renal function indices were observed in two‐thirds nephrectomized or sham‐operated animals. No differences were observed in inulin (0.28±0.08 vs 0.25±0.08 ml/min/100 g; P=NS) or creatinine clearance rates. Serum cystatin C concentration, urinary protein excretion, and albumin and urea clearance were comparable between creatine‐supplemented and control‐diet fed animals in both sham‐operated and two‐thirds nephrectomized animals. Serum creatine and intramuscular total creatine concentrations were higher in creatine‐supplemented groups (P<0.05).

Conclusions. Creatine supplementation at a dosage of 2% w/w for 4 weeks does not impair kidney function in animals with pre‐existing renal failure or in control animals.

Keywords: creatine supplementation; kidney function

Journal Article.  3612 words.  Illustrated.

Subjects: Nephrology

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