Abstract | PURPOSE:
Creatine (Cr) supplementation may improve muscle functional capacity in patients with neuromuscular diseases, disuse atrophy, or muscular dystrophies. Activation of myogenic satellite cells has been reported to be enhanced by Cr both in vitro and in vivo. Therefore, we hypothesized that Cr supplementation may improve the early steps of regeneration after muscle injury and may accelerate the recovery of both muscle mass and phenotype. METHODS: RESULTS: Cr supplementation accelerated the recovery of muscle Cr content during the regeneration phase. Although there were no other differences between Cr-treated and nontreated rats, we observed that 1) regenerated muscle mass remained lower than that in intact muscle mass 42 d after injury, 2) PCNA and MRF expression strongly increased in regenerated muscles, 3) the MHC profile of regenerated muscles was recovered 28 d after injury, and 4) CS activity was fully recovered from day 14, whereas the specific H isozyme of lactate dehydrogenase activity remained lower than that in intact muscles until 42 d. CONCLUSIONS: In contrast with results from in vitro studies, Cr supplementation had no effects in vivo on the time course of recovery of rat skeletal muscle mass and phenotype after notexin-induced injury.
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Authors | Brigitte Crassous, Hélène Richard-Bulteau, Louise Deldicque, Bernard Serrurier, Marielle Pasdeloup, Marc Francaux, Xavier Bigard, Nathalie Koulmann |
Journal | Medicine and science in sports and exercise
(Med Sci Sports Exerc)
Vol. 41
Issue 9
Pg. 1761-9
(Sep 2009)
ISSN: 1530-0315 [Electronic] United States |
PMID | 19657293
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Pregnancy Proteins
- Prl7d1 protein, rat
- Creatine
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Topics |
- Animals
- Creatine
(administration & dosage, metabolism)
- Female
- Muscle, Skeletal
(drug effects, injuries, physiology)
- Phenotype
- Pregnancy Proteins
(blood)
- Rats
- Rats, Wistar
- Regeneration
(drug effects)
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