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Published in: European Journal of Nutrition 1/2014

01-02-2014 | Original Contribution

Contribution of creatine to protein homeostasis in athletes after endurance and sprint running

Authors: Fu-Chun Tang, Chun-Chen Chan, Po-Ling Kuo

Published in: European Journal of Nutrition | Issue 1/2014

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Abstract

Purpose

Few studies have focused on the metabolic changes induced by creatine supplementation. This study investigated the effects of creatine supplementation on plasma and urinary metabolite changes of athletes after endurance and sprint running.

Methods

Twelve male athletes (20.3 ± 1.4 y) performed two identical (65–70 % maximum heart rate reserved) 60 min running exercises (endurance trial) before and after creatine supplementation (12 g creatine monohydrate/day for 15 days), followed by a 5-day washout period. Subsequently, they performed two identical 100 m sprint running exercises (power trial) before and after 15 days of creatine supplementation in accordance with the supplementary protocol of the endurance trial. Body composition measurements were performed during the entire study. Plasma samples were examined for the concentrations of glucose, lactate, branched-chain amino acids (BCAAs), free-tryptophan (f-TRP), glutamine, alanine, hypoxanthine, and uric acid. Urinary samples were examined for the concentrations of hydroxyproline, 3-methylhistidine, urea nitrogen, and creatinine.

Results

Creatine supplementation significantly increased body weights of the athletes of endurance trial. Plasma lactate concentration and ratio of f-TRP/BCAAs after recovery from endurance running were significantly decreased with creatine supplementation. Plasma purine metabolites (the sum of hypoxanthine and uric acid), glutamine, urinary 3-methylhistidine, and urea nitrogen concentrations tended to decrease before running in trials with creatine supplements. After running, urinary hydroxyproline concentration significantly increased in the power trial with creatine supplements.

Conclusions

The findings suggest that creatine supplementation tended to decrease muscle glycogen and protein degradation, especially after endurance exercise. However, creatine supplementation might induce collagen proteolysis in athletes after sprint running.
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Metadata
Title
Contribution of creatine to protein homeostasis in athletes after endurance and sprint running
Authors
Fu-Chun Tang
Chun-Chen Chan
Po-Ling Kuo
Publication date
01-02-2014
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Nutrition / Issue 1/2014
Print ISSN: 1436-6207
Electronic ISSN: 1436-6215
DOI
https://doi.org/10.1007/s00394-013-0498-6

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