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Erschienen in: European Journal of Nutrition 1/2014

01.02.2014 | Original Contribution

Positive muscle protein net balance and differential regulation of atrogene expression after resistance exercise and milk protein supplementation

verfasst von: Søren Reitelseder, Jakob Agergaard, Simon Doessing, Ida C. Helmark, Peter Schjerling, Gerrit van Hall, Michael Kjaer, Lars Holm

Erschienen in: European Journal of Nutrition | Ausgabe 1/2014

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Abstract

Purpose

Resistance exercise and amino acid availability are positive regulators of muscle protein net balance (NB). However, anabolic responses to resistance exercise and protein supplementation deserve further elucidation. The purpose was to compare intakes of whey, caseinate (both: 0.30 g/kg lean body mass), or a non-caloric control after heavy resistance exercise on protein turnover and mRNA expressions of forkhead homeobox type O (FOXO) isoforms, muscle RING finger 1 (MuRF1), and Atrogin1 in young healthy males.

Methods

Protein turnover was determined by stable isotope-labeled leucine and femoral arteriovenous blood samples at rest and during 6-h recovery. Muscle biopsies were collected at −60 min (rest) and at 60, 210, and 360 min in the recovery period.

Results

During recovery, leucine NB was significantly higher in the protein groups compared to control (P < 0.001). Differences in leucine NB, rate of disappearance, and oxidation were observed in the early recovery period between whey and caseinate. FOXO1A and MuRF1 were upregulated at 60 and 210 min, and, in contrast, FOXO3 and Atrogin1 were downregulated at 210 and 360 min. For leucine rate of appearance and all FOXO and atrogene mRNA expressions, no differences were observed between groups.

Conclusions

Whey and caseinate were equally superior to control in the 6-h recovery period and displayed temporal differences with whey having a fast and superior effect in the early part of the recovery period. Effects on mRNA expressions indicate different regulatory mechanisms on the ubiquitin ligases MuRF1 and Atrogin1 in recovery from heavy resistance exercise.
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Metadaten
Titel
Positive muscle protein net balance and differential regulation of atrogene expression after resistance exercise and milk protein supplementation
verfasst von
Søren Reitelseder
Jakob Agergaard
Simon Doessing
Ida C. Helmark
Peter Schjerling
Gerrit van Hall
Michael Kjaer
Lars Holm
Publikationsdatum
01.02.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Nutrition / Ausgabe 1/2014
Print ISSN: 1436-6207
Elektronische ISSN: 1436-6215
DOI
https://doi.org/10.1007/s00394-013-0530-x

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