Amino Acids

, Volume 37, Issue 2, pp 297–308 | Cite as

Acute and long-term effects of resistance exercise with or without protein ingestion on muscle hypertrophy and gene expression

  • Juha J. Hulmi
  • Vuokko Kovanen
  • Harri Selänne
  • William J. Kraemer
  • Keijo Häkkinen
  • Antti A. Mero
Original Article

Abstract

The effects of timed ingestion of high-quality protein before and after resistance exercise are not well known. In this study, young men were randomized to protein (n = 11), placebo (n = 10) and control (n = 10) groups. Muscle cross-sectional area by MRI and muscle forces were analyzed before and after 21 weeks of either heavy resistance training (RT) or control period. Muscle biopsies were taken before, and 1 and 48 h after 5 × 10 repetition leg press exercise (RE) as well as 21 weeks after RT. Protein (15 g of whey both before and after exercise) or non-energetic placebo were provided to subjects in the context of both single RE bout (acute responses) as well as each RE workout twice a week throughout the 21-week-RT. Protein intake increased (P ≤ 0.05) RT-induced muscle cross-sectional area enlargement and cell-cycle kinase cdk2 mRNA expression in the vastus lateralis muscle suggesting higher proliferating cell activation response with protein supplementation. Moreover, protein intake seemed to prevent 1 h post-RE decrease in myostatin and myogenin mRNA expression but did not affect activin receptor IIb, p21, FLRG, MAFbx or MyoD expression. In conclusion, protein intake close to resistance exercise workout may alter mRNA expression in a manner advantageous for muscle hypertrophy.

Keywords

cdk2 Myostatin Activin receptor IIb Skeletal muscle Whey 

Notes

Acknowledgments

The authors thank Hanna Salmijärvi, Marja Katajavuori, Liisa Kiviluoto, Marko Haverinen, Mikko Pietikäinen, Hermanni Oksanen, Tuomas Kaasalainen, Tuovi Nykänen, Risto Puurtinen, and Aila Ollikainen for their help in data collection and analysis. We also thank the very dedicated group of subjects who made this project possible. The Finnish Ministry of Education and the Ellen and Artturi Nyyssönen Foundation (Juha Hulmi personal grant) supported this research.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Juha J. Hulmi
    • 1
  • Vuokko Kovanen
    • 2
    • 3
  • Harri Selänne
    • 4
  • William J. Kraemer
    • 5
  • Keijo Häkkinen
    • 1
  • Antti A. Mero
    • 1
  1. 1.Department of Biology of Physical ActivityUniversity of JyväskyläJyväskyläFinland
  2. 2.Department of Health SciencesUniversity of JyväskyläJyväskyläFinland
  3. 3.Finnish Centre for Interdisciplinary Gerontology (FCIG)University of JyväskyläJyväskyläFinland
  4. 4.LIKES Research CenterJyväskyläFinland
  5. 5.Human Performance Laboratory, Department of KinesiologyUniversity of ConnecticutStorrsUSA

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