Document Detail


Muscle Protein Synthetic Responses to Exercise: Effects of Age, Volume, and Intensity.
MedLine Citation:
PMID:  22859389     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We explored the relationships between resistance exercise volume/intensity and muscle myofibrillar protein synthetic (MPS) responses in young and older men. In a crossover design, four groups of six young (24±6 years) and older (70±5 years) men performed two volumes of resistance exercise: either 40% one repetition maximum (1RM) (3 × 14, then 6 × 14 repetitions) or 75% 1RM (3 × 8, then 6 × 8 repetitions), such that at the same volume, work was identical between intensities. Muscle biopsies were taken 0, 1, 2, and 4hours after exercise to measure MPS via myofibrillar bound [1,2-(13)C(2)]leucine and indices of mammalian target of rapamycin signaling by immunoblotting. In younger men, doubling exercise volume produced limited added effects, whereas in older men, it resulted in greater MPS and p70S6 kinase (p70S6K(Thr389)) phosphorylation at both intensities, that is, MPS area under the curve: 75% (1× volume: 0.07±0.01 vs 2× volume: 0.14% ± 0.02% protein synthesized/4hours (p < .001). Doubling exercise volume is a valid strategy to maximize postexercise MPS in ageing.Decision Editor: Rafael de Cabo, PhD.
Authors:
Vinod Kumar; Philip J Atherton; Anna Selby; Debbie Rankin; John Williams; Kenneth Smith; Natalie Hiscock; Michael J Rennie
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-2
Journal Detail:
Title:  The journals of gerontology. Series A, Biological sciences and medical sciences     Volume:  -     ISSN:  1758-535X     ISO Abbreviation:  J. Gerontol. A Biol. Sci. Med. Sci.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9502837     Medline TA:  J Gerontol A Biol Sci Med Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Division of Metabolic and Molecular Physiology, School of Graduate Entry Medicine and Health, Royal Derby Hospital, Uttoxeter Road, Derby, DE22 3DT, UK. philip.atherton@nottingham.ac.uk.
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