Abstract:
OBJECTIVES:This study was designed to investigate the association of gender, fibre type composition, and anaerobic performance with the basal skeletal muscle signalling cascades regulating muscle phenotype. DESIGN:Muscle biopsies were obtained from 25 men and 10 women all young and healthy. METHODS:Protein phosphorylation of Thr(172)AMPKα, Ser(221)ACCβ, Thr(286)CaMKII as well as total protein abundance of PGC-1α, SIRT1, and CnA were measured by Western blot and anaerobic performance by the Wingate test. RESULTS:Percent type I myosin heavy chain (MHC I) was lower in men (37.1 ± 10.4 vs. 58.5 ± 12.5, P < .01). Total, free testosterone and free androgen index were higher in men (11.5, 36.6 and 40.6 fold, respectively, P < .01). AMPKα phosphorylation was 2.2-fold higher in men compared to women (P < .01). Total Ser(221)ACCβ and Thr(286)CaMKII fractional phosphorylation tended to be higher in men (P = .1). PGC1-α and SIRT1 total protein expression was similar in men and women, whereas CnA tended to be higher in men (P = .1). Basal AMPKα phosphorylation was linearly related to the percentage of MHC I in men (r = 0.56; P < .01), but not in women. No association was observed between anaerobic performance and basal phosphorylations in men and women, analysed separately. CONCLUSION:In summary, skeletal muscle basal AMPKα phosphorylation is higher in men compared to women, with no apparent effect on anaerobic performance.
journal_name
Eur J Sport Scijournal_title
European journal of sport scienceauthors
Guadalupe-Grau A,Rodríguez-García L,Torres-Peralta R,Morales-Álamo D,Ponce-González JG,Pérez-Suarez I,Santana A,Calbet JAdoi
10.1080/17461391.2015.1063701subject
Has Abstractpub_date
2016-01-01 00:00:00pages
455-64issue
4eissn
1746-1391issn
1536-7290journal_volume
16pub_type
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