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Skeletal muscle morphology and risk of cardiovascular disease in elderly men
Uppsala University, Uppsala, Sweden.
Uppsala University, Uppsala, Sweden.
Uppsala University, Uppsala, Sweden.
Dalarna University, School of Education, Health and Social Studies, Medical Science. Uppsala University, Uppsala, Sweden.ORCID iD: 0000-0002-6933-4637
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2015 (English)In: European Journal of Preventive Cardiology, ISSN 2047-4873, E-ISSN 2047-4881, Vol. 22, no 2, 231-239 p.Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: While it is well known that physical inactivity is a major risk factor for cardiovascular disease, there is still a search for the mechanisms by which exercise exerts its positive effect. Skeletal muscle fibre type can be affected to some extent by exercise, and different fibre types possess different anti-inflammatory and glucometabolic properties that may influence cardiovascular disease risk.

DESIGN: Population-based cohort study.

METHODS: We investigated relations of skeletal muscle morphology to risk of cardiovascular events in a sample of 466 71-year-old men without cardiovascular disease, of which 295 were physically active (strenuous physical activity at least 3 h/week).

RESULTS: During a median of 13.1 years of follow up, 173 major cardiovascular events occurred. Among physically active men, 10% higher proportion of type-I (slow-twitch oxidative) fibres was associated with a hazard ratio (HR) of 0.84 (95% confidence interval 0.74-0.95) for cardiovascular events, and 10% higher proportion of type-IIx (fast-twitch glycolytic) fibres was associated with a HR of 1.24 (1.06-1.45), adjusting for age. Similar results were observed in several sets of multivariable-adjusted models. No association of muscle fibre type with risk of cardiovascular events was observed among physically inactive men.

CONCLUSIONS: Higher skeletal muscle proportion of type-I fibres was associated with lower risk of cardiovascular events and a higher proportion of type-IIx fibres was associated with higher risk of cardiovascular events. These relations were only observed in physically active men. Skeletal muscle fibre composition may be a mediator of the protective effects of exercise against cardiovascular disease.

Place, publisher, year, edition, pages
2015. Vol. 22, no 2, 231-239 p.
National Category
Clinical Medicine
Research subject
Health and Welfare
Identifiers
URN: urn:nbn:se:du-13377DOI: 10.1177/2047487313506828PubMedID: 24092874OAI: oai:DiVA.org:du-13377DiVA: diva2:669012
Available from: 2013-12-02 Created: 2013-11-29 Last updated: 2015-11-27Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
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  • vancouver
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