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Covariance of isometric and dynamic arm contractions: multivariate genetic analysis.
- Source :
-
Twin Research & Human Genetics . Feb2007, Vol. 10 Issue 1, p180-190. 11p. 2 Diagrams, 3 Charts. - Publication Year :
- 2007
-
Abstract
- The purpose of the present study was to examine genetic and environmental contributions to individual differences in maximal isometric, concentric and eccentric muscle strength and muscle cross-sectional area (MCSA) of the elbow flexors. A generality versus specificity hypothesis was explored to test whether the 4 strength variables share a genetic component or common factors in the environment or whether the genetic/environmental factors are specific for each strength variable. The 4 variables under study were measured in 25 monozygotic and 16 dizygotic male Caucasian twin pairs (22.4 +/- 3.7 years). The multivariate genetic analyses showed that all 4 variables shared a genetic and environmental component, which accounted for 43% and 6% in MCSA (h2 = 81%), 47% and 20% in eccentric (h2 = 65%), 58% and 4% in isometric (h2 = 70%) and 32% and 1% in concentric strength (h2 = 32%) respectively. The remaining variation was accounted for by contraction type specific and muscle cross-sectional area specific genetic and environmental effects, which accounted for 38% and 14% in MCSA, 18% and 15% in eccentric, 12% and 26% in isometric and 0% and 67% in concentric strength respectively. This exploratory multivariate study suggests shared pleiotropic gene action for MCSA, eccentric, isometric and concentric strength, with a moderate to high genetic contribution to the variability of these characteristics. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18324274
- Volume :
- 10
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Twin Research & Human Genetics
- Publication Type :
- Academic Journal
- Accession number :
- 26086568
- Full Text :
- https://doi.org/10.1375/twin.10.1.180