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Title: Strength training: importance of genetic factors
Authors: Thomis, Martine ×
Beunen, Gaston
Maes, Hermine
Blimkie, C J
Van Leemputte, Marc
Claessens, Albrecht
Marchal, Guy
Willems, E
Vlietinck, Robert #
Issue Date: Jul-1998
Series Title: Medicine and science in sports and exercise. vol:30 issue:5 pages:724-31
Abstract: PURPOSE: This study focuses on the quantification of genetic and environmental factors in arm strength after high-resistance strength training. METHODS: Male monozygotic (MZ, N = 25) and dizygotic (DZ, N = 16) twins (22.4 +/- 3.7 yr) participated in a 10-wk resistance training program for the elbow flexors. The evidence for genotype*training interaction, or association of interindividual differences in training effects with the genotype, was tested by a two-way ANOVA in the MZ twins and using a bivariate model-fitting approach on pre- and post-training phenotypes in MZ and DZ twins. One repetition maximum (1RM), isometric strength, and concentric and eccentric moments in 110 degree arm flexion at velocities of 30 degrees x s(-1), 60 degrees x s(-1), and 12 degrees x s(-1) were evaluated as well as arm muscle cross-sectional area (MCSA). RESULTS: Results indicated significant positive training effects for all measures except for maximal eccentric moments. Evidence for genotype*training interaction was found for 1RM and isometric strength, with MZ intra-pair correlations of 0.46 and 0.30, respectively. Bivariate model-fitting indicated that about 20% of the variation in post-training 1RM, isometric strength, and concentric moment at 120 degrees x s(-1) was explained by training-specific genetic factors that were independent from genetic factors that explained variation in the pretraining phenotype (30-77%). CONCLUSIONS: Genetic correlations between measures of pre- and post-training strength were indicative for high pleiotropic gene action and minor activation of training-specific genes during training.
ISSN: 0195-9131
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Radiology
Exercise Physiology Research Group
Department of Movement Sciences - miscellaneous
Clinical Genetics Section (-)
Physical Activity, Sports & Health Research Group
× corresponding author
# (joint) last author

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