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Genetic and Extragenetic Variance In Motor Performance

Published online by Cambridge University Press:  01 August 2014

Dan Q. Marisi
Dan Q. Marisi*
Affiliation:
Department of Physical Education, McGill University, Montreal, Quebec, Canada
*
Department of Physical Education, McGill University, 475 Pine Avenue West, Montreal, Quebec H2W 1S4, Canada

Abstract

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A simple additive model of genes plus environment, based on intrapair similarities observed in 35 MZ and 35 like-sexed DZ twin pairs, was used to estimate the relative contribution of genetically controlled phenotypic variance in psychomotor individuality. Subjects practiced 50 trials on a pursuit rotor apparatus under a 20-sec/20-sec, work-rest schedule with a 30 min rest pause allowed between trials 30 and 31. Analyses of the data disclosed that a greater proportion of genetic factors, as opposed to nongenetic factors, appears to account for existing individual differences in motor performance among individuals subject to similar environmental conditions. The strength of this genetic control, however, systematically diminished throughout the course of practice obeying a monotonie trend over trials.

Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 26 , Issue 3-4 , October 1977 , pp. 197 - 204
Copyright
Copyright © The International Society for Twin Studies 1977

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