Abstract

CHAVES, Raquel Nichele de et al. Variability in motor coordination: an approach based on the twin design. Rev. bras. educ. fís. esporte [online]. 2012, vol.26, n.2, pp.301-311. ISSN 1807-5509.  http://dx.doi.org/10.1590/S1807-55092012000200012.

The purpose of this study was to estimate the contribution of environmental and genetic factors on the variability of interindividual performance in motor coordination. Sample comprised 64 twin pairs, aged 5 to 14 years old, from Portugal. Motor coordination was evaluated by KTK battery: backward balance (ER); hopping on one leg (SM); shifting platforms (TL); jumping sideways (SL). Intraclass correlation coefficient (t) was calculated. Contributions of genetic (a²), shared (c²) and unique environmental (e²) factors were estimated. Our results showed t values higher in monozygotic twins, suggesting the presence of genetic factors. Nevertheless, a² estimates were low, ranging from 15% (TL) to 41% (SM), while to common environment (c²) ranged from 46% (SL) to 58% (TL), and unique effects ranged from 11% (SM) to 28% (TL). These results suggest that environmental factors are responsible for the greatest part of influence on variability of interindividual performance in motor coordination tests.

Keywords : Motor coordination; Quantitative genetic; KTK.

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