Document Detail


The development of reaching across the first year in twins of known placental type.
MedLine Citation:
PMID:  17392566     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study explored the genetic and prenatal environmental influences on the development of reaching in twins. Detailed kinematic measures of arm movements and underlying muscle co-activation from two sets of monozygotic twins (MZ; one set was monochorionic; the other was dichorionic) and one set of dizygotic (DZ) were measured weekly from reach onset to 30 weeks, then bi-weekly to 1 year of age. Improvements in trajectories were not linear, but the MZ twins demonstrated higher correlations between kinematic variables compared to DZ twins and unrelated infants. Although all infants showed increase in muscle co-activation across the year, MZ twins showed no more correlations in muscle states than DZ twins or unrelated infants. The results suggest that reaches are not planned at the level of the muscles, and that anatomical, biomechanical, and energetic factors act as strong constraints on the inherent kinematic and muscle variability.
Authors:
Melissa W Clearfield; Jing Feng; Esther Thelen
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Twin Study    
Journal Detail:
Title:  Motor control     Volume:  11     ISSN:  1087-1640     ISO Abbreviation:  Motor Control     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2007-03-29     Completed Date:  2007-05-30     Revised Date:  2007-12-03    
Medline Journal Info:
Nlm Unique ID:  9706297     Medline TA:  Motor Control     Country:  United States    
Other Details:
Languages:  eng     Pagination:  29-53     Citation Subset:  IM    
Affiliation:
Dept of Psychology, Whitman College, Walla Walla, WA 99362, USA.
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MeSH Terms
Descriptor/Qualifier:
Biomechanics
Child Development / physiology*
Electromyography
Functional Laterality / genetics*
Humans
Individuality
Infant
Infant, Newborn
Kinesthesis / genetics*
Male
Motor Skills / physiology*
Orientation / physiology*
Psychomotor Performance / physiology*
Twins, Dizygotic / genetics*,  psychology
Twins, Monozygotic / genetics*,  psychology
Grant Support
ID/Acronym/Agency:
HD223800/HD/NICHD NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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