ERIC Number: EJ849235
Record Type: Journal
Publication Date: 2009-Jul
Abstractor: As Provided
Reference Count: 35
Do Different Measures Tap the Same Genetic Influences? A Multi-Method Study of Activity Level in Young Twins
Saudino, Kimberly J.
Developmental Science, v12 n4 p626-633 Jul 2009
Activity level (AL) is a highly salient feature of child behaviour that has been linked to developmental outcome. Twin studies of parent-rated, observer-rated and mechanically assessed AL in childhood find that AL is genetically influenced. Few studies, however, consider whether different methods of assessing AL have a shared genetic etiology. Those that do, confound methods and situations. The present study examined whether actigraph and rater-based (parent, observer) measures of AL tap the same genetic influences in a sample of 312 2-year-old twin pairs. Methods were studied within the same situation, thereby controlling for situational influences on AL. The genetic correlation between actigraph and parent-rated AL in the home was 0.38, indicating modest genetic overlap between the two methods. In contrast, the correlation of genetic effects on actigraph and observer-rated AL in the laboratory was 0.95, indicating that both laboratory-based measures of AL are influenced by the same genetic effects.
Descriptors: Twins, Genetics, Measurement Techniques, Parents, Etiology, Young Children, Physical Activity Level, Child Development, Developmental Stages, Evaluation Methods
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
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