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  • Author: Shelia L. Broyles x
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Charles F. Morgan, Thomas L. McKenzie, James F. Sallis, Shelia L. Broyles, Michelle M. Zive and Philip R. Nader

We examined associations of demographic/biological, psychological, social, and environmental variables with two different measures (self-reported and accelerometer) of physical activity (PA) in Mexican-American (56 boys; 64 girls) and European-American (49 boys; 45 girls) children (mean age = 12.1 years). Among 32 potential correlates, 4 gender and 16 ethnic differences were found. Percent of variance explained from 3% to 24% for self-reported PA and from 7% to 16% for accelerometer-measured PA. Physical self-perception was the only variable with a significant association across all subgroups and both measures. Less favorable levels of psychosocial variables among Mexican-Americans may explain ethnic differences in PA.

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Ronald J. Iannotti, James F. Sallis, Rusan Chen, Shelia L. Broyles, John P. Elder and Philip R. Nader


Longitudinal patterns in the development of physical activity (PA) and potential causal relationships between parent and child PA are examined.


Autoregressive models were used to examine bidirectional prospective paths between parent and child PA in a longitudinal sample of 351 Anglo and Mexican American families. PA was assessed independently in children and parents over a 13-y period.


There was little evidence for a causal path from mother PA to child PA.


Modeling does not appear to be the primary mechanism by which parents influence children’s PA behavior. Studies examining relations between parent and child behaviors should not rely on a single respondent for assessing both parent and child PA or on cross-sectional correlational data to make unidirectional causal inferences about determinants of child PA.