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Adolescents' self-efficacy to overcome barriers to Physical Activity Scale
John J M Dwyer1, Tala Chulak, Scott Maitland
1Department of Family Relations and Applied Nutrition at the University of Guelph, College of Social and Applied Human Sciences, Ontario, Canada. dwyer@uoguelph.ca
Abstract:
This paper describes a revised measure of self-efficacy to overcome barriers to moderate and vigorous physical activity in a sample of 484 high school students in Toronto, Ontario. The students had a mean age of 15.3 years. Principal axis factoring with oblique rotation yielded five factors: self-efficacy to overcome internal, harassment, physical environment, social environment, and responsibilities barriers. Two problematic items were removed, which resulted in a 22-item measure. Subsequent analyses were conducted on responses to this shortened measure. Confirmatory factor analysis supported the five-factor model and demonstrated age- and sex-invariance. The subscales had good internal consistency reliability. Structural regressions demonstrated a strong relationship between the resulting factors and a physical activity measure (energy expenditure), showing predictive validity.
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