This study examined the relative contributions of sex, social class, socioeconomic status of the family, and exercise behavior of significant others (father, mother, sister, brother, best friend) to the variability of physical activities of 13–15-year-old urban adolescents (N = 475). Physical activity was measured using 7-day physical activity recall. Family income was negatively correlated with physical activity of adolescents. Physical activity of the father, older brother, and best friend was associated with a higher activity level of adolescents (r = 0.24–0.33). Sex and social class of the families accounted for 18% of the variance of the adolescents’ physical activity. When the physical activity of the father, older brother, and best friend were entered into regression analysis, a total of 32% of the variation in adolescents’ physical activity was explained. Physical activity of adolescents is associated with sex, activity levels of significant others, and socioeconomic status of the family.
The authors are with Institute of Sport Pedagogy at the University of Tartu, Tartu, 51014 Estonia.