The dissertation examines the links between moderate-to-vigorous physical activity (MVPA) among family members. The sample included 174 children and adolescents, 225 parents, and 52 grandparents from 152 extended families. Physical activity and sedentary time were measured with accelerometers, physical fitness with standardized tasks, and parental support with a questionnaire. Key findings are: (i) mothers’ MVPA predicts children’s MVPA (p < 0.005), with a stronger effect in boys; (ii) mothers’ sedentary time combined with older age explains sedentary behavior in sons (p < 0.05, R² = 0.197); (iii) siblings’ average MVPA shows no significant influence on children’s MVPA (p = 0.067); (iv) the strongest fitness associations appear in strength between mothers and sons (r = 0.30) and aerobic endurance between parents and children (r = 0.25); (v) parental support affects boys’ MVPA (p < 0.001, R² = 0.18) and represents the most common form of parental support. The findings of this dissertation contribute to a better understanding of the intergenerational transmission of physical activity habits and the importance of family support.
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