Descriptive analysis of Iranian adolescents' stages of change for physical activity behavior.

To better understand prevalence of physical inactivity among Iranian adolescents, their physical activity behavior across the hypothesized stages of change derived from the transtheoretical model was investigated in this study. This was a cross-sectional study involving 1551 adolescents, 12-14 years of age (941 boys and 610 girls). Participants were selected through a multistage sampling method.

A model-based educational intervention to increase physical activity among Iranian adolescents.

Objective: To conduct an evaluation of an educational program based on the health promotion model (HPM) and stages of change to improve physical activity (PA) behavior among Iranian adolescents.

Methods: This was a group randomized controlled trial with 165 participants in two groups (intervention/control). Data were collected using self-reported questionnaires based upon HPM constructs (benefits and barriers of action, self-efficacy, activity-related affect, interpersonal influences, and situational influences).