Predicting physical activity intention and behavior in school-age children.

Area of Science:

• Childhood physical activity research
• Behavioral psychology
• Public health interventions

Background:

• Physical activity is crucial for school-aged children's health.
• Predicting and increasing physical activity in children remains a public health challenge.
• Existing models often integrate psychological theories to understand behavior.

Purpose of the Study:

• To test an integrated model predicting physical activity intention and behavior in children.
• To examine the role of self-efficacy in predicting objectively measured physical activity.
• To inform interventions aimed at increasing physical activity in school-aged children.

Main Methods:

• Study 1: Surveyed 645 New Zealand children (11-13 years) using Theory of Planned Behavior and self-efficacy measures, followed by self-reported physical activity.
• Study 2: Measured task and barrier self-efficacy in 67 Canadian children (11-13 years), then objectively measured physical activity using Actical® monitors for high and lower efficacy groups.
• Statistical analyses were used to determine predictors of physical activity and differences in energy expenditure.

Main Results:

• In Study 1, perceived behavioral control and subjective norm predicted intentions, while task and barrier efficacy predicted physical activity.
• In Study 2, children with high self-efficacy demonstrated significantly greater activity-related energy expenditure than those with lower self-efficacy.
• The integrated model showed promise in predicting physical activity intention and behavior.

Conclusions:

• Self-efficacy is a significant predictor of physical activity in school-aged children.
• Interventions targeting self-efficacy may be effective in increasing children's physical activity.
• Findings support the use of psychological theories to promote physical activity in youth.