Factors affecting the intention-physical activity relationship: intention versus expectation and scale correspondence

Area of Science:

• Behavioral Science
• Health Psychology
• Exercise Science

Background:

• The Theory of Planned Behavior (TPB) is widely used to predict health behaviors.
• Its application to physical activity requires understanding intention and expectation.
• Scale correspondence is a methodological consideration in TPB research.

Purpose of the Study:

• To differentiate intention from expectation in predicting physical activity.
• To assess the impact of scale correspondence on intention-behavior relationships.
• To refine TPB application in the physical activity domain.

Main Methods:

• 170 undergraduates completed questionnaires on TPB constructs.
• Physical activity was self-reported at 2 and 4 weeks.
• Statistical analyses examined intention-expectation distinction and scale correspondence effects.

Main Results:

• Expectation explained 9% more variance in physical activity frequency than intention.
• Scale correspondence significantly enhanced the intention-physical activity correlation.
• Conceptual and methodological factors influence TPB's predictive power.

Conclusions:

• Expectation may be a stronger predictor of physical activity than intention.
• Methodological rigor, like scale correspondence, is crucial for TPB accuracy.
• Further research should refine TPB constructs for physical activity prediction.