Bidirectional prospective associations between physical activity and depressive symptoms. The TRAILS Study

Area of Science:

• Adolescent psychology
• Behavioral science
• Mental health research

Background:

• Low physical activity (PA) is linked to adult depression.
• Previous studies on adolescents show mixed results regarding PA and depression.
• The direction of the relationship between PA and depression in adolescents is unclear.

Purpose of the Study:

• Investigate the bidirectional association between PA and depressive symptoms over time in adolescents.
• Determine if the PA-depression link is specific to certain symptom clusters.

Main Methods:

• Assessed depressive symptoms and PA in 2,230 adolescents across three time points (ages 10-17).
• Used the Affective Problems scale and Child Behavior Checklist for depression.
• Employed structural equation modeling to analyze bidirectional effects.

Main Results:

• Found significant inverse relationships in both directions: prior PA predicted later depression, and prior depression predicted later PA.
• Affective depressive symptoms showed a reciprocal link with PA.
• Somatic symptoms did not have a statistically significant association with PA.

Conclusions:

• Confirmed an inverse bidirectional association between PA and general depressive symptoms in adolescents.
• This relationship was specifically linked to affective symptoms, not somatic ones.