Association between accelerometer-derived physical activity and depression: a cross-sectional study using isotemporal...

Area of Science:

• Public Health
• Epidemiology
• Behavioral Science

Background:

• Depression is a major public health issue.
• Physical activity is a recognized non-pharmacological intervention for depression.
• Understanding the dose-response relationship is key for effective interventions.

Purpose of the Study:

• To investigate the dose-response association between depression and accelerometer-measured physical activity.
• To examine the relationship in the Korean population using the isotemporal substitution model.

Main Methods:

• Cross-sectional analysis of 1543 Korean adults (aged 19-64) from the 2014-2016 KNHANES.
• Physical activity measured via accelerometry for 7 days, categorized as sedentary behavior (SB) or light, moderate, and vigorous physical activity (MVPA).
• Depression assessed using the Patient Health Questionnaire-9 (PHQ-9).

Main Results:

• Both physical activity and SB were associated with depression.
• Moderate-to-vigorous physical activity (MVPA) showed a significant inverse association with depression (OR: 0.817).
• Replacing 30 minutes of SB with MVPA decreased depression odds (OR: 0.815), while replacing MVPA with SB increased odds (OR: 1.227).

Conclusions:

• Evidence supports an association between physical activity levels and depression in the Korean population.
• Reducing sedentary behavior and increasing MVPA are important for depression prevention and management.
• Further research is needed to establish causality and optimal physical activity levels for depression prevention.