Body and Mind Intertwined: Physical Activity Intensity, Sleep Quality, and Depressive Symptoms: Cross-Sectional...

Area of Science:

• Lifestyle Medicine
• Clinical Psychology
• Exercise Science

Background:

• Rising global rates of depression and insomnia, particularly in young adults.
• Need for clinical and lifestyle interventions to address mental health concerns.
• Investigating the role of physical activity (PA) in mitigating depression and insomnia.

Purpose of the Study:

• To assess if habitual physical activity (PA) improves sleep quality and reduces depressive symptoms.
• To explore the mediating role of sleep parameters in the relationship between training intensity and depression.
• To analyze the impact of training intensity, volume, and experience on mental well-being.

Main Methods:

• Cross-sectional study with 349 participants (predominantly young adults).
• Assessed depressive symptoms using Beck Depression Inventory (BDI) and sleep quality via Pittsburgh Sleep Quality Index (PSQI).
• Utilized Structural Equation Modelling (SEM) to analyze mediation effects of PA, sleep, and depression.

Main Results:

• Higher training intensity and volume correlated with lower depressive symptoms (lower BDI scores).
• Sleep quality did not significantly mediate the PA-depression link, except for daytime dysfunction.
• Longer training experience (3-5 years) showed lower BDI scores; PA type was less critical than intensity and consistency.

Conclusions:

• Systematic, high-intensity physical activity (PA) over time is significantly associated with reduced depressive symptoms.
• Training frequency and intensity emerge as crucial factors for mental well-being, warranting further investigation.
• PA demonstrates potential as a mind-body intervention supporting overall mental health.