Exercise for patients with major depression: a systematic review with meta-analysis and trial sequential analysis

Area of Science:

• Mental Health
• Exercise Science
• Clinical Research

Background:

• Depression is a prevalent mental health condition requiring effective treatment.
• Exercise is increasingly explored as a complementary therapy for depression.
• Evidence on the efficacy and safety of exercise for depression needs rigorous evaluation.

Purpose of the Study:

• To systematically review the benefits and harms of exercise in patients diagnosed with depression.
• To assess exercise's impact on depression severity, remission rates, and quality of life.
• To evaluate the risk of adverse events, including serious adverse events like suicide.

Main Methods:

• Systematic review of randomized clinical trials (RCTs) up to June 2017.
• Inclusion of 35 trials with 2498 participants diagnosed with depression.
• Primary outcomes: depression severity, remission, serious adverse events. Secondary outcomes: quality of life, other adverse events.

Main Results:

• Overall, exercise showed a small effect on depression severity (SMD -0.66) and remission (RR 0.78), but with very low quality evidence.
• When restricting to trials with lower risk of bias, these effects vanished (SMD -0.11 for severity, RR 0.95 for remission).
• No significant effects were observed for quality of life or during follow-up; data on adverse events were scarce.

Conclusions:

• Trials with lower risk of bias suggest exercise has no significant antidepressant effect.
• Exercise did not demonstrate significant benefits for quality of life or sustained remission.
• Insufficient data preclude conclusions on the safety and harms of exercise in depression treatment.