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Exercise Intervention for Late-Life Depression: A Meta-Analysis.

Sivan Klil-Drori1,2, Adi J Klil-Drori3, Shamira Pira4

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Physical exercise intervention (PEI) moderately reduces depressive symptoms in older adults. However, effectiveness varies, especially for those over 80 or with cognitive decline.

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Area of Science:

  • Gerontology
  • Psychiatry
  • Exercise Science

Background:

  • Late-life depression is a significant public health concern.
  • Physical exercise intervention (PEI) is a potential non-pharmacological treatment for depression in older adults.
  • Evidence on the efficacy of PEI for reducing depressive symptoms in this population requires synthesis.

Purpose of the Study:

  • To systematically review and quantify the association between physical exercise intervention (PEI) and the reduction of depressive symptoms in older adults.
  • To assess the overall effect size and identify factors contributing to heterogeneity in treatment outcomes.

Main Methods:

  • A comprehensive literature search was conducted across MEDLINE, PsycINFO, and EMBASE databases up to December 2018.
  • Randomized controlled trials (RCTs) comparing supervised, moderate-to-vigorous PEI with sedentary control groups in adults aged 60 years and older were included.
  • Random-effects meta-analysis was employed to pool standardized mean differences (Hedges g) in depressive symptom scores.

Main Results:

  • Nine RCTs involving 1,308 participants (mean age 82 years) were analyzed.
  • PEI demonstrated a medium effect size (Hedges g = 0.64) in reducing depressive symptoms among older adults.
  • Significant heterogeneity was observed (I² = 78.0%), with age over 80, lower Mini-Mental State Examination (MMSE) scores (<23), and absence of baseline depressive symptoms contributing to variability.

Conclusions:

  • Supervised physical exercise interventions offer a moderate benefit in alleviating depressive symptoms in the elderly population.
  • Further research is warranted to optimize PEI for specific subgroups, including individuals over 80 years or those with cognitive impairment (MMSE < 23).
  • Inconsistent reporting of fitness metrics and adherence, alongside a high risk of bias in several studies, highlights the need for improved methodological rigor in future trials.