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Meta-Analysis
. 2013 Sep 12;2013(9):CD004366.
doi: 10.1002/14651858.CD004366.pub6.

Exercise for depression

Affiliations
Meta-Analysis

Exercise for depression

Gary M Cooney et al. Cochrane Database Syst Rev. .

Abstract

Background: Depression is a common and important cause of morbidity and mortality worldwide. Depression is commonly treated with antidepressants and/or psychological therapy, but some people may prefer alternative approaches such as exercise. There are a number of theoretical reasons why exercise may improve depression. This is an update of an earlier review first published in 2009.

Objectives: To determine the effectiveness of exercise in the treatment of depression in adults compared with no treatment or a comparator intervention.

Search methods: We searched the Cochrane Depression, Anxiety and Neurosis Review Group's Controlled Trials Register (CCDANCTR) to 13 July 2012. This register includes relevant randomised controlled trials from the following bibliographic databases: The Cochrane Library (all years); MEDLINE (1950 to date); EMBASE (1974 to date) and PsycINFO (1967 to date). We also searched www.controlled-trials.com, ClinicalTrials.gov and the WHO International Clinical Trials Registry Platform. No date or language restrictions were applied to the search.We conducted an additional search of the CCDANCTR up to 1st March 2013 and any potentially eligible trials not already included are listed as 'awaiting classification.'

Selection criteria: Randomised controlled trials in which exercise (defined according to American College of Sports Medicine criteria) was compared to standard treatment, no treatment or a placebo treatment, pharmacological treatment, psychological treatment or other active treatment in adults (aged 18 and over) with depression, as defined by trial authors. We included cluster trials and those that randomised individuals. We excluded trials of postnatal depression.

Data collection and analysis: Two review authors extracted data on primary and secondary outcomes at the end of the trial and end of follow-up (if available). We calculated effect sizes for each trial using Hedges' g method and a standardised mean difference (SMD) for the overall pooled effect, using a random-effects model risk ratio for dichotomous data. Where trials used a number of different tools to assess depression, we included the main outcome measure only in the meta-analysis. Where trials provided several 'doses' of exercise, we used data from the biggest 'dose' of exercise, and performed sensitivity analyses using the lower 'dose'. We performed subgroup analyses to explore the influence of method of diagnosis of depression (diagnostic interview or cut-off point on scale), intensity of exercise and the number of sessions of exercise on effect sizes. Two authors performed the 'Risk of bias' assessments. Our sensitivity analyses explored the influence of study quality on outcome.

Main results: Thirty-nine trials (2326 participants) fulfilled our inclusion criteria, of which 37 provided data for meta-analyses. There were multiple sources of bias in many of the trials; randomisation was adequately concealed in 14 studies, 15 used intention-to-treat analyses and 12 used blinded outcome assessors.For the 35 trials (1356 participants) comparing exercise with no treatment or a control intervention, the pooled SMD for the primary outcome of depression at the end of treatment was -0.62 (95% confidence interval (CI) -0.81 to -0.42), indicating a moderate clinical effect. There was moderate heterogeneity (I² = 63%).When we included only the six trials (464 participants) with adequate allocation concealment, intention-to-treat analysis and blinded outcome assessment, the pooled SMD for this outcome was not statistically significant (-0.18, 95% CI -0.47 to 0.11). Pooled data from the eight trials (377 participants) providing long-term follow-up data on mood found a small effect in favour of exercise (SMD -0.33, 95% CI -0.63 to -0.03).Twenty-nine trials reported acceptability of treatment, three trials reported quality of life, none reported cost, and six reported adverse events.For acceptability of treatment (assessed by number of drop-outs during the intervention), the risk ratio was 1.00 (95% CI 0.97 to 1.04).Seven trials compared exercise with psychological therapy (189 participants), and found no significant difference (SMD -0.03, 95% CI -0.32 to 0.26). Four trials (n = 300) compared exercise with pharmacological treatment and found no significant difference (SMD -0.11, -0.34, 0.12). One trial (n = 18) reported that exercise was more effective than bright light therapy (MD -6.40, 95% CI -10.20 to -2.60).For each trial that was included, two authors independently assessed for sources of bias in accordance with the Cochrane Collaboration 'Risk of bias' tool. In exercise trials, there are inherent difficulties in blinding both those receiving the intervention and those delivering the intervention. Many trials used participant self-report rating scales as a method for post-intervention analysis, which also has the potential to bias findings.

Authors' conclusions: Exercise is moderately more effective than a control intervention for reducing symptoms of depression, but analysis of methodologically robust trials only shows a smaller effect in favour of exercise. When compared to psychological or pharmacological therapies, exercise appears to be no more effective, though this conclusion is based on a few small trials.

PubMed Disclaimer

Conflict of interest statement

Marion McMurdo is co‐director of D.D. Developments, a University of Dundee not‐for‐profit organisation which provides exercise classes for older people.

Gillian E Mead developed a course on exercise after stroke which is licensed to Later Life Training. She receives royalty payments from Later Life Training, which are paid into an account at University of Edinburgh to support further research. She personally receives royalties from a book about Exercise and Fitness Training after Stroke. She receives expenses for speaking at conferences on exercise and fatigue after stroke.

Kerry Dwan: none known.

Carolyn A Greig: none known.

Debbie A Lawlor: none known.

Gary Cooney: None known

Jane Rimer: none known.

Fiona Waugh: none known.

Figures

1
1
Study flow diagram, showing the results of the searches for this current update.
2
2
'Risk of bias' graph: review authors' judgements about each risk of bias item presented as percentages across all included studies.
3
3
'Risk of bias' summary: review authors' judgements about each risk of bias item for each included study.
4
4
Funnel plot of comparison: 1 Exercise versus control, outcome: 1.1 Reduction in depression symptoms post‐treatment.
1.1
1.1. Analysis
Comparison 1 Exercise versus 'control', Outcome 1 Reduction in depression symptoms post‐treatment.
1.2
1.2. Analysis
Comparison 1 Exercise versus 'control', Outcome 2 Reduction in depression symptoms follow‐up.
1.3
1.3. Analysis
Comparison 1 Exercise versus 'control', Outcome 3 Completed intervention or control.
1.4
1.4. Analysis
Comparison 1 Exercise versus 'control', Outcome 4 Quality of life.
2.1
2.1. Analysis
Comparison 2 Exercise versus psychological therapies, Outcome 1 Reduction in depression symptoms post‐treatment.
2.2
2.2. Analysis
Comparison 2 Exercise versus psychological therapies, Outcome 2 Completed exercise or pyschological therapies.
2.3
2.3. Analysis
Comparison 2 Exercise versus psychological therapies, Outcome 3 Quality of life.
3.1
3.1. Analysis
Comparison 3 Exercise versus bright light therapy, Outcome 1 Reduction in depression symptoms post‐treatment.
4.1
4.1. Analysis
Comparison 4 Exercise versus pharmacological treatments, Outcome 1 Reduction in depression symptoms post‐treatment.
4.2
4.2. Analysis
Comparison 4 Exercise versus pharmacological treatments, Outcome 2 Completed exercise or antidepressants.
4.3
4.3. Analysis
Comparison 4 Exercise versus pharmacological treatments, Outcome 3 Quality of Life.
5.1
5.1. Analysis
Comparison 5 Reduction in depression symptoms post‐treatment: Subgroup analyses, Outcome 1 Exercise vs control subgroup analysis: type of exercise.
5.2
5.2. Analysis
Comparison 5 Reduction in depression symptoms post‐treatment: Subgroup analyses, Outcome 2 Exercise vs control subroup analysis: intensity.
5.3
5.3. Analysis
Comparison 5 Reduction in depression symptoms post‐treatment: Subgroup analyses, Outcome 3 Exercise vs control subroup analysis: number of sessions.
5.4
5.4. Analysis
Comparison 5 Reduction in depression symptoms post‐treatment: Subgroup analyses, Outcome 4 Exercise vs control subroup analysis: diagnosis of depression.
5.5
5.5. Analysis
Comparison 5 Reduction in depression symptoms post‐treatment: Subgroup analyses, Outcome 5 Exercise vs control subgroup analysis: type of control.
6.1
6.1. Analysis
Comparison 6 Exercise versus control: sensitivity analyses, Outcome 1 Reduction in depression symptoms post‐treatment: peer‐reviewed journal publications and doctoral theses only.
6.2
6.2. Analysis
Comparison 6 Exercise versus control: sensitivity analyses, Outcome 2 Reduction in depression symptoms post‐treatment: studies published as abstracts or conference proceedings only.
6.3
6.3. Analysis
Comparison 6 Exercise versus control: sensitivity analyses, Outcome 3 Reduction in depression symptoms post‐treatment: studies with adequate allocation concealment.
6.4
6.4. Analysis
Comparison 6 Exercise versus control: sensitivity analyses, Outcome 4 Reduction in depression symptoms post‐treatment: studies using intention‐to‐treat analysis.
6.5
6.5. Analysis
Comparison 6 Exercise versus control: sensitivity analyses, Outcome 5 Reduction in depression symptoms post‐treatment: studies with blinded outcome assessment.
6.6
6.6. Analysis
Comparison 6 Exercise versus control: sensitivity analyses, Outcome 6 Reduction in depression symptoms post‐treatment: allocation concealment, intention‐to‐treat, blinded outcome.
6.7
6.7. Analysis
Comparison 6 Exercise versus control: sensitivity analyses, Outcome 7 Reduction in depression symptoms post‐treatment: Lowest dose of exercise.

Update of

Comment in

  • Exercise for depression.
    Cooney G, Dwan K, Mead G. Cooney G, et al. JAMA. 2014 Jun 18;311(23):2432-3. doi: 10.1001/jama.2014.4930. JAMA. 2014. PMID: 24938566

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References to studies awaiting assessment

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References to ongoing studies

ACTRN12605000475640 {published data only}
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NCT00931814 {published data only}
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NCT01024790 {published data only}
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NCT01383811 {published data only}
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NCT01401569 {published data only}
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NCT01464463 {published data only}
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NCT01573130 {published data only}
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NCT01573728 {published data only}
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NCT01619930 {published data only}
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NCT01696201 {published data only}
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NCT01763983 {published data only}
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NCT01787201 {published data only}
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NCT01805479 {published data only}
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Publication types