The efficacy of exercise in reducing depressive symptoms among cancer survivors: a meta-analysis

Justin C Brown, Tania B Huedo-Medina, Linda S Pescatello, Stacey M Ryan, Shannon M Pescatello, Emily Moker, Jessica M LaCroix, Rebecca A Ferrer, Blair T Johnson, Justin C Brown, Tania B Huedo-Medina, Linda S Pescatello, Stacey M Ryan, Shannon M Pescatello, Emily Moker, Jessica M LaCroix, Rebecca A Ferrer, Blair T Johnson

Abstract

Introduction: The purpose of this meta-analysis was to examine the efficacy of exercise to reduce depressive symptoms among cancer survivors. In addition, we examined the extent to which exercise dose and clinical characteristics of cancer survivors influence the relationship between exercise and reductions in depressive symptoms.

Methods: We conducted a systematic search identifying randomized controlled trials of exercise interventions among adult cancer survivors, examining depressive symptoms as an outcome. We calculated effect sizes for each study and performed weighted multiple regression moderator analysis.

Results: We identified 40 exercise interventions including 2,929 cancer survivors. Diverse groups of cancer survivors were examined in seven exercise interventions; breast cancer survivors were examined in 26; prostate cancer, leukemia, and lymphoma were examined in two; and colorectal cancer in one. Cancer survivors who completed an exercise intervention reduced depression more than controls, d(+) = -0.13 (95% CI: -0.26, -0.01). Increases in weekly volume of aerobic exercise reduced depressive symptoms in dose-response fashion (β = -0.24, p = 0.03), a pattern evident only in higher quality trials. Exercise reduced depressive symptoms most when exercise sessions were supervised (β = -0.26, p = 0.01) and when cancer survivors were between 47-62 yr (β = 0.27, p = 0.01).

Conclusion: Exercise training provides a small overall reduction in depressive symptoms among cancer survivors but one that increased in dose-response fashion with weekly volume of aerobic exercise in high quality trials. Depressive symptoms were reduced to the greatest degree among breast cancer survivors, among cancer survivors aged between 47-62 yr, or when exercise sessions were supervised.

Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1. Flow diagram of exercise intervention…
Figure 1. Flow diagram of exercise intervention identification and selection.
Figure 2. Forest plot of depressive symptom…
Figure 2. Forest plot of depressive symptom reduction by cancer group.

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