The Effects of Aerobic and Resistance Exercise on Depression and Anxiety: Systematic Review With Meta-Analysis.

Exercise can reduce physiological and psychological symptoms associated with depression and anxiety. However, it is unknown which mode of exercise, if any, is more beneficial. To determine whether aerobic, resistance, or aerobic and resistance exercise improves depressive and/or anxiety symptoms in individuals diagnosed with depression or anxiety. Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed. Five electronic databases were searched, until February 24, 2024. Studies were included for analysis based on satisfying quality appraisal standards and the established inclusion criteria associated with aerobic or resistance exercise in adults with a diagnosis of depression or anxiety. Random effects meta-analysis was performed where possible. Thirty-two randomised controlled trial studies (n = 3243 participants) met the inclusion criteria for this systematic review, and 26 studies (n = 2681 participants) were included in the meta-analyses. For the 25 studies assessing the effect of exercise on depressive symptoms, the pooled standardised mean difference (SMD) favoured exercise as a beneficial treatment of depression (-0.97, 95% confidence interval [CI] -1.28 to -0.66), with a large magnitude of effect. For the 11 studies reporting the effect of exercise on anxiety symptoms, the pooled SMD results revealed that exercise had a significant, moderate magnitude of effect favouring exercise treatment (-0.66, 95% CI -1.09 to -0.23). No studies excessively influenced the outcomes of depression and anxiety. Aerobic, resistance, or a mixture of aerobic and resistance exercise is beneficial for improving symptoms of depression and anxiety. Protocol Registration: PROSPERO registration number: CRD42019119341 (date of registration: 5/2/2019).