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Cardiorespiratory fitness and response to exercise treatment in depression.


ABSTRACT: Background:Exercise improves cardiorespiratory fitness (CRF) and reduces depressive symptoms in people with depression. It is unclear if changes in CRF are a predictor of the antidepressant effect of exercise in people with depression. Aims:To investigate whether an increase in CRF is a predictor of depression severity reduction after 12 weeks of exercise (trial registration: DRKS study ID, DRKS00008745). Method:The present study includes participants who took part in vigorous (n = 33), moderate (n = 38) and light (n = 39) intensity exercise and had CRF information (as predicted maximal oxygen uptake, V?O2max) collected before and after the intervention. Depression severity was measured with the Montgomery-Åsberg Depression Rating Scale (MADRS). V?O2max (L/min) was assessed with the Åstrand-Rhyming submaximal cycle ergometry test. The main analysis was conducted pooling all exercise intensity groups together. Results:All exercise intensities improved V?O2max in people with depression. Regardless of frequency and intensity of exercise, an increase in post-treatment V?O2max was significantly associated with reduced depression severity at follow-up (B = -3.52, 95% CI -6.08 to -0.96); adjusting for intensity of exercise, age and body mass index made the association stronger (B = -3.89, 95% CI -6.53 to -1.26). Similarly, increased V?O2max was associated with higher odds (odds ratio = 3.73, 95% CI 1.22-11.43) of exercise treatment response (?50% reduction in MADRS score) at follow-up. Conclusions:Our data suggest that improvements in V?O2max predict a greater reduction in depression severity among individuals who were clinically depressed. This finding indicates that improvements in V?O2max may be a marker for the underpinning biological pathways for the antidepressant effect of exercise. Declaration of interest:None.

SUBMITTER: Rahman MS 

PROVIDER: S-EPMC6094184 | BioStudies | 2018-01-01

REPOSITORIES: biostudies

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