Abstract:
BACKGROUND:Physical exercise has well-characterized positive effects on depressive symptoms. The underlying biologic mechanisms are, however, far from established. A recently discovered mechanism has linked the enhanced conversion of kynurenine to kynurenic acid (KYNA) to an increased resilience toward stress-induced depression in mice. The aim of this study was to translate these findings to humans. MATERIALS AND METHODS:Kynurenine and KYNA levels were measured by high-performance liquid chromatography in plasma samples from 117 patients affected by mild-to-moderate depression before and within a week after a 12-week training period at three different intensities. The patients were part of the Regassa study. RESULTS:No differences in plasma levels of kynurenine and KYNA or in their ratio could be detected between before and after training. No effect of the intensity group could be observed. No correlation with the improvement in cardiovascular fitness (Åstrand score) or the improvement in mood (Montgomery Åsberg Depression Rating Scale score) could be observed. LIMITATIONS:As the Regassa study is based on an intention-to-treat protocol, the exact time and the exact intensity of the physical exercise are not known. Analyses of pulse data as well as personal interviews, however, were used to control the exercise protocols. Furthermore, the observations reflect chronic changes. CONCLUSION:Physical exercise positively affects mood and cardiovascular fitness, but does not lead to long-lasting changes in plasma levels of kynurenine and KYNA in patients affected by mild-to-moderate depression.
journal_name
Neuropsychiatr Dis Treatjournal_title
Neuropsychiatric disease and treatmentauthors
Millischer V,Erhardt S,Ekblom Ö,Forsell Y,Lavebratt Cdoi
10.2147/NDT.S131746subject
Has Abstractpub_date
2017-03-31 00:00:00pages
967-972eissn
1176-6328issn
1178-2021pii
ndt-13-967journal_volume
13pub_type
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