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J Psychiatr Res. 2018 Aug;103:156-160. doi: 10.1016/j.jpsychires.2018.05.022. Epub 2018 May 25.

Prospective study of chronotype and incident depression among middle- and older-aged women in the Nurses' Health Study II.

Author information

1
Department of Integrative Physiology, University of Colorado, 1725 Pleasant Street Ramaley N368, 354 UCB, Boulder, CO 80309-0354, USA; Broad Institute of MIT and Harvard, Program of Medical and Population Genetics, 415 Main Street, Cambridge, MA 02142, USA; Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School, 181 Longwood Avenue, Boston, MA 02115, USA. Electronic address: celine.vetter@colorado.edu.
2
Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School, 181 Longwood Avenue, Boston, MA 02115, USA.
3
Department of Epidemiology, Center for Public Health, Medial University of Vienna, Kinderspitalgasse 15/ 1. Stock, 1090, Vienna, Austria.
4
Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School, 181 Longwood Avenue, Boston, MA 02115, USA; Department of Psychiatry, Massachusetts General Hospital, and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA; Department of Epidemiology, Harvard T.H. Chan School of Public Health, 677 Huntington Avenue, Boston, MA 02115, USA.
5
Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School, 181 Longwood Avenue, Boston, MA 02115, USA; Department of Epidemiology, Center for Public Health, Medial University of Vienna, Kinderspitalgasse 15/ 1. Stock, 1090, Vienna, Austria; Department of Epidemiology, Harvard T.H. Chan School of Public Health, 677 Huntington Avenue, Boston, MA 02115, USA.

Abstract

BACKGROUND:

Prior cross-sectional studies have suggested that being a late chronotype is associated with depression and depressive symptoms, but prospective data are lacking.

METHODS:

We examined the association between chronotype and incident depression (defined as self-reported physician/clinician-diagnosed depression or antidepressant medication use) in 32,470 female participants of the Nurses' Health Study II cohort who self-reported their chronotype (early, intermediate or late) and were free of depression at baseline in 2009 (average age: 55 yrs). Women updated their depression status on biennial questionnaires in 2011 and 2013. We used multivariable (MV)-adjusted Cox proportional hazards models to estimate hazard ratios (HR) and 95% confidence intervals (95%CI) for incident depression across chronotype categories (i.e., early, intermediate, and late chronotypes).

RESULTS:

Across a follow-up period of 4 years, we observed 2,581 cases of incident depression in this cohort. Compared to intermediate chronotypes, early chronotypes had a modestly lower risk of depression after MV adjustment (MVHR = 0.88, 95%CI = 0.81-0.96), whereas late chronotypes had a similar risk of 1.06 (95%CI = 0.93-1.20); the overall trend across chronotype categories was statistically significant (ptrend<0.01). Results were similar when we restricted analyses to women who reported average sleep durations (7-8 h/day) and no history of rotating night shift work at baseline.

CONCLUSIONS:

Our results suggest that chronotype may influence the risk of depression in middle-to older-aged women. Additional studies are needed to confirm these findings and examine roles of both environmental and genetic factors to further our understanding of the role of chronotype in the etiology of mood disorders.

KEYWORDS:

Circadian rhythms; Mental health; Mood; Morningness-eveningness; Shift work; Sleep

PMID:
29860110
PMCID:
PMC6016366
[Available on 2019-08-01]
DOI:
10.1016/j.jpsychires.2018.05.022

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