Abstract
Background
We examined associations between dog ownership, morning dog walking and its timing and duration, and depression risk in female nurses, exploring effect modification by chronotype. We hypothesized that dog ownership and morning walking with the dog are associated with lower odds of depression, and that the latter is particularly beneficial for evening chronotypes by helping them to synchronize their biological clock with the solar system.
Methods
26,169 depression-free US women aged 53–72 from the Nurses’ Health Study 2 (NHS2) were prospectively followed from 2017–2019. We used age- and multivariable-adjusted logistic regression models to estimate odds ratios (ORs) and 95% confidence intervals (95%CIs) for depression according to dog ownership, and morning dog walking, duration, and timing.
Results
Overall, there was no association between owning a dog (ORvs_no_pets = 1.12, 95%CI = 0.91–1.37), morning dog walking (ORvs_not = 0.87, 95%CI = 0.64–1.18), or the duration (OR>30min vs. ≤15mins = 0.68, 95%CI = 0.35–1.29) or timing of morning dog walks (ORafter9am vs. before7am = 1.06, 95%CI = 0.54–2.05) and depression. Chronotype of dog owners appeared to modify these associations. Compared to women of the same chronotype but without pets, dog owners with evening chronotypes had a significantly increased odds of depression (OR = 1.60, 95%CI = 1.12–2.29), whereas morning chronotypes did not (OR = 0.94, 95%CI = 0.71–1.23). Further, our data suggested that evening chronotypes benefited more from walking their dog themselves in the morning (OR = 0.75, 95%CI = 0.46–1.23, Pintx = 0.064;) than morning chronotypes.
Conclusions
Overall, dog ownership was not associated with depression risk though it was increased among evening chronotypes. Walking their dog in the morning might help evening chronotypes to lower their odds of depression, though more data are needed to confirm this finding.
Funder
Eunice Kennedy Shriver National Institute of Child Health and Human Development
Foundation for the National Institutes of Health
Publisher
Public Library of Science (PLoS)
Reference66 articles.
1. Prevalence of Depression Among Adults Aged 20 and Over: United States, 2013–2016.;DJ Brody;NCHS Data Brief.,2018
2. A framework for understanding how activities associated with dog ownership relate to human well-being.;AM Barcelos;Sci Rep,2020
3. Demographic and contextual factors as moderators of the relationship between pet ownership and health.;MK Mueller;Health Psychol Behav Med,2021
4. Is Dog Ownership Associated with Mental Health? A Population Study of 68,362 Adults Living in England;S Liu;Anthrozoös,2019
5. Pet Ownership and Quality of Life: A Systematic Review of the Literature.;KJ Scoresby;Vet Sci.,2021