Author:

Keywords:

Science & Technology, Life Sciences & Biomedicine, Clinical Neurology, Psychiatry, Neurosciences & Neurology, Depression, Mobile health (mHealth), Real-world monitoring, Night resting heart rate, Anxiety, Sleep disturbance, RATE-VARIABILITY, ANXIOUS DEPRESSION, PREVALENCE, METAANALYSIS, INSOMNIA, DISEASE, STRESS, HYPERSOMNIA, RELIABILITY, DISTURBANCE, Humans, Depressive Disorder, Major, Male, Female, Heart Rate, Adult, Middle Aged, Severity of Illness Index, Sleep Wake Disorders, Longitudinal Studies, Recurrence, RADAR-CNS consortium. Electronic address: https://radar-cns.org/, 11 Medical and Health Sciences, 17 Psychology and Cognitive Sciences, 32 Biomedical and clinical sciences, 42 Health sciences, 52 Psychology

Abstract:

BACKGROUND: Elevated night resting heart rate (HR) has been associated with increased depression severity, yet the underlying mechanisms remain elusive. This study aimed to investigate the mediating role of sleep disturbance and the influence of anxiety on the relationship between night resting HR and depression severity. METHODS: This is a secondary data analysis of data collected in the Remote Assessment of Disease and Relapse (RADAR) Major Depressive Disorder (MDD) longitudinal mobile health study, encompassing 461 participants (1774 observations) across three national centers (Netherlands, Spain, and the UK). Depression severity, anxiety, and sleep disturbance were assessed every three months. Night resting HR parameters in the 2 weeks preceding assessments were measured using a wrist-worn Fitbit device. Linear mixed models and causal mediation analysis were employed to examine the impact of sleep disturbance and anxiety on night resting HR on depression severity. Covariates included age, sex, BMI, smoking, alcohol consumption, antidepressant use, and comorbidities with other medical conditions. RESULTS: Higher night resting HR was linked to subsequent depressive severity, through the mediation of sleep disturbance. Anxiety contributed to an exacerbated level of sleep disturbance, subsequently intensifying depression severity. Anxiety exhibited no direct effect on night resting HR. CONCLUSIONS: Our findings underscore the mediating role of sleep disturbance in the effect of night resting HR on depression severity, and anxiety on depression severity. This insight has potential implications for early identification of indicators signalling worsening depression symptoms, enabling clinicians to initiate timely and responsive treatment measures.