State-related differences in heart rate variability in bipolar disorder
Research output: Contribution to journal › Letter › Research › peer-review
Maria Faurholt-Jepsen, Søren Brage, Lars Vedel Kessing, Klaus Munkholm
Heart rate variability (HRV) is a validated measure of sympato-vagal balance in the autonomic nervous system. HRV appears decreased in patients with bipolar disorder (BD) compared with healthy individuals, but the extent of state-related alterations has been sparingly investigated. The present study examined differences in HRV between affective states in BD. A heart rate and movement sensor weighing 8 g collected average acceleration, heart rate and the two slowest and fastest heart beats (of the most recent 16 beats) every 30 s over a period of at least three consecutive weekdays and nights in a prospective longitudinal design from a total of 31 different affective states in 16 outpatients with BD. A proxy measure of HRV was calculated as the difference between the second-shortest and the second-longest inter-beat-interval collected during each of the epochs. Analyses were based on over 100.000 HRV data-points. In unadjusted analyses and in analyses adjusted for age, gender and heart rate, during a manic state HRV was increased by 18% compared with a depressed state (eB = 1.18, 95% CI: 1.16-1.20, p < 0.001) and increased by 17% compared with a euthymic state (eB = 1.17, 95% CI: 1.15-1.19, p < 0.001), whereas there was no difference between a depressive state and a euthymic state (eB = 0.98, 95% CI: 0.96-1.00, p = 0.12). Further inclusion of BMI as a covariate did not alter any of the associations. HRV appears to be altered in a state-dependent manner in bipolar disorder and could represent a candidate state marker. Further studies with larger sample sizes are warranted.
|Journal||Journal of Psychiatric Research|
|Number of pages||5|
|Publication status||Published - Jan 2017|
- Actigraphy, Adult, Affect/physiology, Age Factors, Bipolar Disorder/drug therapy, Female, Heart Rate/physiology, Humans, Longitudinal Studies, Male, Models, Statistical, Monitoring, Ambulatory, Motor Activity/physiology, Outpatients, Prospective Studies, Psychiatric Status Rating Scales, Sex Factors