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Autonomic Function Following Concussion in Youth Athletes: An Exploration of Heart Rate Variability Using 24-hour Recording Methodology
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Depression and heart rate variability in firefighters.

Li-Mei Liao1, Salah S Al-Zaiti2, Mary G Carey3

  • 1School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China.

SAGE Open Medicine
|January 16, 2016
PubMed
Summary

Depression in firefighters is linked to reduced heart rate variability, indicating decreased vagal tone. This suggests a potential mechanism connecting depression and sudden cardiac death risk in this high-risk group.

Keywords:
Depressionfirefightersheart rate variability

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Area of Science:

  • Cardiology
  • Occupational Health
  • Psychiatry

Background:

  • Depression elevates mortality risk in coronary artery disease patients.
  • This risk is mediated by altered cardiac autonomic tone and heart rate variability (HRV).
  • Firefighters face high risks for depression and sudden cardiac death.

Purpose of the Study:

  • Investigate the link between depression and cardiac autonomic tone in firefighters.
  • Determine if HRV alterations explain the increased sudden cardiac death risk in depressed firefighters.

Main Methods:

  • 107 firefighters completed the Beck Depression Inventory.
  • 24-hour ambulatory electrocardiographic monitoring assessed HRV.
  • Statistical analyses controlled for hypertension, age, and BMI.

Main Results:

  • Depressed firefighters exhibited significantly lower HRV indices.
  • Key HRV measures (RMSSD, SDNN, pNN50) were reduced in the depressed group.
  • These differences persisted after controlling for confounding factors.

Conclusions:

  • Reduced vagal tone is a probable mechanism linking depression to sudden cardiac death in firefighters.
  • HRV alterations may underlie the increased cardiac risk associated with depression in this population.