Functioning Level as a Buffer: Longitudinal Associations Between Heart Rate Variability and Post-Traumatic Stress...

Area of Science:

• Psychiatry
• Cardiology
• Trauma Research

Background:

• Heart rate variability (HRV) reflects autonomic nervous system activity.
• Post-traumatic stress disorder (PTSD) is a significant public health concern following trauma.
• The relationship between HRV and PTSD development may be influenced by individual functional capacities.

Purpose of the Study:

• To investigate how functional levels modify the association between HRV components (LF and HF) and PTSD development.
• To determine if HRV-PTSD associations differ based on social and occupational functioning.
• To identify potential protective factors in PTSD risk.

Main Methods:

• Longitudinal study of 538 physically injured patients over 2 years.
• Assessed baseline HRV (LF, HF), functional levels (Social and Occupational Functioning Scale), and covariates.
• Diagnosed PTSD using the Clinician-Administered PTSD Scale for DSM-5 at multiple time points.
• Employed logistic regression to analyze associations and interaction effects.

Main Results:

• A significant interaction effect between LF/HF ratio and functioning level on PTSD development was observed.
• Lower LF/HF ratios were associated with increased PTSD risk only in participants with lower functioning levels.
• Higher functioning levels appeared to mitigate the association between low LF/HF and PTSD.

Conclusions:

• Functional level significantly modifies the relationship between HRV components and PTSD development.
• Higher social and occupational functioning may act as a buffer against PTSD.
• Assessing functional status is crucial for PTSD risk stratification, and interventions targeting functioning may reduce PTSD risk.