Heart rate variability and suicidal behavior.

Area of Science:

• Psychophysiology
• Clinical Psychology
• Neuroscience

Background:

• Biomarker-based models offer advantages for identifying suicide risk.
• Decreased high frequency heart rate variability (HF HRV) is a potential biomarker for suicide risk.

Purpose of the Study:

• To determine if HF HRV differs between individuals with and without a history of suicide attempts.
• To explore the association between self-reported anger and HF HRV as a potential mechanism linking stress response to suicide risk.

Main Methods:

• Comparison of HF HRV during the Trier Social Stress Test (TSST) in females with and without a history of suicide attempt.
• Analysis of the relationship between self-reported anger and HF HRV before and during TSST.

Main Results:

• Suicide attempters exhibited lower cumulative HF HRV during the TSST compared to non-attempters.
• Attempters showed a greater increase in self-reported anger during the TSST, which was negatively associated with HF HRV.

Conclusions:

• Suicide attempters demonstrate a diminished capacity to regulate their physiological and emotional responses to stress.
• Impaired anger regulation may mediate the link between reduced HF HRV and elevated suicide risk, suggesting potential targets for intervention.