Baseline Depressive Symptoms and Heart Rate Variability Indices Predict HRV Biofeedback Outcomes in Young Adults with...

Area of Science:

• Psychiatry and Psychology
• Cardiology
• Neuroscience

Background:

• Heart rate variability biofeedback (HRVB) is known to improve cardiovagal activation and reduce depressive symptoms in major depressive disorder (MDD).
• Predictors of treatment success for HRVB in MDD remain unclear, particularly concerning specific dimensions of depression.
• Understanding these predictors is crucial for tailoring HRVB interventions for better patient outcomes.

Purpose of the Study:

• To investigate which dimensions of depression predict treatment outcomes in patients with MDD undergoing HRVB.
• To examine the effects of HRVB on psychological variables and heart rate variability (HRV) indices.
• To compare HRVB with relaxation training (RT) in treating depressive and anxiety symptoms.

Main Methods:

• A randomized controlled trial involving 59 patients with depressive disorder, assigned to HRVB or RT groups.
• Intervention consisted of 10 sessions over five weeks, with psychological assessments and ECG recordings pre- and post-treatment.
• HRV indices were derived from ECG data; responders and non-responders within the HRVB group were identified based on RMSSD changes.

Main Results:

• Both HRVB and RT groups showed significant reductions in depression and anxiety over time, with no significant inter-group differences.
• The HRVB group exhibited significant increases in HRV indices from pre-test to post-test transfer stage.
• HRVB responders had lower baseline depressive symptoms (e.g., anhedonia, worthlessness, fatigue) and lower parasympathetic activity than non-responders.

Conclusions:

• HRVB effectively alleviates depression and anxiety symptoms while enhancing autonomic nervous system activity in patients with depressive disorders.
• Patients with more favorable psychological profiles and lower parasympathetic activity at baseline tend to benefit most from HRVB.
• These findings support the development of personalized, evidence-based psychological interventions for MDD, leveraging HRVB.