Resonance frequency versus fixed 0.1 Hz breathing in HRV biofeedback: a four-week randomized comparison

Area of Science:

• Psychophysiology
• Clinical Psychology
• Behavioral Medicine

Background:

• Heart rate variability biofeedback (HRVB) is explored as an adjunctive therapy for psychological distress.
• Standard HRVB protocols often involve individualized resonance frequency (RF) training.
• The comparative effectiveness of RF training versus fixed-rate breathing (0.1 Hz) remains unclear.

Purpose of the Study:

• To compare the efficacy of HRVB using individually determined resonance frequency (RF) versus a fixed breathing rate of 0.1 Hz.
• To evaluate the impact of these HRVB protocols on perceived stress, anxiety, and depressive symptoms.
• To assess changes in resting heart rate variability (HRV) following the intervention.

Main Methods:

• A randomized controlled trial involving 88 participants.
• Three groups: individualized RF biofeedback, fixed 0.1 Hz breathing biofeedback, and a control group.
• Four-week intervention with pre- and post-intervention psychological and HRV assessments.

Main Results:

• Both HRVB groups demonstrated significant reductions in stress, anxiety, and depressive symptoms compared to the control group.
• No statistically significant differences in symptom reduction were observed between the RF and 0.1 Hz HRVB groups.
• The intervention did not yield significant changes in resting HRV across any group.

Conclusions:

• HRVB, regardless of whether using individualized RF or a fixed 0.1 Hz rate, appears effective in reducing psychological symptoms.
• Current evidence does not support a significant advantage of RF-guided breathing over fixed-rate breathing for symptom reduction.
• Larger sample sizes are recommended for future studies to detect potential subtle differences between HRVB protocols.