Respiratory sinus arrhythmia as a within-session biomarker in depression psychotherapy: integrating resting RSA and...

Area of Science:

• Psychophysiology
• Clinical Psychology
• Psychotherapy Research

Background:

• Affective regulation is crucial in depression treatment, but within-session markers are limited.
• Respiratory Sinus Arrhythmia (RSA), a measure of parasympathetic nervous system activity, is linked to emotional regulation.
• Identifying physiological biomarkers within therapy sessions can enhance treatment understanding.

Purpose of the Study:

• To determine if resting RSA can serve as a biomarker for depression severity.
• To investigate if RSA reactivity and its interaction with resting RSA can indicate within-session therapeutic progress.
• To explore the relationship between RSA dynamics and session quality in psychotherapy.

Main Methods:

• A nonrandomized observational study involving 28 clients with Major Depressive Disorder (MDD).
• Supportive-Expressive short-term psychodynamic therapy was utilized.
• Resting RSA and RSA reactivity were measured across five sessions, with session quality assessed via the Session Evaluation Scale.

Main Results:

• Higher resting RSA correlated with lower pre-session depression severity at the within-client level.
• The interaction between resting RSA and RSA reactivity predicted session quality.
• Greater resting RSA amplified the positive association between RSA reactivity and perceived session quality.

Conclusions:

• Resting RSA shows potential as a biomarker for depression severity.
• RSA dynamics during therapy sessions can serve as a valuable within-session biomarker.
• Physiological measures like RSA offer insights into affective regulation processes during psychotherapy.