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Influence of Affective Context on the Brain-Body Regulatory Effects of Respiratory Intervention: An EEG and HRV Analysis

  • Journal of the Korean Society of Physical Medicine
  • Abbr : J Korean Soc Phys Med
  • 2025, 20(4), pp.143~151
  • Publisher : The Korean Society of Physical Medicine
  • Research Area : Medicine and Pharmacy > Physical Therapy > Other physical therapy
  • Received : October 11, 2025
  • Accepted : October 27, 2025
  • Published : November 30, 2025

Kyung-Yoon Kim 1 Bae Seahyun 1

1동신대학교

Accredited

ABSTRACT

PURPOSE: This study investigated the differential effects of slow-paced breathing on the brain and autonomic nervous system responses under positive and negative affective contexts. The hypothesis tested was that the neurophysiological effects of respiratory intervention depend on the emotional state, specifically that the negative-affect group would show a larger increase in frontal alpha asymmetry (FAA) during the task condition than the positive group. METHODS: Twenty-one healthy young adults were assigned randomly to a positive (n = 10) or negative (n = 11) emotion group. Electroencephalography (EEG) and electrocardiography (ECG) were recorded before and after the intervention during the resting-state and task conditions. The intervention involved slow-paced breathing at six breaths/min (0.1 Hz). Frontal alpha asymmetry (FAA) and heart rate variability (HRV) were analyzed using a linear mixed-effects model. RESULTS: A significant group × time × condition interaction was observed for FAA (p < .05). The negative group showed a significant increase in FAA only during the task condition post-intervention. In contrast, HRV analysis indicated a general effect, with significant increases in HF power and decreases in the LF/HF ratio post-intervention across both groups (p < .001), reflecting enhanced parasympathetic and reduced sympathetic activity. CONCLUSION: The effects of slow-paced breathing are context-dependent. Although it universally promotes autonomic stability, its regulatory influence on cortical activity appears conditional, primarily modulating the approach-avoidance motivational system in negative affective contexts. These findings highlight the importance of context-aware, personalized breathing protocols in clinical applications.

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