Breathing Inward: A Targeted-heat Wearable Designed to Deepen the Benefits of Diaphragmatic Breathing

Paper Title

Breathing Inward: A Targeted-heat Wearable Designed to Deepen the Benefits of Diaphragmatic Breathing

Publication Info

• Topic area: Human-computer interaction (HCI) and physiological effects of wearable technology for guided breathing.
• Keywords: Targeted-heat wearable, diaphragmatic breathing, interoception, mindfulness, autonomic nervous system, heart rate variability, somaesthetic design, inward attention, relaxation, body awareness.

Background and Problem

• Problem / challenge: Existing breathing guidance technologies, such as visual or audio feedback, often direct attention outward, potentially limiting introspection and bodily awareness. No prior work has validated whether haptic or targeted-heat modalities can elicit physiological benefits associated with diaphragmatic breathing.
• Significance: Diaphragmatic breathing is widely recognized for its ability to activate the parasympathetic nervous system, reduce stress, and improve well-being. Designing technology that enhances these benefits while fostering inward attention could improve outcomes for relaxation, mindfulness, and body-focused practices.
• Motivation and related work: Prior research has explored visual, auditory, and haptic modalities for breathing guidance, with visual guidance often being effective but outwardly focused. Somaesthetic design studies suggest targeted-heat promotes inward attention and bodily awareness, but these effects have only been qualitatively assessed. This paper addresses the gap by quantitatively evaluating targeted-heat guidance's physiological and experiential benefits.

Solution

• Proposed approach: A targeted-heat wearable that provides rhythmic heat pulses on the abdomen to guide diaphragmatic breathing, designed to foster inward attention and enhance physiological and experiential outcomes.
• Novelty:
  1. First quantitative evaluation of targeted-heat guidance's effect on the autonomic nervous system using heart rate variability (HRV) and heart rate (HR) measures.
  2. Comparison of targeted-heat guidance with visual guidance to assess differences in inward attention and physiological benefits.
  3. Integration of mixed-methods evaluation, including physiological monitoring, self-report questionnaires, and qualitative interviews.
• Procedure and key techniques:
  • Development of a wearable belt with conductive thread-based heating elements, adjustable temperature, and rhythmic heat cycles.
  • Between-subjects study with 40 participants practicing paced diaphragmatic breathing guided by either targeted-heat or visual animation.
  • Physiological measures (HR, HRV, respiration), self-report questionnaires (MAIA-2, SMS), and qualitative interviews were used to assess outcomes.

Results

• Concrete findings:
  • Heat-guidance led to lower heart rate (mean log change −2.082, 94% HDI [−2.191, −1.963]) and decreased LF/HF ratio (mean −2.08, 94% HDI [−3.9, −0.23]), indicating better autonomic balance and stress reduction.
  • Self-report measures showed higher interoceptive awareness (MAIA-2 total score: heat-guidance M = 89.75, SD = 10.94; visual-guidance M = 80.15, SD = 14.40) and mindfulness (SMS: heat-guidance M = 3.99, SD = 0.39; visual-guidance M = 3.61, SD = 0.56).
• Advantage over baselines: Heat-guidance demonstrated superior physiological outcomes (HRV, HR) and experiential benefits (interoception, mindfulness) compared to visual-guidance, which showed no credible change in autonomic measures.
• Experiments / evaluation:
  • Participants (N = 40) balanced by age, gender, and prior breathing practice experience.
  • 15-minute breathing sessions paced at 5 breaths per minute, with continuous physiological monitoring and post-task questionnaires.
  • Qualitative interviews revealed heat-guidance fostered inward attention and emotional comfort, while visual-guidance was perceived as outwardly focused and rigid.
• Limitations and future work:
  • Results specific to 15-minute sessions at 5 bpm; effects of other practices or durations remain unexplored.
  • Comparison limited to visual guidance; future work should include other tactile, audio, or multimodal comparators.
  • Single-session study may reflect novelty effects; longitudinal studies needed to assess sustained impact.

Summary

This study introduces a targeted-heat wearable designed to guide diaphragmatic breathing by providing rhythmic heat pulses on the abdomen. Compared to visual guidance, the heat modality demonstrated superior physiological benefits, including reduced heart rate and improved autonomic balance, as well as enhanced interoceptive awareness and mindfulness. Qualitative findings revealed that heat guidance encouraged inward attention and emotional comfort, while visual guidance was perceived as outwardly focused and rigid. The results suggest targeted-heat feedback can deepen the benefits of breathing practices and support introspective technologies for relaxation, mindfulness, and body-focused applications.