here-and-now / HRVoscope

Exploration of heart rate variability analysis and biofeedback using HRV

Roadmap

• Read and display ECG from Polar H10 ✔️
• Calculate various HRV metrics
  • SDRR
  • SDANN ✔️
  • pNN50 ✔️
  • pNN20 ✔️
  • RMSSD ✔️
  • LF/HF
  • Poincare plot
• Live plot HRV metrics ✔️
• Implement different breathing techniques pacers
  • Box breathing ✔️
  • Right nostril breathing/left nostril breathing pranayama
  • 4/7/8 breathing
  • ...
• Spectral analysis of HRV
• Log data for different breathing techniques for further analysis
• Accelerometer data, cause why not ✔️
• Android app

Papers

Basics

• An Overview of Heart Rate Variability Metrics and Norms (2017)
• Heart Rate Variability in Psychology: A Review of HRV Indices and an Analysis Tutorial (2021

Biofeedback

• A meta-analysis on heart rate variability biofeedback and depressive symptoms (2021)
• Heart rate variability biofeedback: how and why does it work? (2014)
• Heart Rate Variability Biofeedback Improves Emotional and Physical Health and Performance: A Systematic Review and Meta Analysis (2020)

Breathing techniques

• Integrating Breathing Techniques Into Psychotherapy to Improve HRV: Which Approach Is Best? (2021)
• Immediate autonomic changes during right nostril breathing and left nostril breathing in regular yoga practitioners (2022)