Methodology

Technique Recommendations

Vayu recommends breathing techniques based on your stated goal (sleep, focus, calm, energy), time of day, session history, and real-time heart rate data from your smartwatch.

The recommendation engine uses a rule-based system informed by published breathwork research. For example, extended-exhale patterns (4-7-8, physiological sigh) are prioritized for evening/sleep goals, while balanced patterns (box breathing) are suggested for focus.

Metrics We Track

• Session Duration: Total time spent in guided breathing. Measured from first inhale cue to session end.
• Heart Rate (BPM): Real-time heart rate from Apple Watch or Wear OS optical sensor. Sampled continuously during sessions.
• Practice Streak: Consecutive calendar days with at least one completed session. Resets on a missed day.
• Technique Adherence: Whether the user follows the prescribed inhale/hold/exhale timing within a tolerance window.

Personalization

Vayu adapts over time. As you complete more sessions, the app learns which techniques produce the greatest heart rate reduction for you personally, and adjusts future recommendations accordingly.

All personalization is on-device. No breathing data leaves your phone/watch without explicit consent.

Limitations

• Vayu is a wellness tool, not a medical device. It does not diagnose, treat, or prevent any disease.
• Heart rate accuracy depends on smartwatch sensor quality and wrist fit.
• Breathing technique efficacy varies by individual; published research shows population-level benefits but individual results differ.
• Streak and adherence metrics are self-reported via app usage, not clinically verified.