Dhruv Adhia

Vayu: Screen-Free Haptic Breathwork with HRV-Adaptive Control—Pilot Outcomes and System Design

medRxiv June 24, 2026 Dhruv Adhia, Deepali Raithatha, Arron Ferguson et al. preprint

Abstract Vayu is a mobile breathwork system comprising an iOS companion app and Apple Watch application that delivers slow, resonant breathing using screen-free haptic cues , HRV-adaptive pacing, and reflective journaling grounded in Patanjali’s five states of mind. The watchOS component provides tactile phase guidance and real-time biometric sensing (heart rate, HRV), while the iOS interface...