Heart Вђ“ Mr Validity May 2026

3. The "Mr. Validity" Challenge: Smartphones vs. Gold Standards

Scientific validity requires comparing new technology against the established "gold standard": the . Heart – Mr Validity

It is the variation in time between consecutive heartbeats (R–R intervals), serving as a window into the autonomic nervous system. Heart – Mr Validity

Validity of Smartphone Heart Rate Variability Pre - PMC - NIH Heart – Mr Validity