Digital Health Wearable Heart Rate Spectral Entropy as a Surrogate Endpoint for Autonomic Recovery Post‑Concussion: Validation Pathway and Deployment Blueprint for Scalable Youth Sports Trials Yoo plus 2026-01-18 0 The promise of wearable heart rate spectral entropy as a surrogate endpoint for autonomic recovery post‑concussion is... Read More Read more about Wearable Heart Rate Spectral Entropy as a Surrogate Endpoint for Autonomic Recovery Post‑Concussion: Validation Pathway and Deployment Blueprint for Scalable Youth Sports Trials