A decade ago, a heart-rate spike at 2 a.m. would have gone unnoticed until a patient's next check-up, if it was noticed at all. Today, that same spike can trigger an alert on a smartwatch, get flagged by an algorithm trained on millions of similar events, and land in a cardiologist's dashboard before the patient even wakes up. This shift, from episodic, clinic-bound measurement to continuous, real-world data streams, is the essence of the digital biomarker revolution, and wearable devices are its primary engine.
Digital biomarkers are objective, quantifiable physiological and behavioral measurements collected through digital devices such as wearables, smartphones, ...
