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The second sound, caused by the closure of the aortic and pulmonary valves, preventing backflow into the ventricles.

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Recent landmark research published in Nature Communications reveals that our ability to perceive our own heartbeat is causally linked to frontal brain activity. Specifically, lower-frequency electrical waves in the brain, known as , act as an internal volume knob. When researchers artificially enhanced these delta waves using non-invasive brain stimulation, individuals became worse at tracking their own heartbeats. Suppressing the waves made participants noticeably more accurate. The second sound, caused by the closure of

Elevation or depression is a critical indicator of myocardial ischemia or injury. Repolarization and electrical resetting of the ventricles. Elevation or depression is a critical indicator of

The primary spike used to calculate instantaneous heart rate.

With continuous health monitoring comes the responsibility of absolute data security. Heartbeat 1 operates on a decentralized, end-to-end encrypted architecture. Health metrics are processed locally on the user's device using edge computing, ensuring that sensitive medical data remains entirely private and under the user's explicit control.