QRS

The QRS complex represents the electrical activation of the ventricles and is the most distinct electrical event in each cardiac cycle. In heart rate monitoring, precise QRS detection gives a cleaner marker for every heartbeat than optical signals alone.

• Arrhythmia detection: High-resolution HRV can help identify irregular or ectopic beats more reliably.
• Cleaner data: ECG-level signals are especially useful during HIIT, sprinting, and contact sports.
• Field testing: Apps can combine QRS-based data with advanced HRM straps to provide ECG-style insights outside the lab.

In short, QRS detection unlocks precision-driven insights that go far beyond “just heart rate”.

Running Dynamics from Heart Rate Monitors

Modern HRM straps use built-in motion sensors to track your body’s movement with each step. Paired with a compatible activity watch, this is translated into advanced running metrics.

1. Cadence – steps per minute.
2. Vertical Oscillation – how much you bounce up and down while running.
3. Ground Contact Time – how long each foot stays on the ground.
4. Ground Contact Time Balance – left/right symmetry of ground contact.
5. Stride Length – distance covered per step.
6. Vertical Ratio – efficiency measure based on vertical oscillation and stride length.