A Garmin app that measures HRV(Heart Rate Variability) in a 3 minute test. Saves the output as a Connect IQ activity.

Link to the Garmin Connect IQ app store.

• HRV (Heart Rate Variability)
  • RMSSD - Root Mean Square of Successive Differences (beat-to-beat intervals)
  • pNN20 - % of successive beat-to-beat intervals that differ by more than 20 ms
  • pNN50 - % of successive beat-to-beat intervals that differ by more than 50 ms
  • beat-to-beat interval - reading coming directly from the watch sensor
  • HRV Successive Differences - difference between current and previous beat-to-beat intervals
  • SDRR - Standard Deviation of beat-to-beat intervals
  • HRV RMSSD 30 Sec Window - RMSSD calculated for consecutive 30 second intervals
  • HR from heartbeat - beat-to-beat interval converted to HR
• HR (Heart Rate)
  • minimum
  • average
  • maximum

Results are saved as a Garmin Connect activity category Other named Test HRV:

The summary data is saved under Stats, section Connect IQ:

The extra graphs are shown next to the built-in Garmin graphs:

• Connect IQ 3+ compatible device that tracks Heart Beat Interval data
• Measurements taken from the built-in optical HR sensor on the watch
  • For reliable readings minimise wrist movement
  • No strap required
• HR straps not supported
• The app starts measurements automatically as soon as stable sensor readings are detected

• Status Icons - Font Awesome free (SIL OFL 1.1 License)