HRV measurement is done from the mobile app, with a Bluetooth heart rate strap. A failed measurement almost always comes from one of the points below: go through them in order before starting.
1. Before starting the measurement
On your phone
Bluetooth is turned on (Android and iOS).
Location is turned on (Android only).
The Nolio app is up to date.
On your strap
It is switched on and working.
It has battery left.
It is properly positioned, with moistened electrodes.
It supports Bluetooth.
In the app
Connect to the strap. The app shows when the connection is established.
On the measurement screen, check that the HR and RR values are displayed live.
Start the measurement.
💡 Tip
Turn the sound on: you'll be notified of the measurement's progress without having to look at the screen.
2. Troubleshooting
Symptom | What to check |
The strap doesn't appear in nearby devices | That it works and is properly positioned. Above all: that it isn't already connected to another device (watch, another app). The number of simultaneous connections is limited. |
HR and RR stay at 0 | Fully close the app, then reopen it. Disconnect and reconnect the strap. |
Measurement stopped due to poor signal quality | That the strap works, and above all that the electrodes are moistened: this is the most common cause. |
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