How can I turn the Polar app's wrist-based heart rate measurement off?You can stop the Polar app from measuring your heart rate by refusing the app permission to detect your heart rate. To turn off the Polar app's sensor permission: Swipe down from the top of the home screen to access the Quick settings menu. Tap the settings icon. Tap Apps. Tap System Apps. Scroll the list to find and tap Polar. Tap Permissions. Tap Sensors to toggle between turning them on (the switch is blue) and off (the switch is gray).