heart rate app not working after ios 4 update on watch series 2

Hi

Under watchOS 4, for Apple Watch Nike+ models (and certain others), the Heart Rate app reports your resting heart rate once it has gathered sufficient data.

To view your resting rate, open the Heart Rate app and scroll down the page (by swiping or turning the Digital Crown):

Check your heart rate

Resting rate is also reported in the Health app on your iPhone (Health Data > Heart > Resting Rate:

Use the Health app on your iPhone or iPod touch - Apple Support

If your heart rate is not being recorded as expected, then the following steps may help:

Check that Wrist Detection is turned on and that, if passcode is enabled, you are unlocking your Apple Watch after placing it on your wrist:

• On your iPhone, in the Watch app, go to: My Watch (tab) > Passcode > turn Wrist Detection on.

Check that you are wearing your Apple Watch sufficiently snugly on the top of your wrist (if it is worn too loosely, your watch may believe that it has been removed).

• Note that Wrist Detection can be affected by temporary or permanent skin changes, such as by some wrist tattoos.
• Your heart rate. What it means, and where on Apple Watch you’ll find it. - Apple Support

On your iPhone, go to: Settings > Privacy > Motion & Fitness - check that both Fitness Tracking and Health are enabled.

On your iPhone, in the Watch app, go to: My Watch > Privacy > Motion & Fitness - check that both Fitness Tracking and Heart Rate are enabled.

Restart both your iPhone and your Apple Watch (normally):

• Close the Watch app, Activity app and Health app (if open) on your iPhone:
  • Double-click the Home button, then swipe up on each app preview to close it.
• Turn both devices off together, then restart your iPhone first:
  • Restart your iPhone, iPad, or iPod touch - Apple Support
  • Restart your Apple Watch - Apple Support

If the issue persists, then it may help to unpair and re-pair your Apple Watch:

• The Watch app on your iPhone takes a backup of your watch automatically when unpairing via the app.
• Initially choose to Restore from Backup during set up (most data and settings will be restored, with some exceptions, such as Apple Pay cards, passcode).
• If the issue persists, consider instead unpairing and setting it up as a new watch.
• Unpair your Apple Watch and iPhone - Apple Support
• Set up your Apple Watch - Apple Support

If the issue persists, then I suggest that you contact Apple Support (remote diagnostics and/or mail-in service may be available, if required), make a Genius Bar reservation or visit an Apple Authorised Service Provider for assistance:

Apple Watch Service Answer Center - Apple Support

My issue is that prior to the update the heart rate data was collected each and every time I use the watch during my morning bicycle ride. Just today no heart rate data. I have the series two and no issues before the update. I have tightened the watch on my wrist as tight as possible. Bottom line heart rate data collection is Spotty.