I had a look at the Polar API docs and didn’t find any mention of that morning HRV test data. It doesn’t look like it comes through as an exercise either.
Intervals.icu does process the nightly recharge stuff and uses that for resting HR:
- hrv = recharge.heart_rate_variability_avg
- readiness = recharge.nightly_recharge_status
- avgSleepingHR = recharge.heart_rate_avg
- restingHR = recharge.heart_rate_avg