I’ve repeatedly tried using HRV4Training and it didn’t add any value to training readiness. On the other hand, on the few occasions in the last year where I started riding and quickly realized something was terribly wrong, it was reflected in the Garmin Performance Condition (which uses HRV). My HRV is relative low for the general population, although Marco Altini published some data by age groups and its on the low end of normal for my age. As a result of some changes to training and ‘life’, my HRV values have almost doubled (looking like normal values for general population) so perhaps its time to try again.
@bobmac thanks for the summary. I’ll keep doing the morning HRV readings on my Apple Watch and see if recent improvements to my HRV have any correlation to training.