I’m interested in surveying the daily HRV range of others in this group (in addition to Mathew’s and Alan’s reports of 16-22 and 77-100, respectively). I’m doing a comparison of multiple HRV apps that I will share in detail later, but one thing is already clear: my HRV range is much lower than my Wahoo Tickr ( with EliteHRV and Kubios apps) previously led me to believe. My rMSSD (which Oura uses as the HRV metric) across various apps (with Polar HRM) is between a narrow range of 14 -22 ms. Of course, aging is known to reduce HRV 
But how to increase your HRV? Cavell says in Midlife Cyclist that mindful breathing and meditation are the best ways to raise HRV. Well, I’ve been faithfully doing mindful meditation for four years. I wonder how low my HRV would be if I hadn’t adopted that practice! 
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