It's been an interesting 6 years since I first published my "case report" proposing DFA a1 as a surrogate for the established endurance exercise thresholds. Since that time, the concept has gathered momentum with multiple publications by various groups. I've been fortunate to have been able to team up with Thomas Gronwald (originally) and, over the past few years, with Juan Murias and his (former) PhD student Pablo Fleitas-Paniagua. Along the way, we have studied some novel topics, including a revision of the first HRV threshold, effects of ramp slope on HRVTs, obtaining the HRVT2/MMSS via a submaximal ramp, demonstrating the potential of a1 as a measure of durability, validating Fatmaxxer and HRVTs under hypoxic conditions. Given the numerous positive studies demonstrating the utility of DFA a1 as a surrogate for established exercise thresholds and durability, we wrote an article advocating for widespread adoption of this measure in appropriate demographic groups. It is officially out today, in Exercise and Sports Science Reviews. Let's hope the folks at Garmin, Apple and Google take note, although we now have apps that will report DFA a1 in real time for each brand of device.
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