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Saturday, December 19, 2020

Frontiers in Physiology - Validation of DFA a1 as a marker of VT1

Although many prior posts in this blog assumed DFA a1 reached VT1 at about .75, until yesterday, no published peer reviewed data existed to verify this concept.  However, we now have a high quality validation study published in Frontiers in Physiology confirming that.  Before getting into a brief summary of our findings I would like to thank both my co authors, the Frontiers reviewers (Drs Lars Brechtel, Daniel Boullosa) and Editor (Dr Clint Bellenger).  We were very fortunate in having reviewers who were both knowledgeable in HRV and exercise physiology (which is not a common skill set) who understood what we were trying to accomplish.  It was an incredible experience (and much fun) to work with Dave, Nick, Olaf and of course my very good friend Thomas. 

The article:


The full version is in the "production department" at this point, therefore I need to wait until it is in final form to get into more detail, review some interesting figures, stats and correlations with gas exchange.  However, the abstract should provide more assurance for using DFA a1 to help determine your VT1 and assist with the low intensity portion of zone training. 

In the meantime, the following posts should help guide implementation of using the index in practical terms:

Heart rate variability during dynamic exercise


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