thank you Jack, much appreciated. I think that there can be something useful in looking at HRV during exercise - maybe - even though the early claims (i.e. that there are absolute thresholds, you don’t need to know your max heart rate, the same principles work for everyone, etc.) have been clearly confuted, and this is another metric that must be used only after collecting plenty of data from an individual, then looking at how it changes over time and in different conditions, just like HRV at rest or heart rate during exercise. At that point, we need to evaluate if it is adding something, or if it is redundant (e.g. if in practical terms you could do the same with heart rate, which is easier to compute, less error prone, etc). I think the jury is still out, but if there is an interest in experimentation, it is totally fine and can be interesting. I just warn against taking it as something established and where absolute values have a meaning - because they really don’t. I hope this makes sense!
This is fantastic, thank you. I’ve been learning about DFA Alpha 1 - are you familiar, and what are your thoughts on its utility?
thank you Jack, much appreciated. I think that there can be something useful in looking at HRV during exercise - maybe - even though the early claims (i.e. that there are absolute thresholds, you don’t need to know your max heart rate, the same principles work for everyone, etc.) have been clearly confuted, and this is another metric that must be used only after collecting plenty of data from an individual, then looking at how it changes over time and in different conditions, just like HRV at rest or heart rate during exercise. At that point, we need to evaluate if it is adding something, or if it is redundant (e.g. if in practical terms you could do the same with heart rate, which is easier to compute, less error prone, etc). I think the jury is still out, but if there is an interest in experimentation, it is totally fine and can be interesting. I just warn against taking it as something established and where absolute values have a meaning - because they really don’t. I hope this makes sense!
Hello Marco, I’m waiting your book ;)
The aspects of resting HR versus HRV in relation to VO2max is super interesting! And also the, HRV><HR relative to age. So many great insights.
Your writing a book?! I can't wait til you are finished with your book!
thank you so much Kim!