Peter Attia· MD
for me the har variability har variability is it's more at a broader spectrum and it's more on the um you know the um adrenergic activation that you have so for example uh your fatigue today right first of all normally you're going to wake up with your resting heart rate littleit bit higher than normally so that that that if your normal heart rate let's say it's 50 and you're being fatigue you might wake up with 65 so that alone is a hard variability concept it it varies from from the norm to one day so that's a red flag that you might be tired that day might not happen all the day I mean might not be super sensitive but it is very sensitive for elite athletes without a doubt the second aspect is like when you go out there and exercise as you might see there are days that you were like 130 bits per minute whatever you think you're Zone to is 130 38 for example um but some days it's really hard to get the heart rate right extremely hard and and you're already struggling at 110 bits per minute or 115 bits per minute where that's not the norm that's another deviation that's a variability of the heart right so this is what I've been historically used for hair heart rate variability which tells me a lot more information this is what all the athletes also tell you like man my heart doesn't get up today you see on training picks you know you see when someone is fatigued they do an interval and they know they always 180 185 let's say they like to thresold and today they cannot get up until more than 170 you see in the competition the first week of the through the fronts their maximum maximum heart rate let's say it's 195 last week the maximum heart rate is a 70 right that's that's what I interpret by har variability and I know that a lot of people might criticize me because oh that has nothing to do well I respect all that no I think it's macro versus micro I agree is how I read it as macro versus micro