Help understanding Pa:HR on recent WKO
I'm trying to figure out what a largely negative PA:HR means - Sunday went on a 2:50 / 50 mile ride. My goal was to ride steady, around 70-75%. current FTP is 224
Overall data for ride: - 14 mile/hr wind in face on way out, at back on the return home
2:48:32, IF: 0.705, VI 1.08, PA:HR -4.41%
AVG PWR 146 NP 158, AVG HR 119
Lap 1 - into wind 1:24, IF 0.717, avg 150, NP 161, AVG HR 121, avg speed 17.3
Lap 2 - downwind 1:23 (got stuck at a bunch of stop lights) IF 0.69, AVF power 142, NP 155, avg HR 117, avg speed 17.6
Looking at middle 30 miles - barely any stops: 1:34, IF 0.74, VI 1.04, AVG pwr 161, avg HR 123, AVG speed 18.8
So the numbers are a little wierd for me - the first is the average HR. there were numerous times that I was looking down at my garmin and found that my HR was 110-120 even when pushing + 21mph which is a good day of riding for me. I'm not too concerned about the IF's, for the middle 30 miles with the minimal stops I pretty much accomplished the task I set out to accomplish - steady ride, FTP 70-75%, keeping HR in check...although apparently it was really low. I felt a little tired starting the ride, not necessarily legs but just overall tired.
So here are my questions:
1- what does the negative PA:HR mean? - i know that it is related to aerobic decoupling, but haven't seen negative numbers much
2- should I worry about the really low HR?
thanks
Comments
@ patrick - here is a screen shot of the ride.
I found this link by friel - http://home.trainingpeaks.com/articles/cycling/efficiency-factor-and-decoupling,-by-joe-friel.aspx
so i guess it isn't really a "bad" thing. from the website..."I like to see athletes achieve a decoupling of 5% or less (negative numbers are, of course, less than a positive 5% and may reflect outside variables such as warm-up and weather but are assumed to be good results). "
cramer