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David Hays logrun

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Post  mul21 on Mon Feb 20, 2012 8:08 pm

How does this thing calculate the HR%? The numbers it spits out for me make no sense whatsoever.
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Post  Dave-O on Tue Feb 21, 2012 10:39 am

I think it uses Heart Rate Reserve instead of straight Heart Rate percentage of max. Thats why you need to provide your resting heart rate. Here's an article from Pfitzinger about heart rate reserve.

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Post  mul21 on Tue Feb 21, 2012 12:39 pm

I thought it was going to be something like that but it didn't explicitly say that anywhere so I wasn't sure. Good news is that based on this table:

Heart rate training zones


Workout Percent HRR
Lactate threshold 76-88
Long runs 65-78
Recovery runs <70
I was right where I need to be on my last 2 runs. 71% of HRR on my long run and 64% on my recovery run yesterday. That is assuming, of course, my Max and Resting HR numbers are accurate.
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Post  Jerry on Tue Feb 21, 2012 1:56 pm

Pfitzinger's book has a little more detail:

VO2Max: 93-98%.
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