[pvoosen]

Heat will shift the curve. When it is hotter your heart will beat faster in order to help cool you off. AeT will be affected by a lot of factors, temperature, elevation, time of day, nutrition, etc. If you want to get a more accurate measure of AeT it would probably be best to perfrom a heart rate drift test on a track during “normal” summer weather, or you could just run based on effort for the time being.

[pvoosen]

@Christian, Thanks for providing the useful graphic although I think it may be more accurate to say 5% drift per 30 min instead of 5 bpm. This graphic shows exactly what I was talking about. I have spent the morning reading through several training peaks articles and I am not sure it is safe to assume that training peaks adjusts pa:hr based on test duration.

Aerobic Decoupling compares the Efficiency factor from the first half of an activity to the second half. A smaller change in EF (less than 5%) from the first half to the second half may indicate improving aerobic endurance.

Based on the description, it seems like the first half of the workout is compared to the second half and a direct percentage is calculated without adjustment. I think this implys that for an hour long aerobic assesment showing 5% pa:hr over the entire duration, if you look at the first half of the workout you should see a value of 2.5% assuming that pa:hr is fairly linear.

Based on what I have read in training peaks article, it seems that a value of less than 5% for Pa:HR for any duration is the magic number for an effort not being “too hard”.  So should we look for a 5% Pa:HR regardless of test duration or do we need to manually adjust the percentage to fit the test duration? Logically I would think that some compensation needs to be performed for the test duration, but am just looking for confirmation.

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