gasp!  Someone is complaining about the heat in the B&B forum!  (Psst, AL4, we are supposed to acknowledge the heat just so that others know what we are suffering through, then say it's "just the way I like it.")

Surely someone has some heat conversion charts to recommend here?  IMHO, I'd just work with perceived effort pace, then be happily surprised when cooler temps arrive.

Pete Pfitzinger writes:
Heart rate increases at high temperatures. Your heart rate is higher when running on a hot day. As the temperature increases from 60 degrees to 75 degrees, a runner�s heart rate at a given speed increases by about 2 to 4 beats per minute. When the temperature increases from 75 degrees to 90 degrees, you can expect your heart rate running at a given speed to increase by approximately 10 beats per minute. High humidity magnifies the effect of high temperatures on heart rate.

To gain the same benefits as on a cool day, you should increase your heart rate zones by 2 to 4 beats per minute when the temperature is in the 70's and the humidity is low. On a high humidity day in the 70's or a low humidity day in the 80's, you should increase your zones by approximately 5 to 8 beats per minute to correct for the heat factor. In more extreme conditions, such as a high humidity day over 80 degrees, you cannot accurately adjust your heart rate zones for the conditions. On the most brutal summer days, it is wise to adjust your training schedule to avoid high intensity training.

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I am not a Galloway basher (usually), but, big BUT, his heat numbers are rubbish!

I ran Boston in heat that is off his chart, beyond 85 deg.
Impact less than 10%.

In a 5k, I'd expect seconds of heat penalty, 1%? 2%, again beyond 85 deg.

Ok, maybe I'm a heat runner. But no one but a NON-runner would go by those.

caig
i

After this silly arguing, I wish I hadn't said anything about Galloway at all.