HR varies widely by individual. Same age, some folks may have a HR of 160 at what is an easy pace, while someone else may be at 130.

Comparing pace and height/weight may be a better way to look at things.

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Are you doing a study? What really are you interested in finding out? Are you trying to determine how fast to run your IM?

Yes I'm trying to figure out roughly what pace I should aim for. I'm 39, 6'1" 182lbs and my max HR is around 181-182. Right now, I do my long runs at average HR of 139 in 7:39 pace on a hilly run and flat course 7:19ish.

perhaps there is some correlation between easy run pace and IM run pace, but only if you're running easy enough in training and pacing the bike right in training.

Any 10k/10mi/13.1mi race times? Half IM fast run times?

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My recommendation based on my personal experience is your IM goal pace is a pace during your training runs that feels so easy that you're embarrassed to be going "this slow". ;) Now this changes if this is your 10th IM vs. your first plus if this is your 10th marathon vs. first time running a marathon as well.

I also break up the IM run into 3 segments(first 10 miles, 8 miles and then the final 8) and tweak my effort/pace for each of those segments. In order to go the fastest overall, I believe in doing lots of "tempo" miles at half IM pace.

Hope that helps...

Might be helpful

http://community.runnersworld.com/...af-pace-and-5k-times

This may help as a starting point for pace decisions. Thank Ale Martinez for the fine work.

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Genetics load the gun, lifestyle pulls the trigger.

This. I ran a 3:30 at IMLOU (148lb, 6ft, hr in the 16Xbpm range, 208 max) and 8 min/miles were stupid easy during training (<140bpm). During my training runs I always had treadmill dreams of running 7:15-7:30 because "they felt pretty easy". A couple solid brick runs (5-8 miles) after 5 hr rides changed that real quick. I personally am not a big fan of bricks from a "training" perspective, but believe they provide great value from a race pacing perspective.

139bpm is (zone 3) for a max of 181 based on the calculator i am looking. What is your pace at 116bpm? That looks like it is the top of Z1 for a max of 181. Very few people can run in Z2 for the IM marathon.

I use Joe Friel's HR ranges and based on his calculation my Zone 1 is less 149 bpm. My LTHR is around 174 when I tested it last year with the 30 min test.

I never really pay attention to HR except in post-event analysis...

I am 5'7", 148lbs, 35yo

I run my easy runs around 7:30ish pace and my HR is generally in the mid-140s for that

Ran my last IM marathon in 3:24 (7:53 avg) at an average heart rate of 154bpm (Positive split of 2 minutes)

For reference my last open marathon was 3:04 (7:01 avg) at 163bpm (also a 2-minute positive split)