Hi-I'm on my final week of Eric's 20 week marathon training program and am running Chicago Marathon next weekend. I'll be wearing my heartrate monitor during the race to hopefully keep me from going out too fast. My question is about heartrate zone. Assuming I trained correctly, can I expect to sustain a heartrate in zone 4 (subthreshold) for marathon distance? Or Zone3? Or should I just go by pace? Thanks-- Barb

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Hi Barb - I would use your HR monitor and stay within zone 3 during the first few miles and then settle into zone 4 until you get to mile 20-22.  At this point, if you can pick it up, do so and run by feel to the end.

If you have a very specific time goal and you have been monitoring pace with your HR training runs, you could certainly try to run by pace.  But trust your HR and what you have learned during the training.

Great success to you and let us know how it goes.

E

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