Subject: RE: Heart rate zones without LT testYou might find that an LT test is not as expensive as you thought -- many universities have labs where they'll do the test for a smallish fee. As a percentage of the total that you're likely to spend for your IM, the amount is trivial.
There are protocols out there for rolling your own LT test. (Triathlete’s Training Bible has one, for example.) I myself go mostly by RPE, but I also wear the HR monitor from time to time, as a backup check. Having it can help one distinguish between those days where HR is just higher than normal for whatever reasons, and those days where one really is training too hard (or too slow).
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