just another gosling
Join Date: Feb 2007
Location: Everett, WA
Bikes: CoMo Speedster 2003, Trek 5200, CAAD 9, Fred 2004
Mentioned: 11 Post(s)
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This always happens to me during the season. Since you just started riding regularly, it will be even more noticeable for you. There's a good chance it will continue to drop. Max HR also drops. Since you can ride at LT by perceived exertion, as Greg points out, the larger thing is that it's best to figure zones off LT. If your LT drops, so do all your zones.
After a while, say a year or two, this will stabilize. You'll go up a little in the off season, and down a little during the season, and you'll just note those changes naturally.
It is true that your LT will go back up if you stop training. However that's probably not your best choice.
The other possibility is that you're overcooked. Over-reached, they call it. If you can punch on by your old LT, you're not overcooked. If your MHR is now your old LT, or even below, you are overcooked and need to take 3 days off or easy rides only, then try a tough hill again and see if you've recovered,.