just another gosling
Join Date: Feb 2007
Location: Everett, WA
Bikes: CoMo Speedster 2003, Trek 5200, CAAD 9, Fred 2004
Mentioned: 27 Post(s)
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I have the same thing, but not as large a difference in HRs. For me, 125 on the rollers is about the same leg effort as 135 outdoors. It's just the excitement of riding outside vs. the boredom of riding inside. Same effort, different hormone levels. Yes, steady state rides indoors will do you good, but obviously not as much good as steady state rides outside.
Indoors, try kicking up your HR a couple of times in the first half hour, say 2 ea. 2 minute intervals at high cadence and effort, least LT or better effort, though HR may not reach LT in 2 minutes. Your second half hour might then go a little better. OTOH, if you are wanting to do recovery rides indoors, then what you are doing is exactly right. That type of riding will recover you, while still adding some conditioning to your legs.
To keep indoor riding productive, you can do stuff you can't easily do outdoors, like one-legged pedaling drills and high cadence (115 or better) drills.