[quote="fredrikw"]Doesn't Friel suggest a way of determining LTHR other than a Conconi test?
I was planning on doing what Friel suggested. I think he just suggests using a forty minute time trial and using your average HR for the last twenty minutes. Or maybe it is a twenty minute and use the last ten minutes, I'll have to check.
It's pretty much as you suggested though with using your HR from the 2 x 20 intervals.
I'm basing my guess just from watching my HR monitor during all the rides I did with it last summer. It would always increase to a certain point and then hover around that HR (167 bpm). It would only increase again if I had to suddenly increase the effort, for example climbing a hill or chasing someone. I have never had my HR go over 188 bpm in the time I have had my HR monitor, which is what I based my maximum on.
In the workout I did last night with the 25-20-15, the 15 was at 167 bpm and that was really tough for 15 minutes after the preceeding two intervals and I don't think I could have held it for more than another 5 minutes. Maybe... Maybe I would have surprised myself and held it for longer.
Anyway, I am going to give the real test a try this week, prolly on Saturday and see what number I get out of that.