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Anaerobic Threshold???(11 posts)

Anaerobic Threshold???garhead
Aug 23, 2002 2:24 PM
What exactly is it & is there a simple way to compute it??? I have a resting HR of 60 and when it hits 170 I'm looking for the top of the hill for sure.

AT and LTKerry
Aug 23, 2002 3:58 PM
Anaerobic threshold and lactate threshold - often said to be the same thing, and for your purposes, they are. The easiest way to determine your LT/AT is to warm up thoroughly and then do a 10 mile/16 km time trial on flat roads. The HR that you can sustain over that distance is your AT/LT. Just be sure that you are going full out for the distance. Once you have this number, you can structure your training around it. Or, if you don't do structured training, you can use it to baffle/dazzle your friends, riding buddies, and gym geeks.
AT and LTgarhead
Aug 23, 2002 4:19 PM
Kerry, I suspect that # is in the 148-155 range. Now what does it mean & how can I use it. I do know that when I got into riding a year ago that # was in the mid-130's.
Thanks again
Structured trainingKerry
Aug 23, 2002 4:54 PM
At this point, it would make sense to get a book (like Joe Friel's "The Cyclist's Training Bible") to study how to use LT/AT in a structured training program. There's a lot to discuss about your goals, your current fitness, your annual mileage, etc. before building a program. Reading up on the subject would be most useful to you.
Anaerobic ThresholdCaptain Morgan
Aug 23, 2002 6:50 PM
It just so happens that I have been doing some research on this subject. I am a newbie cyclist but am a fairly avid runner.

I do not think there is an exact calculation for this, because there are too many factors (ex. age, weight, fitness level). However, as a general rule, the aerobic zone is somewhere between 60% and 70% of your maximum heart rate. The anaerobic threshold kicks in around 80% for most people.
Anaerobic ThresholdJames OCLV
Aug 24, 2002 5:48 AM
You can't really go by %'s and get an accurate number. For example, I'm 29. According to the formula's, my Max HR should be 191, and 80% of that is ~153. In my race last night, my HR hit 195 in the final sprint, with an average HR of 176. I know from previous tests that my LT is ~178. No where close to what the formula predicted.

To be the most accurate, do the TT test described above, and your "average" HR is your approximate LT. Then, base your "zones" off of this number.
Anaerobic ThresholdCaptain Morgan
Aug 24, 2002 11:24 AM
I agree that the formula is very simplistic and is for the average person. I am 37, so my maximum is 183. I find my peak sustainable performance (running or cycling) between 150 and 160. When I start sneaking up into the 160's, I begin to feel a little winded. I then get into the 170's only at the end.

As a prior post stated, maximum heart rate is NOT the same as lactate threshold. I have read where a 5km TT would average 95%. That doesn't mean that it isn't an anaerobic ride. However, it is obvious that this HR is unsustainable for longer rides.
re: Anaerobic Threshold???ajgibbons
Aug 24, 2002 12:06 PM
I agree with the above post (James OCLV) - the "standard" percentages for AT/LT to MHR just don't seem to work. It does bring up a question that I'd really like to hear some personal experiences on: "How does/should your AT/LT-to-MHR percentage change, if at all, when reaching higher levels of conditioning?"

BTW, anyone who would ask a question like this (me) and anyone who considers answering it, has probably gone over the "quantitative" edge, but we all spend far too many hours looking at that HRM and I guess we need to think of something!
re: Anaerobic Threshold???garhead
Aug 25, 2002 3:40 AM
but what exactly is Anaerobic Threshold?
re: Anaerobic Threshold???ajgibbons
Aug 25, 2002 9:51 AM
Garhead, sorry the replies got off your question. The simple definition of AT is: The point, or threshold, that is crossed when the lungs and heart are no longer able to provide sufficient oxygen to muscles, therefore causing a radical change in metabolism (significantly increasing carbs burnt, rather than a more balanced fat and carbs).

A way to compute it is basically the same at the threadmill tests often used in annual physical exams. Here's a URL describing it:

From your "looking for the top of the hill" comment (good desciption!), it sounds as if that 170 could be a pretty close approximation for you.
re: Anaerobic Threshold???garhead
Aug 25, 2002 5:37 PM
ajgibbons Thank You. That is a great link!!
Thanks everyone for the additional info.