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So, for those that HR training failed, did you alternate periods of low and high HR training or just do LSD's all the time?
I guess I've been making two different points on this thread. (1) "HR Training" is often misapplied to mean "low effort training" which, when done in insufficiently massive volume, is pointless; and (2) the only point of measuring HR during training is to gauge effort. Even its advocates will admit that. All of the ranges and whatnot are merely an attempt to define appropriate training intensity ranges.
As for item (1), yes I made that mistake once and won't get fooled again. The literature surrounding our sport is overly saturated with advice to back off and don't push it and take it easy and go slow and everything will come to you the easy way. It won't. It's hard, and you've got to train either very hard or very "a lot" if you want to realize your potential.
As for (2): Since the only point of measuring HR is to gauge effort, I think it is sensible to ask whether there is a better way of gauging effort. In fact, there is! It's called pace when running and power when cycling. Even Friel gives a very clear warning in his
TTB:
"...[T]he problem is now that heart rate-based training has become so pervasive that athletes too often believe that heart rate is the determining factor in how they train and race. Too many have become slaves to their heart rate monitors, and other skills for measuring intensity are fading....Relying on it to the exclusion of all other measures of intensity can be as detrimental to your training as not having any gauge of effort at all." (Friel, pg. 49)
The original post in this thread asked about staying in something called "the aerobic training zone." I initially responded that the "aerobic training zone" is far, far wider than many triathletes realize.
The thread has sort of changed to a debate on the usefulness of a HR monitor. I think its not as useful as its been made out to be.
I can do a tempo run by running my HR up to 172 and holding there. Or, I can do it by running at 7:15 pace. The 172 might be low that day, or too high. Who knows? It drifts around. The 7:15 is the real thing. I'll know to move up to 7:05 pace when I can finish my 2x 20 minute run session with a solid 7:05 on the second 20 minutes. My improvement markers are in the pace, not the HR. As my pace on the 2x 20s improves, I will pick up the pace accordingly at all other distances and efforts. The 2x 20 is my "anchor point" that serves as a reference to all workouts.
This change away from using "LT Heart Rate" or "max Heart Rate" as a reference point is important, and I believe everyone would benefit from the change.