Originally Posted by
chinarider
But I am somewhat confused by it. I understand that it more accurately tells you how much work you're performing and allows for precise replication of workouts. But if the point of training is to induce adaptations by stressing the body, how does it gauge this? Assume I do the same power based workout on 2 different days. The first time I'm at a HR of x bpm; the next time, because of rest, biorhythms , etc I'm at x + 10 bpm. Haven't I worked harder the second time? Or if, as a result of training, I'm now able to do the workout at x-10 bpm,, am I not working less hard & need to increase intensity to continue to produce adaptations?And if I only use power, how will I know this?
Off the subject, I know, but I've wondered about this.
You need to perform periodic tests to determine your threshold (FTP) and/or shorter term power levels. Generally you would do your intervals at a fixed percentage of your FTP so as you become stronger you also work harder.
Training with power makes it easier to do shorter intervals 1-5 minutes where HR doesn't have time to respond.
HR can be higher for a variety of reasons like outdoor temperature or state of hydration. However, just because it's hot outside and your heart is working a little harder to keep you cool doesn't mean your muscles are getting a better workout.