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Accurate HIIT Training by HR Zone

Hello,

I am curious to know something, even though it may not make so much difference.

I keep in shape and after getting my HR well into Zone 5 it drops 50 bpm in 60 seconds of stopping. I am confident my HRM is spot on.

What I would like to know is, if I set my workout to do intervals with, say, 3 minutes in Zone 4, rest until HR is 120, then 60 seconds in Zone 5, I can do this, but there is one thing unclear.

Let's say that when in Z5, I stop after 50 seconds, yet my HR remains in Zone 5 for those last 10 seconds.

Does this whole minute count as training time in Zone 5? After all, this is my target.

Or because I have stopped moving, the last 10 seconds would not be valid data for training in that zone?

Basically, does optimal training have to feature exertion for every second of the workout?

I hope I kept this as simple as I set out to.

Best wishes!

Chris

Join me on Strava - Chris Trickett (with Kazkhstan flag)