Originally Posted by
Steamer
RPE, breathing, etc. are great, perhaps the best measures of the internal cost of a given effort. But if one wants to see a number displayed and track that data with a device, that's not really much of an option yet. Garmins will display breathing rate, trying to use HRV data via a chest strap to indirectly estimate breathing rate, but it's only semi-accurate. It seems ok for low level (Z2 efforts), but anything much harder than that and the accuracy seems pretty bad.
I also use a device which displays a number and records all the stats for the ride - a Garmin 1030. I know what my breathing is like in zones 2, 4, and 5. Z3 therefore is whatever is between 2 and 4.
