Discussion: HR

Are you certain your HR device has accurate readings?

MMmmm, good point. It's brand new-ish. At sea level everything seems normal. Very weird.

Sometimes my skin is so dry at altitude I do not get good readings unless I spit and drool all over the strap.

I still say your are fit, but running fit isn't the same as skating fit. Running fit would translate better to classic.

Both those things might be true. I'll look at the strap. Skating does seem to put more stress on my sparrow's chest. I don't own any classic skis anymore. I can't be bothered dealing with kick wax.