Short bursts like that are fine. Nothing to worry about.
I’m trying to use TFtUA principles to train for long mountainous MTB races. (I do more on point stuff in the winter). I’m racing a SS, but using a geared bike for most training rides to avoid mixing ME workouts with aerobic base workouts. My question is, on some 4-6 hour rides I stay in z1 and z2 the entire time, getting off and walking on short steep technical climbs where that wouldn’t be possible riding. Except that 3 or 4 times each ride my hr spikes a few bpm above AeT for 30 seconds or so when a feature catches me off guard, etc. How stressed should I be about this and how harmful are these few spikes to the overall point of the workout?
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