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Heart rate and out-of-breathness?

redddraggonredddraggon Posts: 10,862
On the flat @75%-80%MHR I feel good no real heavy breathing but as soon as I start doing anysort of climbing @ a steady 75% I'm out of breath.

Is it just a mental thing? Or is percieved effort not necessarily linked proportionally to % of MHR?
I like bikes...

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