Yes, altitude will impact HR. You might find this forum discussion helpful –
Almost all my training is done at sea level and hence AeT, Z1, Z2 etc are sea level based. I’m now out in the Alps and working between 1500m and 3000m. Today I did a 1200m skin up from 1500m to 2700m and my HR was about 20bpm higher than I would have expected at sea level. I guess the less oxygen at this altitude will have an impact – anyone have any views or even facts?
Thanks as always,
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