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@Dammit
I'm out in Colorado again, went for an early morning ride into the front range of the Rockies today:
http://tpks.ws/BnfJ
Interestingly I did something very similar last time I was here and the altitude really made itself felt - we're around 1,600m up here.
This time round I was fine - only difference is that this time I have been for a hike (yesterday) to 4,350m, which was very interesting given I came from sea level the day before!
The power/HR/etc from todays ride looks as I would expect in terms of PE.
I wonder if it's psychosomatic, or a biological process?