Not sure what your training has been like, but honestly sounds like good old fashioned altitude sickness. It can strike even when you have never had trouble in the past.
I just got back from a steep couloir snow climb and was having trouble with my pacing. In the couloir I could not keep a constant pace, I had to stop and rest every 10-15 steps. It didn’t feel like my heartrate slowing me, but rather my breathing and my legs. I had to stop to let my calfs and glutes rest. As well as catch my breathe. My heartrate hardly went into low Zone 2, mostly it stayed in Zone 1 the whole time.
I was at 12,000-13,000′ during the climb, and carrying a day pack + skis. Typically I’ve found that I am a bit slower at that altitude, but not this slow.
Does anyone have thoughts as to if this was a deficiency in Aerobic capacity, or in leg/muscle strength? Or both?
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