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.
What is slowing me down?
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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