I'm training to climb large mountains. What kind of ascent should I train for at altitude. Let's say above 12000 feet and carrying up to 60 lbs?
According the the UIAA: International Mountaineering and Climbing Federation
This is of course only a generalization, and individual rates of ascent will be different.
If the following symptoms occur, you are climbing too quickly and should descend. They are symptoms of Acute Mountain Sickness "AMS" and could lead to High Altitude Cerebral Edema "HACE", or High Altitude Pulmonary Edema "HACE", if left unchecked.
More information on common mountain illness and related questions. UIAA - Frequently Asked Questions
AMS Symptoms can elevate to the following.
Symptoms generally associated with more severe acute mountain sickness include:
For more information see the link below. Medicine Plus: AMS - Symptoms and treatment