found that the barometric pressure was higher than they previously had thought and that the estimated V02 max was about 15 ml kg-1 min-1 at this altitude.
Those who are successful at these high altitudes have a great capacity to hyperventilate. This drives down the PCO2 and the [H+] in blood and allows more oxygen to bind with hemoglobin at the same arterial PO2
Finally, those who are successful at climbing to extreme altitude must contend with the loss of appetite that results in a reduction in body weight and in the cross-sectional area of type I and type II muscle fibers.