Figure 2.

Carbon dioxide and acid-base variables during rapid ascent to and residence at 3,800 m. Data were obtained via arterial blood gas/electrolyte measures at 1,045 m (day 0), prior to ascent, and at 3,800 m on days 2 (within 24 h of arrival by rapid ascent) and 9. $A:{\text{Pa}}_{{\text{CO}}_2}$ partial pressure of arterial carbon dioxide. $B:\left[{\mathrm{H}\mathrm{C}\mathrm{O}}_3^{-}\right]$a, arterial bicarbonate concentration. C: pHa, arterial pH. *Different than day 0. †Different than previous day. Presented as means ± SD. n = 16. NSD, nonsignificant difference.