Oxygen Transport during Exercise at Altitude

摘要: Maximal oxygen consumption \( ({\dot V_{{O_2}}}\max ) \) undergoes a progressive reduction in hypoxia both acute and chronic as appears from Fig. 1 where data various authors are summarized. Such decrease, for pressure drop of half an atmosphere (corresponding to altitude about 5500 meters) ranges between 30% 45%, independent the degree acclimatization ethnic characteristics sub.iects. Common factors known change {\dot opposite directions In are: 1) The decreased arterial O 2 saturation (%HbO2) due {P_{{I_{{O_2}}}}} possibly impairment diffusion property lung. The carbon dioxide partial pressures P{a_{{O_2}}}{\kern 1pt} and{\kern P{a_{C{O_2}}} resident highlanders well acclimatized lowlanders plotted function 2, along with corresponding HbO2 values (HbO2). At barometric 380 torr (5500 m) %HbO2 drops 80%. 2) The increased Blood hemoglobin (Hb) concentration. Hb concentration, after prolonged exposure m, may attain 130–140% sea level control value.