The arterial blood gases and pH do not significantly change during moderate exercise because ventilation increases during exercise to keep pace with the increased metabolism. Adjustments are also made at high altitude in both the control of ventilation and the oxygen transport ability of the blood to permit adequate delivery of oxygen to the tissues.
■ Figure 16.41 The effect of exercise on arterial blood gases and pH. Notice that there are no consistent or significant changes in these measurements during the first several minutes of moderate and heavy exercise, and that only the PCO2 changes (actually decreases) during more prolonged exercise.
Changes in ventilation and oxygen delivery occur during exercise and during acclimatization to a high altitude. These changes help to compensate for the increased metabolic rate during exercise and for the decreased arterial Po2 at high altitudes.
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