Variable | Cardiac disease | Pulmonary disease |
---|---|---|
Peak V̇o2, peak oxygen uptake; Heart rate reserve, difference between predicted maximum heart rate and attained heart rate with maximum exercise; Oxygen pulse, O2 uptake divided by heart rate, represents O2 extracted by the tissues from O2 carried in each stroke volume; V̇o2 workload ratio, represents the efficiency of muscular work; Pao2, arterial oxygen tension. | ||
Peak V̇o2 | Reduced | Reduced |
Heart rate reserve | Usually none | Increased |
Anaerobic threshold | Reduced (<40% predicted) | Normal or not achieved |
Oxygen pulse | Reduced | Normal |
V̇o2 workload ratio | Reduced | Normal |
Peak Pao2 or O2 saturation | Normal | Decreased |