Fig. 1
From: Cardiopulmonary exercise test to detect cardiac dysfunction from pulmonary vascular disease
O2·pulse at rest (O2·pulserest) and at anaerobic threshold (O2·pulseAT). (A) Normal increase in O2·pulse from rest (O2·pulserest, solid vertical line) to anaerobic threshold (O2·pulseAT, dashed vertical line). O2·pulserest was 4.5 ml O2/beat and O2·pulseAT was 14.5 ml O2/beat. (B) Pathologically low increase from O2·pulserest to O2·pulseAT. O2·pulserest was 3.8 ml O2/beat and O2·pulseAT was 7.3 ml O2/beat