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Figure 3 Relation between peak volume of oxygen (VO₂) (horizontal axis, A and B) and proximal thoracic aortic distensibility (vertical axis, A) and cardiac cycle-dependent changes in aortic area (vertical axis, B) for the 30 participants. Each symbol represents the data from one participant. The regression lines (solid lines) and equations are shown. Solid diamond = healthy young; solid square = healthy old; solid triangle = diastolic heart failure.