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Figure 2 Left ventricular volumes and pump function. End-diastolic volume index (EDVI) (A) remained relatively constant throughout exercise in both groups but was consistently higher in older subjects. End-systolic volume index (ESVI) (B) declined between 10 and 40 min in both groups, though to a greater extent in younger subjects. Conversely, ejection fraction (EF) (C) increased in both groups but to a lesser extent in the older group. Contractility index, defined as systolic blood pressure/ESVI (D), increased in the young but did not change significantly in the older group.
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