Measures of cardiac structure, function and metabolism
| All participants | Young (≤50 years old, n=20) | Old (≥60 years old, n=15) | p Value | |
| Left ventricular mass (g) | 85.5±14.9 | 90.7±16.1 | 78.6±9.7 | 0.01 |
| Eccentricity ratio (g/mL) | 0.8±0.1 | 0.8±0.1 | 0.8±0.1 | 0.16 |
| Left-ventricular ejection fraction (%) | 61.7±7.7 | 58.7±7.6 | 65.8±5.8 | 0.01 |
| PCr:ATP ratio | 2.1±0.5 | 2.3±0.6 | 1.9±0.5 | 0.03 |
| Longitudinal shortening (%) | 19.4±5.9 | 19.4±3.0 | 19.5±4.9 | 0.92 |
| E:A ratio | 2.3±1.7 | 3.1±1.8 | 1.3±0.5 | 0.00 |
E;A,early-to-late diastolic filling ratio; PCr:ATP, phosphocreatine-to-ATP.