Table 3 Left ventricular speckle tracking echocardiography parameters of healthy males
| Â | Young | Middle | Older |
|---|---|---|---|
|  | < 40 years old | 40-65 years old | > 65 years old |
|  | (n = 14) | (n = 13) | (n = 13) |
Longitudinal axis | Â | Â | Â |
Strain (%) | -20.6 (2.4) | -19.3 (2.9) | -15.7 (3.4)***### |
Diastolic SR (%.sec-1) | 1.5 (0.3) | 1.3 (0.3) | 1.1 (0.2)***# |
Systolic SR (%.sec-1) | -1.0 (0.2) | -1.0 (0.2) | -0.9 (0.2) |
Base circumferential | Â | Â | Â |
Strain (%) | -16.5 (3.7) | -16.8 (5.9) | -15.8 (2.6) |
Diastolic SR (%.sec-1) | 1.5 (0.3) | 1.6 (0.4) | 1.2 (0.3) |
Systolic SR (%.sec-1) | -1.0 (0.2) | -1.1 (0.3) | -1.1 (0.3) |
Apex circumferential | Â | Â | Â |
Strain (%) | -21.4 (2.7) | -26.0 (5.8)* | -26.8 (3.0)* |
Diastolic SR (%.sec-1) | 1.8 (0.3) | 2.2 (0.9) | 2.0 (0.4) |
Systolic SR (%.sec-1) | -1.2 (0.2) | -1.5 (0.3)* | -1.7 (0.3)* |
Rotational mechanics | Â | Â | Â |
Apical rotation (°) | 4.1 (2.1) | 6.4 (2.2)* | 6.1 (2.1)* |
Basal rotation (°) | -4.6 (1.6) | -5.5 (2.5) | -6.4 (3.1) |
Peak twist (°) | 6.6 (2.2) | 8.1 (3.6) | 11.6 (2.1)* |
Peak untwist-rate (°.sec-1) | -65.0 (19.5) | -82.9 (16.0) | -92.4 (22.1)* |