Table 2.
Active and passive stresses from isolated myocyte bundles
| Control | Moderate | High | Extra High | |
|---|---|---|---|---|
| Maximal active stress, kN/m2 | 21.5 ± 2.8 | 18.2 ± 2.9 | 16.4 ± 4.1 | 17.3 ± 4.1 |
| SL = 2.2 μm | ||||
| Passive stress, kN/m2 | 2.4 ± 0.5 | 3.8 ± 0.6 | 4.1 ± 0.5 | 3.3 ± 0.8 |
| SL = 2.42μm | ||||
| Peak stress, kN/m2 | 9.8 ± 2.1 | 25.1 ± 5.6 | 28.3 ± 5.2 | 21.8 ± 5.4 |
| Steady state stress, kN/m2 | 5.3 ± 1.3 | 14.2 + 3.4 | 16.9 ± 3.7* | 8.2 ± 1.1 |
| Ratio of steady-state to peak stress, % | 52.6 ± 2.3 | 53.7 ± 0.4 | 55.8 ± 2.9 | 47.3 ± 8.0 |
| SL = 2.53μm | ||||
| Peak stress, kN/m2 | 15.8 ± 3.9 | 35.5 ± 5.9 | 49.1 ± 9.3* | 26.7 ± 4.1 |
| Steady state stress, kN/m2 | 10.1 ± 2.6 | 23.8 ± 4.2 | 33.8 ± 7.2* | 16.5 ± 2.7 |
| Ratio of steady-state to peak stress, % | 62.6 ± 2.7 | 62.6 ± 0.4 | 65.6 ± 2.1 | 61.3 ± 1.5 |
Values are means ± SE.
*
Significant difference from control group animals.