TABLE 2.
Effect of activation levels at 1 and 32 μmol/liter of Ca2+
The results of experiments at 1 and 32 μmol/liter of Ca2+ are compared, corresponding to half- and full activation, respectively. Force enhancement at the end of stretch is the ratio of peak force at the end of stretch compared to the force in the isometric state prior to the stretch.
| Effect of activation levels at 1 and 32 μmol/liter of Ca2+ | Ratio of force levels | Ratio of Pi release rates |
|---|---|---|
| First turnover | 1 | 1.04 |
| Isometric steady state | 0.5 | 0.63 |
| Force enhancement at end of stretch and Pi release during stretch | 1.38 | 1.13 |
| Isometric state after stretch | 0.68 | 0.94 |
| Force at end of release and Pi release during shortening | 0.56 | 0.74 |
| Isometric steady state after release | 0.45 | 0.48 |