Table 4.
Summary of relevant mechanical parameters (mean values) from the two kinds of experiments (force–pCa experiments and force–velocity experiments) in slow and fast 2A/2X fibres
| Force–velocity experiments | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Force–pCa experiments | Isometric | Steady lengthening | ||||||||||||
| Y0 (nm) | F0/e0 (nm) | βe0 (kPa nm−1) | T0 (kPa) | e0 (kPa nm−1) | Y0 (nm) | F0/e0 (nm) | βe0 (kPa nm−1) | Tv (kPa) | ev (kPa nm−1) | Yv (nm) | Tv/βve0 (nm) | βve0 (kPa nm−1) | T0 (kPa) | e0 (kPa nm−1) |
| Slow | ||||||||||||||
| 5.17 | 3.58 | 20.11 | 68 | 13.04 | 5.21 | 3.71 | 18.33 | 148 | 21.77 | 6.80 | 3.54 | 41.80 | 106 | 16.15 |
| Fast | ||||||||||||||
| 72 | 13.97 | 6.53 | 4.29 | 24.71 | 120 | 17.85 | 6.72 | 4.08 | 29.41 | 166 | 21.78 | 7.62 | 3.97 | 41.81 |
The parameters are: force in isometric conditions, T0, and during steady lengthening, Tv; stiffness in isometric conditions, e0, and during steady lengthening, ev; hs strain in isometric conditions, Y0, and during steady lengthening, Yv; average strain per cross-bridge in isometric conditions, F0/ɛ0, and during steady lengthening, Tv/βvɛ0; stiffness of the cross-bridges in isometric conditions, βɛ0, and during steady lengthening, βvɛ0.