Table 1.
The velocity of contraction and the ATPase rate constant as a function of the load
| P/P0 | Contraction velocity, vvnm.s-1.hsl-1 | ATPase rate constant, s-1 |
|---|---|---|
| 0.00526316 | 1610.48 | 18.1578 |
| 0.0526316 | 1380.07 | 17.5316 |
| 0.105263 | 1172.8 | 16.8363 |
| 0.157895 | 1003.28 | 16.1415 |
| 0.210526 | 862.062 | 15.4473 |
| 0.263158 | 742.604 | 14.7537 |
| 0.315789 | 640.236 | 14.0606 |
| 0.368421 | 551.535 | 13.3681 |
| 0.421053 | 473.936 | 12.6761 |
| 0.473684 | 405.477 | 11.9846 |
| 0.526316 | 344.633 | 11.2937 |
| 0.578947 | 290.2 | 10.6034 |
| 0.631579 | 241.216 | 9.91354 |
| 0.684211 | 196.902 | 9.22426 |
| 0.736842 | 156.62 | 8.53553 |
| 0.789474 | 119.843 | 7.84735 |
| 0.842105 | 86.1343 | 7.1597 |
| 0.894737 | 55.1241 | 6.47259 |
| 0.947368 | 26.5012 | 5.78603 |
In He et al. [3] the velocity of contraction, V, number of fiber length per second (ML/s), is calculated by the equation: V = b (P0 - P)/(P+a), Fig. 6 of He et al. [3], where P0 = 190 kN.m-2; a/P0 = 0.42; b = 0.51. In this work the velocity of contraction was expressed in nm per second per half sarcomere: vv = hsl. ML.s-1, where hsl = 1350 nm. The ATPase constant was calculated from the equation, ATPase rate constant (s-1) = 5.1 + (18.7 × 1.94 × V)/(1+1.94 × V) where, V, is the applied shortening velocity (ML.s-1), 5.1 s-1 is the ATPase rate constant in the isometric state, 18.7 s-1 is the ATPase rate constant for shortening at infinite velocity [3].