Properties of the dogfish Scyliorhinus canicula white myotomal muscle and mouse soleus muscle
| . | Cycle frequency . | Muscle properties . | . | . | . | . | . | . | Optimised activation parameters . | . | . | . | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Muscle type . | . | Po (N) . | Lo (mm) . | Vmax (Lo s-1) . | G . | SL (Po/Lo) . | SH (Po/Lo) . | Xo . | τ1 . | τ2 . | K . | n . | |||||||||
| Dogfish | 0.71 | 47 | 7.3 | 3.8 | 4 | 16 | 22 | 0.15 | 0.035 | 0.1 | 0.16 | 2.2 | |||||||||
| Dogfish | 1.25 | 60 | 7.3 | 3.8 | 4 | 16 | 22 | 0.15 | 0.035 | 0.1 | 0.19 | 2.8 | |||||||||
| Dogfish | 5 | 50 | 7.3 | 3.8 | 4 | 16 | 22 | 0.15 | 0.035 | 0.1 | 0.25 | 6 | |||||||||
| Mouse | 3 | 48 | 11.5 | 4 | 4 | 16 | 22 | 0.15 | 0.045 | 0.045 | 0.22 | 2.69 | |||||||||
| . | Cycle frequency . | Muscle properties . | . | . | . | . | . | . | Optimised activation parameters . | . | . | . | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Muscle type . | . | Po (N) . | Lo (mm) . | Vmax (Lo s-1) . | G . | SL (Po/Lo) . | SH (Po/Lo) . | Xo . | τ1 . | τ2 . | K . | n . | |||||||||
| Dogfish | 0.71 | 47 | 7.3 | 3.8 | 4 | 16 | 22 | 0.15 | 0.035 | 0.1 | 0.16 | 2.2 | |||||||||
| Dogfish | 1.25 | 60 | 7.3 | 3.8 | 4 | 16 | 22 | 0.15 | 0.035 | 0.1 | 0.19 | 2.8 | |||||||||
| Dogfish | 5 | 50 | 7.3 | 3.8 | 4 | 16 | 22 | 0.15 | 0.035 | 0.1 | 0.25 | 6 | |||||||||
| Mouse | 3 | 48 | 11.5 | 4 | 4 | 16 | 22 | 0.15 | 0.045 | 0.045 | 0.22 | 2.69 | |||||||||
The parameters are explained in Eq. 1-3 and 7 and in the List of symbols and abbreviations. Activation parameters (τ1,τ 2, K and n) were optimised to produce a best fit for the force—time data across a range of activation conditions at each cycle frequency. Po represents the maximum isometric force of the muscle and differs between cycle frequencies due to muscle fatigue in the experimental protocol (for details of this procedure, see Curtin and Woledge, 1996). Lo is the optimal length to achieve Po.