| a | activator (Ca2+) concentration |
| a,b | constants |
| Act | crossbridge activation level |
| CE | contractile element |
| f | function of... |
| G | Po/a = Vmax/b |
| HL | `labile' heat |
| HM | `stable' heat |
| HS | `shortening' heat |
| HT | `thermoelastic' heat |
| K | value of a at which 50% of the crossbridge activation sites are occupied |
| LCE | length of the CE |
| LMTU | length of the MTU |
| Lo | optimal muscle fibre length |
| LSEE | length of the SEE |
| MTU | muscle–tendon unit |
| n | Hill coefficient |
| P | instantaneous force produced by muscle |
| P′ | maximum isometric force scaled by muscle velocity |
| Po | normalised maximum isometric force |
| S | relative SEE stiffness |
| SEE | series elastic element |
| SH | upper limit to the relative stiffness |
| SL | lower limit to the relative stiffness |
| t | time |
| VCE | contractile element velocity |
| Vmax | maximum shortening velocity |
| Xo | force relative to Po where stiffness changes from SH to SL |
| τ1, τ2 | time constants |
| a | activator (Ca2+) concentration |
| a,b | constants |
| Act | crossbridge activation level |
| CE | contractile element |
| f | function of... |
| G | Po/a = Vmax/b |
| HL | `labile' heat |
| HM | `stable' heat |
| HS | `shortening' heat |
| HT | `thermoelastic' heat |
| K | value of a at which 50% of the crossbridge activation sites are occupied |
| LCE | length of the CE |
| LMTU | length of the MTU |
| Lo | optimal muscle fibre length |
| LSEE | length of the SEE |
| MTU | muscle–tendon unit |
| n | Hill coefficient |
| P | instantaneous force produced by muscle |
| P′ | maximum isometric force scaled by muscle velocity |
| Po | normalised maximum isometric force |
| S | relative SEE stiffness |
| SEE | series elastic element |
| SH | upper limit to the relative stiffness |
| SL | lower limit to the relative stiffness |
| t | time |
| VCE | contractile element velocity |
| Vmax | maximum shortening velocity |
| Xo | force relative to Po where stiffness changes from SH to SL |
| τ1, τ2 | time constants |