Table 2.

Mechanical model parameters. It is noticed that in the current model formulation only the ratio (and not the absolute values) between $k_{\text{XB}}$ and ${\delta }_{\text{m}}$ is required. Some of the fitted parameters were restrained between specific ranges of values: 0.13 $\le$ $h_w$ $\le$ 0.40, 1.0 $\le$ ${\lambda }_z$ $\le$ 1.5, 1.0 $\le$ $k_{\omega }$ $\le$ 1.5, 0.1 r.v. $\le$ $u_{\text{PS}}$ $\le$ 10.0 r.v., 0.1 r.v. $\le$ $\frac{k_{\text{XB}}}{{\delta }_{\text{m}}}$ $\le$ 10.0 r.v., 0.1 r.v. $\le$ $k_{\text{ACmax}}$ $\le$ 10.0 r.v. where r.v. is the reference value from Murtada et al. (2016)

Parameter	Description	Value
Geometry
$R_o^{\prime }$ (cm)	Load-free outer radius	0.0110, 0.0126 - assumed
$h_w$ (-)	Load-free thickness-medium radius ratio	0.367 - fitted
${\lambda }_z$ (-)	Axial stretch	1.364 - fitted
$k_{\omega }$ (-)	Circumferential pre-stretch	1.373 - fitted
Passive response
$c_0$ (dyne cm-2)	Material constant	9.1633 · 104 - fitted
$c_1$ (dyne cm-2)	Material constant	3.15 · 104 - from Murtada and Holzapfel (2014)
$c_2$ (-)	Material constant	0.646 - fitted
$\varphi$ (∘)	Fibres orientation angle	0.0 - assumed
Active response
$N_{\text{CF}}$ (cm-2)	Number of CF per unit area	2.44 · 1010 - from Murtada et al. (2016)
$L_{\text{SMC}}$ (cm)	SMC length	0.01 - from Murtada et al. (2016)
$L_{\text{m}}$ (cm)	Myosin filament length	3.0 · 10-5 - from  Murtada et al. (2016)
$u_{\text{PS}}$ (cm)	Average elongation caused by power-stroke	1.424 · 10-6 - fitted
$\frac{k_{\text{XB}}}{{\delta }_{\text{m}}}$ (dyne cm-2)	Cross-bridge elastic stiffness per distance between myosin monomers	8.166777 · 106 - fitted
${\overline{u}}_{\text{fs}}^{\text{opt}(-)}$(-)	Normalized optimal filament sliding	1.490 · 10-2 - fitted
$s_{\text{fo}}$ (cm)	Filament overlap scaling factor	5.870 · 10-7 - fitted
$k_{\text{ACmax}}$ (dyne cm-1)	Actin cortex stiffness scaling factor	1.004 · 101 - fitted
$n_{\text{AC}}$ (-)	Actin cortex activation function coefficient	4.156 - fitted
$K_{\text{AC}}$ (-)	Actin cortex activation function coefficient	10.201 - fitted