Table 2.

SHR model parameters (mean ± SE) obtained from the data fitting process with $\mathit{\psi }[0^{\circ },{90}^{\circ }]$

Group	$(1-\mathit{\varphi })\mathit{\mu }(\mathrm{kPa})$	$\mathit{\varphi }E(\mathrm{GPa})$	${}^{(\#\mathrm{ai})}{\mathit{\theta }}_o{(}^{\circ })$	${}^{(\ast \mathrm{a},\ast \mathrm{i},\ast \mathrm{ai})}\mathit{\psi }{(}^{\mathrm{o}})$	$R^2$
Mature
Ctl	$0.98\pm 0.37$	$8.43\pm 0.34$	$14.6\pm 4.6$	$50.2\pm 1.6$	$0.986\pm 0.002$
3 weeks	$0.48\pm 0.13$	$7.27\pm 0.98$	$11.9\pm 1.9$	$53.0\pm 0.5$	$0.988\pm 0.006$
6 weeks	$0.71\pm 0.14$	$7.32\pm 0.96$	$10.0\pm 1.5$	$52.9\pm 0.5$	$0.994\pm 0.001$
Aging
Ctl	$0.79\pm 0.16$	$9.97\pm 0.77$	$10.8\pm 1.4$	$52.7\pm 0.4$	$0.989\pm 0.002$
3 weeks	$0.64\pm 0.12$	$9.10\pm 1.03$	$13.3\pm 1.8$	$52.2\pm 0.5$	$0.993\pm 0.001$
6 weeks	$1.51\pm 0.61$	$7.31\pm 0.83$	$8.8\pm 1.0$	$53.3\pm 0.3$	$0.994\pm 0.001$
Aged
Ctl	$0.85\pm 0.14$	$8.85\pm 0.63$	$9.8\pm 1.5$	$53.0\pm 0.5$	$0.990\pm 0.002$
3 weeks	$4.22\pm 3.70$	$8.91\pm 1.23$	$8.4\pm 1.2$	$54.5\pm 0.2$	$0.995\pm 0.001$
6 weeks	$0.86\pm 0.16$	$8.86\pm 1.22$	$13.8\pm 2.5$	$52.6\pm 0.7$	$0.995\pm 0.001$

${}^{\ast \mathrm{a}}$Significance with age ($p<0.05$); ${}^{\ast \mathrm{i}}$significance with injury ($p<0.05$); ${}^{\ast \mathrm{ai}}$significant age–injury interaction ($p<0.05$); ${}^{\#\mathrm{ai}}$trend in age–injury interaction ($p<0.1$)