Coefficients of the multivariate linear regression analysis for the dependent variables: Maximum contraction amplitude (), time of re-lengthening (τsl) and maximum strain rate ().

The independent variables included in the analysis were: , [Ca2+] transient amplitude; τfall, time constant of [Ca2+] transient decay; E, Young’s Modulus; fmax, the maximal tension delivered by the sarcomere; εopt, the optimal deformation at the maximal activation state; s, the sensitivity to the actin-myosin overlap.