Age and Sex Effects on the Active Stiffness of Vastus Intermedius under Isometric Contraction

Table 5

Pearson’s correlation coefficients between VI shear modulus and relative isometric contraction levels in each group and at different knee joint angles.

Knee joint angle	Young male	Young female	Elderly male	Elderly female
90°	0.977	0.974	0.980	0.975
60°	0.971	0.968	0.975	0.979