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

Figure 5

The gender effects on the mean VI shear modulus at different relative isometric contraction levels (% MVC) between subjects with similar age range. Comparisons were made between young male and female subjects at (a) 90° and (b) 60° knee joint angles, and between elderly male and female subjects at (c) 90° and (d) 60° knee joint angles.

(a)

(b)

(c)

(d)