Figure 3. Relationship between shear elastic modulus and elbow joint angle for both heads of biceps brachii.

Shear elastic modulus (kPa) was obtained for all participants using supersonic shear imaging during passive loading cycles performed between 20° and 120° of elbow flexion (0° represents full extension). The change of shear elastic modulus for both the short head (mean values in black circles and standard deviation in black lines) and the long head (mean values in open circles and standard deviation in gray) of biceps brachii is represented.