Figure 8. Muscle stiffness for the shortening and isometric reference contractions.
A, in protocol 1, muscle stiffness decreased with increases in the magnitude of shortening (*P < 0.05). B, in protocol 2, muscle stiffness was smaller for the shortening test contractions than for the isometric reference contractions (*P < 0.05), but the speed of shortening did not significantly affect muscle stiffness.