Fig. 11. The sensitivity of jumping performance to variations in the magnitudes of
the iliosacral extensor torque and the hindlimb torques examined using model
4. The torque pattern in Fig. 9
was used to drive the forward dynamics, and individual torques were scaled in
amplitude by a factor of 0.80-1.20. HR, hip external rotation torque; HA, hip
adduction torque; HE, hip extensor torque; KE, knee extensor torque; AE, ankle
extensor torque; IE, iliosacral extensor torque. The take-off angle
(trajectory of the center of mass, COM) was most sensitive to variations in
the amplitude of the hip external rotation torque (i.e. the range of take-off
angles was largest when HR was scaled from 0.80 to 1.20 of its base value).
The horizontal velocity VH was most sensitive to
variations in the hip extensor torque. The vertical velocity
VV was most sensitive to variations in the hip external
rotation torque and the knee extensor torque.
