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Fig. 7. Graphs of the angular changes of two joints of a hind leg during a jump by
Aphrodes. The trochanter was progressively depressed about the coxa
and the tibia extended about the femur. The first depression movement of the
trochanter (left yellow bar) began at –2.75 ms before take-off (right
yellow bar). The body–trochanteral angle (blue lines and triangles) was
measured as the angle of the femur against the longitudinal axis of the body
and therefore includes any changes in the angle between the trochanter and
femur (see inset photograph and drawing). These are likely to be small
relative to the changes at the coxo-trochanteral joint. The femoro-tibial
angle is represented by red lines and squares and the body by black lines.
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