KINETICS: FORCES AND MOMENTS OF FORCE - Biomechanics and Motor Control of Human Movement - page 137

kinematic data plus data listed in Table A.5 b . Discuss your answer
in terms of hip muscle activity during late swing.
(c) Repeat Problem 4 b for frame 30. Discuss your answer in terms of the
role of hip muscles during early weight acceptance.
5. (a) Calculate and plot the support moment for the total lower limb during
stance (every second frame commencing with frame 28). The sup-
port moment M s is the total extensor pattern at all three joints and
M s =− M h . Note that the negative sign for M a and M h

is introduced to make the clockwise extensor moments at those two
joints positive, and vice versa when the moments are flexor. Discuss
total lower limb synergy as seen in this total limb pattern.
(b) Scan the polarity and magnitude of the ankle moments during the
entire stride, commencing at heel contact right (HCR) (frame 28) and
proceeding to the next HCR (frame 97), and describe the function of
the ankle muscles over the stride period.
(c) Repeat Problem 5 b for the knee moments.
(d) Repeat Problem 5 b for the hip moments.

M a + M k −

5.5 REFERENCES

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