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Fig. 8. Work loops predicted for the (A) biceps femoris (BF) and (B) vastus
lateralis (VL) during level and incline hopping calculated from muscle stress
(Fig. 7) and mean fascicle
strain. The BF likely does little work during level hopping but produces a
substantial amount of positive work during incline hopping (counter-clockwise
work loop). The VL likely shifts from absorbing a large amount of energy
(negative work) during level hopping to producing a small amount of positive
work on an incline. Estimated work values are in J kg–1
muscle. Circles on the ends of the work loops indicate the beginning of
stance. The scale bar along the x-axis represents 10% fascicle strain
in this direction.
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