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Fig. 4. Mean angular movement of the shoulder, elbow, hip, knee and ankle joint
over one step cycle of all individuals of (A) Tupaia glis and (B)
Galea musteloides, sorted by body mass. Numbers in parentheses
indicate number of steps used. Stance and swing duration were scaled to the
same length by linear interpolation: 0% and 100%=touch-down; 50%=lift-off.
Note how the monophasic angular movement in the shoulder joint in juvenile
tree shrews becomes more and more biphasic during development. The shoulder
joint movement of the underweight tree shrew juvenile P39(2) is similar to
that of younger individuals. Despite this, the angular movement in the
precocial cui is more or less biphasic from birth. Furthermore, note the
increasing synchronization of maximum joint extension during stance.
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