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Fig. 6. Representative angular velocity (red line) and angular acceleration (blue
line) for the arm at the shoulder, overlaid on normalized anterior and
posterior deltoid activity, during (A) walking at 1.5 m s–1
and (B) running at 3.0 m s–1. Deltoid activity is processed
and shown as in Fig. 5. Periods
of apparent eccentric contraction are indicated (red arrows), as are periods
in which shoulder acceleration is in opposition to prevailing muscle activity
(blue arrows) or occurs without substantial deltoid activity (black arrows).
Not all such periods are indicated.
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