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Fig. 7. During the first 40% of contact (when the total power is primarily
negative), the mean horizontal velocity of the tuber coxae increased and the
mean vertical velocity changed from negative to approximately 0. The resultant
velocity remains essentially constant (the same value at the beginning and end
of the time period) during the first 40% of contact. During the last 60% of
contact, the horizontal velocity remains essentially constant until near the
end, and the vertical velocity substantially increases; thus, the resultant
velocity increases almost continuously over the final 60% of contact. 40% of
contact is indicated by the vertical line. Velocity values represent the mean
across all trials.