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Time course of changes in muscle spindle discharge during the dynamic test for (A) hold-short compared with hold-intermediate and (B) hold-long compared with hold-intermediate. The x-axis is normalized to the maximal actuation used for each spindle based on the displacement that loaded the spine to 35 to 45% of body weight (see methods). 100% ranged between 1.1 and 2.2 mm for the 30 cats. MF, mean frequency.
