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Index finger force and position as a function of time during contractions. (A) Shortening, (B) isometric and (C) lengthening contractions. For all three conditions, finger force (red line) was held nearly constant as the finger was concentrically abducted (shortening contraction) 15 mm, held in place (isometric contraction), or eccentrically adducted (lengthening contraction) 15 mm.
