PULL IN OLYMPIC WEIGHTLIFTING

  • 1 January 1979
    • journal article
    • research article
    • Vol. 11  (2) , 131-137
Abstract
Data from 5 experienced weightlifters on the vertical forces applied to the barbell and system (barbell and lifter) during the pull were in excellent agreement with earlier displacement-time descriptions of the double knee bend as consisting of 2 stages of extension interrupted by a period of realignment (2nd knee bend). The vertical component of the ground reaction force (Rz) consisted of 3 phases: Weighting I, Unweighting and Weighting II. The relative magnitude of the Rz impulse with respect to the system weight impulse (as an indicant of the proportion of the Rz impulse contributing to system acceleration) ranged from 118-141% for Weighting I, 74-89% for Unweighting and 122-135% for Weighting II. In agreement with published theoretical calculations the most experienced and successful lifter produced the larger phase of positive acceleration first. The rebending of the knees was associated with the Unweighting phase. Although this latter interval corresponded to a phase of barbell deceleration, the concomitant enhancement of the back, hip and knee extensor activity appeared to outweigh any adverse effects.

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