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Abstract This study investigated the muscular torques and joint forces during the parallel squat, as performed by some of the best national and world-class powerlifters. Cinematographic analysis of 12 competitors in the U.S. Senior National A.A.U. Powerlifting Championships provided continuous measurements of joint and bar centers. These data were used in dynamic equations of motion to obtain vertical and horizontal joint forces and muscular torques for the shank, thigh, and trunk. Prior to analysis, subjects were further classified into three groups according to skill shown in performing the parallel squat. Results indicated that high-skilled subjects minimized trunk torques by maintaining a more erect trunk position and also demonstrated more extensor-dominant thigh torques. It was also found that quasistatic or static treatments of the parallel squat provide results within 10% of the dynamic equations of motion.
McLaughlin et al. (Mon,) studied this question.