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Research Article  |   March 2000
Effects of Body Mechanics Training on Performance of Repetitive Lifting
Author Affiliations
  • Susan J. Lieber, MS, OTR/L, is Research Associate, Department of Anesthesiology/CCM, Pain Evaluation and Treatment Institute, University of Pittsburgh, 4601 Baum Boulevard, Pittsburgh, Pennsylvania 15213; liebersj@peti.sm.upmc.edu
  • Thomas E. Rudy, PhD, is Professor, Departments of Anesthesiology, Psychiatry, and Biostatistics; Pain Evaluation and Treatment Institute, University of Pittsburgh, Pennsylvania
  • J. Robert Boston, PhD, is Associate Professor, Department of Electrical Engineering, Pain Evaluation and Treatment Institute, University of Pittsburgh, Pennsylvania
Article Information
Complementary/Alternative Approaches / Work and Industry / Physical Disabilities
Research Article   |   March 2000
Effects of Body Mechanics Training on Performance of Repetitive Lifting
American Journal of Occupational Therapy, March/April 2000, Vol. 54, 166-175. doi:10.5014/ajot.54.2.166
American Journal of Occupational Therapy, March/April 2000, Vol. 54, 166-175. doi:10.5014/ajot.54.2.166
Abstract

Objective. To measure the efficacy of body mechanics instruction (BMI) in patients with low back pain.

Method. The effect of BMI was measured in four participants with back injuries using a standardized lifting protocol. Static strength, weight lifted, number of lifts completed, and motion analysis data to describe the body mechanics were measured before and after work hardening to evaluate treatment effects. The participants’ performances were compared with 52 controls from an earlier study.

Results. Starting postures, characterized by degrees of hip and knee flexion, varied by participant but favored a squat lift in three participants when compared with the controls. Dynamic motion synchrony of the hip and knee joints was similar to controls in three of the four participants. Posttest data revealed significant changes in static strength, dynamic endurance, and lifting speed.

Conclusion. Intensive instruction in body mechanics provided during the work-hardening treatment produced major changes in lifting styles, in terms of both starting postures and dynamic aspects of repetitive lifting. The computerized measurement procedures used in this study permitted more careful and detailed analyses of body mechanics, particularly dynamic aspects, than is possible with observational methods. This study demonstrated some of the inherent intricacies in isodynamic lifting and suggests additional areas of performance that may be important to address in BMI.