Analysis and Quantitative Myoelectric Measurements of Loads on the Lumbar Spine when Holding Weights in Standing Postures

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Abstract
Ten subjects executed a number of weight-holding and force-resisting work tasks while standing either upright or with their trunks in 30.degree. of forward flexion. All tasks involved sagittally symmetric body configurations and were performed isometrically. A simple calculation scheme was devised to predict the lumbar trunk muscle contraction forces and the lumbar spine compression forces required for execution of each task. The myoelectric activity was recorded quantitatively at 8 sites over the lumbar trunk muscles and at 4 sites over the abdominal muscles. Good correlation was found between the predicted muscle contraction forces and the myoelectric activities.