The influence of muscle forces on musculoskeletal system loads during lifting – pilot study

Abstract

Present study tries to determine the effect of considering the muscles on the results of loads on the musculoskeletal system, for two basic techniques of lifting the object: stoop and squat. The trials were carried out for 5 selected positions of each technique, using AnyBody software and a verified model. Reactions in the intervertebral disc L5S1 and knee joint as well as the sum of squares of muscle forces were investigated. The obtained results confirm that the results of loads on the musculoskeletal system are an order of magnitude larger for models considering muscle forces. These studies are the introduction to a broader analysis of the problem of the influence of muscle forces on the loads of individual joints during lifting.