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Estimating strength of youth for manual material handling tasks in agriculture using a two-dimensional biomechanical model.

Waters-T; Garg-A
Proceedings of the 17th World Congress on Ergonomics (IEA2009), Beijing, China, August 9-14, 2009. Madison, WI: International Ergonomics Association, 2009 Aug; :1-5
Youth and adolescents are routinely engaged in manual material handling (MMH) tasks that may exceed their strength capability to perform the task and may place them at excessive risk for musculoskeletal disorders. This paper reports on a 2 dimensional biomechanical model that was developed to assess MMH tasks performed by youth 3-21 years of age. The model uses age, gender, posture of the youth performing the MMH activity, and weight of the load handled as input, and provides an estimate of the strength demands of the task and spinal disc compression and shear force resulting from the activity as output. The model can be used to assess whether a specific MMH task exceeds the strength demands for youth of certain ages or genders, which internal muscle strengths are most affected, and provides information about the estimated spinal disc compression and shear forces on the spine as a result of the specified MMH task. These results would be helpful in deciding whether a task is appropriate for a youth to perform or whether a certain task modification may be sufficient in reducing the physical demands to a level acceptable for a youth of certain age and gender.
Ergonomics; Workers; Worker-health; Occupational-health; Occupational-exposure; Manual-lifting; Manual-materials-handling; Agricultural-workers; Musculoskeletal-system-disorders; Computer-models; Age-groups
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Proceedings of the 17th World Congress on Ergonomics (IEA2009), Beijing, China, August 9-14, 2009
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division