Kinesiology 3550A/B Lecture Notes - Lecture 3: Human Musculoskeletal System, Shear Force, Pascal (Unit)
16 Oct 2017
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Document Summary
Biomechanical load tolerance and risk: a fundamental concept in the application of occupational biomechanics to ergonomics is that one should design workplaces so that the load imposed upon a structure does not exceed tolerance of the structure. Muscle and tendon tolerance: the muscle is the structure within the musculoskeletal system that has the lowest tolerance, the ultimate strength of a muscle has been estimated to be 33mpa. It is believed that the muscle will rupture prior to (healthy) tendon since tendon stress has been estimated to be between 60 and 100 mpa. Bone tolerance: the ultimate stress of bone depends upon the direction of loading, bone tolerance can range from, 133 mpa in longitudinal tension to 193 mpa in longitudinal compression, 68 mpa in shear. Ligament tolerance ligament stress has been estimated to be approximately 20 mpa. However, ligament properties vary greatly depending on their location within the body: a strong temporal component to ligament recovery has been identified.
