Permissible loads: biomechanical considerations

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Abstract
Loads imposed on the spine by manual material handling should not be damaging to its structural elements. They should also, of course, be within the physical capabilities of the worker to handle. Current knowledge allows us to predict global loads on the spine from physical activities, but not the precise distribution of these loads. Therefore, general guidelines on permissible loads can be made, but not specific ones valid in all situations. To develop a model of permissible loads work factors such as object weight, location, load symmetry, load acceleration and body posture should be considered along with individual factors such as age, gender and physical capabilities, and time factors such as duration and frequency.

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