When one of the assumptions of the Niosh Lifting guide is violated, what tool do you use? In this case, a client is lifting an unstable load. I have done a quick literature search, but don’t see any alternative for an unstable. I think the numbers would be "worse" with an unstable load, so the Lifting Guide would give a best case scenario. What do you think?
You could run the numbers using NIOSH and explain in the description of the results that because the load is unstable, it’s actually worse. Another tool I use if I cannot use NIOSH is the University of Michigan 3DSSPP biomechanical model, but I know this tool is not necessarily readily available to folks unless you purchase a license.
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