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Given the popularity of the topic around the AJAX problems, a brief summary of whole-body vibration (WBV) and why it's a problem. In short and to the surprise of no one, shaking a human rapidly and for a long time is bad, but can also be really bad. 
Perhaps moreso than usual a disclaimer - this is Twitter, I dont have much space and some things are simplified or omitted for simplicity. I'm not a Dr or human factors specialist and this is a hugely complex science, I’m just giving a flavour of the topic. That out of the way...
So, what is WBV? UK Health & Safety Executive are rather interested in it, and define as shown. In essence, something vibrating your whole body, obviously.
As an occupant of any vehicle you are subject to WBV, the frequency and severity of vibrations are v important
As an occupant of any vehicle you are subject to WBV, the frequency and severity of vibrations are v important
