Whole-body vibration (WBV) is common for operators of many different kinds of vehicles including:
The illustration below shows how various vibration frequencies affect different parts of the body when exposed to WBV.
NIOSH studies show that an ergonomic seat designed using a combination of SunMate and Pudgee reduced the frequency level in a mining shuttle car from 15Hz to 4Hz.
Source: HSA Bulletin, April 1998