Earth is the homeworld of the Human race, located in the Sol System. It is the third planet of the system, orbiting at precisely 1 AU from its parent star, a G2-V Main Sequence star known as Sol, or simply The Sun. Contrary to popular belief, Earth is not the Federation's headquarters - it is Mars.
What causes whole body vibration. Drivers of some mobile machines, including certain tractors, fork lift trucks and quarrying or earth-moving machinery, may be exposed to WBV and shocks, which are associated with back pain.
A body that becomes overly stressed (stress-response hyperstimulated) can cause the nervous system to behave erratically, which can cause nerve impulses to fire erratically. Since nerve impulses control muscles, an erratically behaving nervous system can cause muscles to twitch. As long as the nervous system is even slightly overly stressed, it can cause erratic muscle twitching.