You're supposed to puke when "Jim-n-the boy's" suffer violent impact, natures way of teaching you to cover them at all costs :whoa: .
Myself, and many others on this site have had a sudden deceleration 'thing'. Puking, feel like doo-doo, don't want to look at a bike for a day or two. Happens to the Pro's in AMA events, always called "Stomach Flu".
I can't explain it, but at most I'll hazard a guess that a shock to the brainpan can come from any part of the body and it don't take much to rattle your cage, so to speak.
Maybe Nephron will weigh in with real facts instead of my ignorant ramblings :cool: