There are visceral reactions most of us expect during a roller coaster ride: a drop in the gut, a leap of the heart, a tingle in the fingertips.

For some, there may be other feelings, too: a pang in the back, a kick to the lower abdomen, an urgency in the bladder. These are symptoms that often come with passing a kidney stone — an event that may not be entirely unexpected on certain roller coasters, according to a new study.

Image A silicone cast of the inside of a kidney researchers used to study kidney stones and roller coasters. Credit... G.L. Kohuth/Michigan State University

The authors found that moderate-intensity, rattling coasters might be effective at dislodging little kidney stones in the outer ducts of the kidney and propelling them toward the ureter, the tube connecting the kidneys and bladder.