NYT: 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.

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.

Their report, published last week in The Journal of the American Osteopathic Association, suggests that riding these roller coasters might help patients who have kidney stones that are five millimeters or less in diameter.