The study, which appears in the Journal of the American Osteopathic Association, was inspired by anecdotal reports about people passing their kidney stones after enjoying a spin on the Magic Kingdom’s Big Thunder Mountain Railroad. One man even claimed to have gone on the roller coaster three times in a row, passing one stone after each ride. [...]
Amazingly, they found that stones placed in the kidney’s upper passage were dislodged on all 20 rides, although those in the lower passageways were somewhat more stubborn. They also found that sitting at the back of the ride led to a passage rate of just under two in three, while sitting at the front caused a passage rate of one in six. [...]
Large stones normally have to be surgically removed, although smaller stones are sometimes spontaneously passed out of the body in urine. In their study, the researchers found that riding on roller coasters can increase the likelihood of these smaller stones passing without the need for any intervention, thereby preventing the build-up of large stones.
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