When the researchers sat in the front of the roller coaster, however, the stones passed only about 17 percent of the time, the researchers found.
When the researchers were seated in the rear car of the roller coaster, the kidney stones, regardless of their size or location in the kidney, passed nearly 64 percent of the time, according to the study.
Indeed, "seat assignment on the roller coaster was random and determined as a function of place in the waiting line," they wrote.īut seat assignment turned out to be important. The researchers noted that one aspect of the experiment that they could not control was where they sat on the roller coaster. Ultimately, each stone was placed in each location of the kidney for at least one ride. On one ride, for example, the largest stone was placed in the upper part of the kidney on another, the large stone was placed in the middle of the kidney. They experimented with the position of the different sizes of kidney stones in different parts of their kidney model. The researchers took the model kidney on the Big Thunder Mountain Railroad roller coaster 20 times. The kidney stones were different sizes: small (4.5 cubic millimeters), medium (13.5 cubic mm) and large (64.6 cubic mm). In the experiment, the researchers placed three real kidney stones and some urine in the model kidney. To test the effects of riding a roller coaster with kidney stones, they created a 3D model of a kidney that could be taken along for the ride (concealed in a backpack, of course).
And if you're interested in saving, there's no better list than our 53 Ways to Save on your Disney trip from start to finish.Studying this phenomenon required a bit of ingenuity from the researchers.
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