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*Christine Boyd Stopka is an associate professor in the Dept. of Exercise and Sport Sciences at the University of Florida and is also director of the exercise therapy laboratory.
*Kimberly L. Zambito, a graduate assistant who helped update this article, now attends medical school at the Medical College of Pennsylvania in Philadelphia.
This article has been updated and is reprinted with permission from the Journal of Athletic Training, official publication of the NATA. It was originally published in 1980, Vol. 15(1), pp. 20-25.
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