I just read an article in the New York Times from April 5, 2011 citing guidelines on signs and symptoms of young athletes developing overuse injuries. The information can be found on www.journalof athletictraining.org by using search terms “pediatric overuse injuries”. It lists the signs of overuse injuries in youths.  With the year round commitments to a single sport this is one of more glaring factors contributing to this problem.  Young athletes are not having modified rest or cross training in the form of another sport.  The same movements are being performed every week sometimes everyday for a series of years as a child is still developing.