My 15 year old son, who is athletic and physically fit, ran track last Wednesday and felt faint and said his legs and arms were numb. He has not seemed to recover well. He played a baseball game Thursday and practiced Friday. He complained all weekend of leg/ muscle aches, and his calves were tender to the touch. We made sure to get him very hydrated over the weekend and Monday. Monday evening, he ran 1 mile in a track meet and when it was over, he could barely walk, vomitted, and was unusually tired and achy. His pediatrician tested his urine today (normal) and had his CPK level tested. His level was 1700. The doctor does not want him to play baseball tomorrow and do nothing but sit and rest all day and retest his CPK on Friday. My question: Why does he need to sit out tomorrow s game? What is the danger of an elevated CPK level? What are the treatments?