title: [The dynamic change of serum CK, CK-MB and myocardium histomorphology after exhausted exercise in rats].
abstract: OBJECTIVE
  To study the dynamic changes of serum CK, CK-MB and myocardium histomorphology in different time periods after single bout and repeated exhausted exercise in rats.
  
  
  METHODS
  The animal models of myocardial injury were established by exhausted swimming. Creatine kinase (CK), creatine kinase mass (CK-MB) activities in serum were measured immediately at 3, 6, 12, 24, 48 and 96 hours after exhausted exercise, and the dynamic changes of myocardial histopathology were examined.
  
  
  RESULTS
  The CK, CK-MB activities were significantly increased immediately at 3, 6, 12 hours and peaked at 6 hours after single bout of exhausted exercise, meantime the degree of inflammatory cell infiltrate and strong acidophil staining were gradually increased in myocardium of rat, and the myocardial injury was most severe at 12 hours. After 1-week consecutive daily exhausted swimming, CK, CK-MB in serum were obviously increased immediately at, 3, 6, 12, 48 and 96 hours postexercise and peaked immediately and at 96 hours respectively postexercise. There were different degrees of myocardial injury in different time of recovery phase, and was most severe at 48 hours postexercise.
  
  
  CONCLUSIONS
  The myocardial injury was induced by excessive exercise and/or exhausted exercise, and the resulting delayed-onset myocardial injury was further certified.
authors.affiliation: Institute of Materia Medica, Shandong Academy of Medical Sciences, Key Laboratory for Modem Medicine and Technology of Shandong Province, Jinan 250062, China. wangfuwww@tom.com
authors.forename: Fu-Wen
authors.initials: FW
authors.lastname: Wang
authors.forename: Jing-Guo
authors.initials: JG
authors.lastname: Zhao
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: Zhi-Li
authors.initials: ZL
authors.lastname: Hu
mesh_terms: D000818:Animals; D003402:Creatine Kinase / Q000097:blood*; D052279:Creatine Kinase, MB Form / Q000097:blood*; D005221:Fatigue / Q000097:blood*; D008297:Male; D009206:Myocardium / Q000473:pathology*; D005082:Physical Exertion / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D013550:Swimming / Q000502:physiology
chemical_list: D003402:Creatine Kinase; D052279:Creatine Kinase, MB Form