title: Changes in plasma enzyme activities in professional racing cyclists.
abstract: OBJECTIVE
  To reports changes in plasma levels in professional racing cyclists.
  
  
  METHODS
  Plasma levels of the intracellular enzymes aspartate aminotransferase, alanine aminotransferase, gamma glutamyl transpeptidase, lactate dehydrogenase, and alkaline phosphatase were measured resting and after exercise in professional cyclists participating in two road races: Vuelta Ciclista a Valencia (800 km, beginning of the cyclist season), and the top rank race Vuelta a España (2700 km, at the end of cyclist season).
  
  
  RESULTS
  A significant increase in plasma aspartate aminotransferase, alanine aminotransferase, and alkaline phosphatase was observed at the end of the race over the corresponding paired start values (P < 0.05). The increase in plasma lactate dehydrogenase after the race was only statistically significant (P < 0.05) in the Vuelta a España. The longer the duration of the cycle tour race, the greater were the increases in aspartate aminotransferase and alanine aminotransferase levels. The high levels returned to their start values during the overnight resting period.
  
  
  CONCLUSIONS
  The presence of these enzymes in the blood is probably due to mechanically damaged muscle cells leaking their contents into the interstitial fluid.
authors.affiliation: Departmento de Fisiología, Facultad de Medicina, Universidad de Extremadura, Badajoz, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Mena
authors.forename: M
authors.initials: M
authors.lastname: Maynar
authors.forename: J E
authors.initials: JE
authors.lastname: Campillo
mesh_terms: D000410:Alanine Transaminase / Q000097:blood; D000469:Alkaline Phosphatase / Q000097:blood; D001219:Aspartate Aminotransferases / Q000097:blood; D001642:Bicycling / Q000502:physiology*; D004798:Enzymes / Q000097:blood*; D006801:Humans; D007770:L-Lactate Dehydrogenase / Q000097:blood; D005723:gamma-Glutamyltransferase / Q000097:blood
chemical_list: D004798:Enzymes; D007770:L-Lactate Dehydrogenase; D005723:gamma-Glutamyltransferase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase; D000469:Alkaline Phosphatase