title: Effects of knee surgery on cardiac function in soccer players.
abstract: OBJECTIVE
  To evaluate the effects of knee surgery on hematocrit and hemoglobin concentration and on resting cardiac parameters as measured by echocardiography.
  
  
  METHODS
  Ten soccer players who underwent knee surgery were evaluated before (T1) and after (T2) hospitalization within a 7-day interval.
  
  
  RESULTS
  After hospitalization, end diastolic volume and stroke volume were significantly reduced (P < 0.05) by 14 and 22%, respectively. Despite a significant increase in resting heart rate (T1: 68 +/- 3.3 beats/ min, T2: 72 +/- 3.1 beats/min, P < 0.05), cardiac output was significantly decreased (T1: 4.89 +/- 0.56 liters/min; 3.95 +/- 0.62 liters/min, P < 0.05). The ejection fraction was 65% at T1 and fell to 58% at T2 (P < 0.05). After hospitalization, significant decreases in hemoglobin concentration and hematocrit were observed, suggesting a fall in blood volume.
  
  
  CONCLUSIONS
  In soccer players, knee surgery leads to resting cardiac deconditioning, which is characterized by a significant reduction in stroke volume.
authors.affiliation: Polyclinique de Riaumont, Liévin, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Olivier
authors.forename: Renaud
authors.initials: R
authors.lastname: Legrand
authors.forename: Jacques
authors.initials: J
authors.lastname: Rogez
authors.forename: Serge
authors.initials: S
authors.lastname: Berthoin
authors.forename: Thierry
authors.initials: T
authors.lastname: Weissland
mesh_terms: D000328:Adult; D002318:Cardiovascular Diseases / Q000000981:diagnostic imaging / Q000209:etiology*; D003971:Diastole; D006339:Heart Rate; D006400:Hematocrit; D006454:Hemoglobins; D006801:Humans; D007718:Knee Injuries / Q000150:complications / Q000601:surgery*; D008297:Male; D011446:Prospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D012916:Soccer / Q000293:injuries*; D013318:Stroke Volume; D013997:Time Factors; D014463:Ultrasonography
chemical_list: D006454:Hemoglobins