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Figure 1 Echocardiographic and hemodynamic variables. Echocardiographic and hemodynamic variables (n = 48) before and after the race (mean ± SE) (A) Preload represented by left ventricular end diastolic diameter was unchanged (p = 0.19). (B) Ejection fraction decreased significantly after the race (p < 0.001). (C) Heart rate increased significantly after the race (p = 0.05). (D) Afterload represented by mean arterial pressure did not change (p = 0.52). (E) Continuous heart rate tracing from lead competitor. bpm = beats/minute; EF = ejection fraction; HR = heart rate; LVED = left ventricular end-diastolic diameter; MAP = mean arterial pressure.