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Introduction: The ironman (IM) triathlon consists of a 3.8km swimming, 180.2km cycling, and a 42.2km run. Thus IM triathletes (ATHL) are the prototype of ultra endurance athletes. There are limited data on prediction of race time by echocardiographic findings (echo) and antropometric measures.Methods: Thirty-four IM ATHL were screened the day prior to the IM race. Percent body fat (PBF) and skeletal muscle mass (SMM) were calculated as previously described. In all ATHL, a complete echo was performed before the IM triathlon. Findings were correlated.Results: The average age was 38 ± 9 years (6 females). Resting heart rate was 54 ± 7 beats per minute. Body mass index was 22.6 ± 2 g/m2. PBF was only 15.3±5.5%; the hematocrit was 43±2 %; SMM was 39±6 kg. By echocardiography, left ventricular (LV) ejection fraction was 62±6%, LV enddiastolic volume index 69±14ml/m2 and LV muscle mass index 99±25g/m2. The IM total race time was 660±28min.Univariate predictors (Spearman correlation) of IM total race time, LV muscle mass index and left ventricular end-diastolic volume index are shown in the Table. P values are shown in the column.Conclusion: In IM ATHL, performance as measured by total race time is best predicted by PBF and left ventricular muscle mass index; and partially predicted by LVEDVI. Left ventricular changes compatible with athlete's heart can not be predicted by age, amount of training (hours per week) and years of experience but correlate best with the percentage of body fat and the skeletal muscle mass.