Objectives: To investigate the influence of anthropometric parameters on race performance in ultra-endurance triathletes. Design: Descriptive field study. Setting: The Triple Iron Triathlon Germany 2006 in Lensahn over 11.6 km swimming, 540 km cycling and 126.6 km running. Subjects: 17 male Caucasian triathletes (mean (SD) 39.2 (7.5) years, 80.7 (8.9) kg, 178 (5) cm,BMI 25.4 (2.4) kg/m2). Interventions: None. Main outcome measurements: Determination of body mass, body height, skin fold thicknesses, circumferences of extremities, as well as calculation of body mass index (BMI), skeletal muscle mass (SM), per cent SM (%SM) and per cent body fat (%BF) in order to correlate measured and calculated anthropometric parameters with race performance. Results: Body mass, body height, skin fold thicknesses, circumferences of extremities, BMI, %SM and %BF had no effect (p.0.05) on race performance. No significant correlation (p.0.05) was observed between total race time and any of the directly measured and calculated anthropometric properties. A significant correlation (p,0.05) was observed between total race time and both running time (r2=0.87) and cycling time (r2=0.62). In contrast, no significant correlation (p.0.05) was shown between swimming time and total race time. Conclusions: There is no significant association between anthropometric parameters and race performance in ultraendurance triathletes. Running performance rather than cycling performance seems to be the most important factor in order to be successful in a Triple Iron Triathlon. Swimming performance seems to be of low importance.
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