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Left ventricular chamber size predicts the race time of Japanese participants in a 100 km ultramarathon
  1. J Nagashima1,
  2. H Musha2,
  3. H Takada1,
  4. M Murayama1
  1. 1Yokohama Sports Medical Center, Yokohama-city, Japan
  2. 2St Marianna University, Yokohama-city Seibu Hospital, Yokohama-city
  1. Correspondence to:
 Dr Nagashima
 Yokohama Sports Medical Center, Internal Medicine Section, Yokohama-city, Japan; junagashima-circ{at}


Objective: As a subanalysis of an echocardiographic study performed on 291 Japanese participants in a 100 km ultramarathon, to estimate predictors of race time.

Methods: A total of 247 male participants in a 100 km ultramarathon (age 20–73 years) were examined by echocardiography. Correlations between age, body surface area, monthly running distance, or echocardiographic variables and the race time were examined.

Results: According to simple regression analysis, age (r  =  0.299, p<0.0001), monthly running distance (r  =  −0.388, p<0.0001), left ventricular end diastolic diameter (r  =  −0.300, p<0.0001), and left ventricular end systolic diameter (r  =  −0.325, p<0.0001) correlated significantly with the race time. When multiple regression analysis was performed, age (f  =  2.364), monthly running distance (f  =  −0.113), and left ventricular end systolic diameter (f  =  −2.361) remained significant predictors of the race time.

Conclusion: Left ventricular diameter predicts the race time for a 100 km ultramarathon, in addition to age and amount of training.

  • heart
  • diameter
  • marathon
  • echocardiography
  • performance

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  • Competing interests: none declared