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Cardiac considerations in the triathlete.

Publication ,  Journal Article
Douglas, PS
Published in: Med Sci Sports Exerc
October 1989

The cardiac adaptation to exercise training produces a variety of adaptations in cardiac size, shape, and function. To further define these changes and to investigate the effects of maximal conditioning, we studied ultraendurance triathletes training for the Hawaii Ironman Triathlon using echocardiography, Doppler ultrasound, and electrocardiography. In this population, the left ventricle (LV) was of normal size but had increased wall thickness and mass. Systolic function was normal and diastolic function was normal or supernormal (increased ratio of rapid to atrial LV filling velocities). The finding of a pattern of concentric hypertrophy was reinforced by a close relationship between submaximal exercise systolic blood pressure and LV mass (r = 0.88). Examination of valvular function by Doppler ultrasound revealed significantly increased prevalences of mitral and tricuspid regurgitation in athletes, with 91% of athletes (vs 38% of controls) having regurgitation detected in at least one cardiac valve. Analysis of athletes using standard electrocardiographic criteria for the detection of left ventricular hypertrophy showed that these criteria did not reliably detect increased mass. However, changes such as marked QRS prolongation and nonvoltage criteria for LV hypertrophy and RV hypertrophy may be useful in separating physiologic from pathologic hypertrophy. Our studies provide additional descriptions of cardiac changes produced by ultraendurance exercise training and suggest that the hemodynamic load imposed by exercise may be a contributing cause to physiologic hypertrophy. Much yet remains to be learned about the cardiac adaptation to exercise training.

Duke Scholars

Published In

Med Sci Sports Exerc

ISSN

0195-9131

Publication Date

October 1989

Volume

21

Issue

5 Suppl

Start / End Page

S214 / S218

Location

United States

Related Subject Headings

  • Ventricular Function
  • Ultrasonography
  • Swimming
  • Sport Sciences
  • Running
  • Physical Endurance
  • Physical Education and Training
  • Middle Aged
  • Male
  • Humans
 

Citation

APA
Chicago
ICMJE
MLA
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Douglas, P. S. (1989). Cardiac considerations in the triathlete. Med Sci Sports Exerc, 21(5 Suppl), S214–S218.
Douglas, P. S. “Cardiac considerations in the triathlete.Med Sci Sports Exerc 21, no. 5 Suppl (October 1989): S214–18.
Douglas PS. Cardiac considerations in the triathlete. Med Sci Sports Exerc. 1989 Oct;21(5 Suppl):S214–8.
Douglas, P. S. “Cardiac considerations in the triathlete.Med Sci Sports Exerc, vol. 21, no. 5 Suppl, Oct. 1989, pp. S214–18.
Douglas PS. Cardiac considerations in the triathlete. Med Sci Sports Exerc. 1989 Oct;21(5 Suppl):S214–S218.

Published In

Med Sci Sports Exerc

ISSN

0195-9131

Publication Date

October 1989

Volume

21

Issue

5 Suppl

Start / End Page

S214 / S218

Location

United States

Related Subject Headings

  • Ventricular Function
  • Ultrasonography
  • Swimming
  • Sport Sciences
  • Running
  • Physical Endurance
  • Physical Education and Training
  • Middle Aged
  • Male
  • Humans