Impaired left ventricular systolic function after a half-ironman race

Area of Science:

• Cardiovascular Physiology
• Sports Medicine
• Exercise Science

Background:

• Prolonged strenuous exercise, such as triathlons, places significant demands on the cardiovascular system.
• Understanding the impact of such events on cardiac function is crucial for athlete health and performance monitoring.

Purpose of the Study:

• To evaluate the effects of a half-ironman (HI) race on left ventricular systolic function.
• To assess changes in cardiac contractility and performance metrics following extreme endurance exercise.

Main Methods:

• Nine male triathletes underwent echocardiography before, immediately after, and 24 hours after completing a half-ironman race.
• Measurements included systolic blood pressure, heart rate, and various echocardiographic parameters assessing left ventricular function.

Main Results:

• The HI race led to a decrease in systolic blood pressure and fractional area change, indicating reduced systolic function.
• An increase in heart rate and end-systolic cavity area was observed post-race, suggesting altered ventricular dynamics.
• These changes tended to normalize within 24 hours after the cessation of exercise.

Conclusions:

• Participation in a half-ironman race is associated with transient impairment of left ventricular contractility.
• A temporary decline in left ventricular systolic function occurs post-HI, with recovery observed within 24 hours.