A six-time Ultraman winner and a normal heart: A case report

Area of Science:

• Sports Medicine
• Cardiology
• Exercise Physiology

Background:

• Increasing participation in high-endurance aerobic exercise training and competitions.
• Potential for cardiac structural changes in athletes undertaking strenuous endurance exercise.
• Need to understand the cardiac implications of extreme exercise volumes.

Purpose of the Study:

• To report a case of an elite endurance athlete with extensive training history.
• To evaluate cardiac structure and function in an individual with exceptionally high aerobic exercise exposure.
• To investigate potential cardiac adaptations or abnormalities in response to extreme endurance training.

Main Methods:

• Case report of a 47-year-old male ultramarathon runner with 35 years of training.
• Accumulated over 50,000 hours of training and competition, averaging 25-30 hours/week.
• Comprehensive cardiac evaluation including electrocardiograms (rest and maximal exercise), transthoracic echocardiogram, and magnetic resonance imaging.

Main Results:

• The athlete had accumulated an exercise volume approximately 25 times the recommended dose for health.
• No major abnormalities were detected in electrocardiograms (rest and maximal exercise).
• Transthoracic echocardiogram and magnetic resonance imaging revealed a normal cardiac structure and function.

Conclusions:

• Extreme volumes of aerobic exercise, even over decades, may not necessarily lead to major cardiac abnormalities in all individuals.
• This case suggests that some elite endurance athletes can tolerate exceptionally high training loads without developing detectable cardiac pathology.
• Further research is warranted to understand the long-term cardiac effects of extreme endurance exercise and individual variability in response.