Electrocardiographic changes during exercise in asymptomatic men: 3-year follow-up

Area of Science:

• Cardiology
• Preventive Medicine
• Exercise Physiology

Background:

• Maximal exercise electrocardiography (ECG) is a common tool for assessing cardiovascular health.
• Coronary heart disease (CHD) remains a leading cause of mortality worldwide.
• Identifying individuals at risk for CHD is crucial for timely intervention.

Purpose of the Study:

• To investigate the relationship between exercise-induced electrocardiographic (ECG) changes and the development of coronary heart disease (CHD).
• To assess the predictive value of exercise ECG abnormalities for future CHD events.
• To explore the association between baseline risk factors and exercise ECG findings in relation to CHD incidence.

Main Methods:

• A prospective study involving 510 male civic employees.
• Initial maximal bicycle exercise testing with electrocardiographic (ECG) monitoring.
• Follow-up for 3 years to ascertain clinical CHD development.
• Assessment of traditional CHD risk factors.

Main Results:

• An ischemic exercise ECG was associated with a significantly higher incidence of clinical CHD (24.6%) compared to a normal exercise ECG (2.4%).
• Angina was the most frequent clinical manifestation in subjects with ischemic exercise ECGs, while infarction was more common in those with normal initial ECGs.
• Poor exercise capacity in individuals with abnormal initial exercise ECGs was linked to a higher likelihood of developing CHD.
• Subjects who developed subsequent clinical CHD or had persistently abnormal ECGs after 3 years tended to have more risk factors.

Conclusions:

• Exercise-induced ECG changes during maximal exercise testing are valuable indicators of CHD risk.
• A normal exercise ECG does not exclude the presence of significant underlying CHD.
• The presence of risk factors and reduced exercise capacity modify the prognostic significance of exercise ECG findings.