Cardiac Screening and Cycling: Heart Health Assessment Recommendations for Amateur Riders

Introduction

Every so often, news emerges of an amateur marathon runner or cyclist dying suddenly during an event, sparking widespread discussion. Cycling is a sport with very high aerobic intensity, and it is not uncommon to sustain a heart rate at 70–85% of maximum for extended periods. The strain on the heart is even greater during climbs or interval training. For amateur riders who are older or have potential risk factors, understanding their own heart condition is the foundation for exercising safely.

Epidemiology of Sudden Cardiac Death in Sports

Sudden Cardiac Death (SCD) is defined as non-traumatic death occurring during exercise or within 1 hour after exercise, and is almost 100% caused by cardiac reasons.

• Younger populations (<35 years old): The most common causes are structural heart diseases (such as hypertrophic cardiomyopathy, arrhythmogenic right ventricular cardiomyopathy ARVC)
• Middle-aged and older populations (>35 years old): The most common cause is coronary artery disease (rupture of atherosclerotic plaques)
• The estimated rate of sudden death in amateur marathons/cycling is approximately 1/50,000–1/100,000 participants

Which Amateur Riders Need Cardiac Assessment?

High-Priority Groups (recommended to undergo assessment before participating in moderate-to-high-intensity riding)

• Men aged ≥40 / Women aged ≥50
• Personal history of coronary artery disease, arrhythmia, or cardiomyopathy
• First-degree relatives (parents, siblings) who had a myocardial infarction or sudden death before age 50
• Any one of the “three highs” (hypertension, hyperlipidemia, diabetes) that is uncontrolled
• Long-term smokers (>10 pack-years)
• BMI >30 (obesity)

Immediate Assessment is Required if the Following Symptoms Appear

• Chest tightness, chest pain, or palpitations during or after exercise
• Unexplained syncope (even a brief fainting episode)
• Severe dizziness or dyspnea during exercise (disproportionate to training intensity)
• Sudden abnormality in resting heart rate (marked increase or decrease)

Cardiac Assessment Items and Their Significance

The “Athlete’s Heart” Phenomenon in Cyclists

Long-term high-intensity aerobic training can cause “Athlete’s Heart”—enlargement of the heart chambers, mild thickening of the heart wall, and a decreased resting heart rate (40–50 bpm is normal). This is a physiological adaptation, not pathological, but it may resemble certain heart diseases on an ECG or ultrasound, requiring differential diagnosis by a cardiologist with experience in sports medicine.

Key Points for Differential Diagnosis

• Wall thickening in hypertrophic cardiomyopathy (HCM) is usually >15mm, with a reduced ventricular chamber size
• Wall thickening in athlete’s heart is usually <13mm, with a normal or enlarged ventricular chamber
• After stopping training, the changes in athlete’s heart are reversible within months

Daily Heart Monitoring Tools

Modern wearable devices (smartwatches, heart rate straps) offer unprecedented opportunities for self-monitoring:

1. Resting heart rate trends: If resting heart rate suddenly rises >7–10 bpm without infection, overtraining or cardiac issues should be considered
2. Heart rate variability (HRV): A persistent decline may indicate overtraining or autonomic nervous system imbalance
3. Arrhythmia detection: Some devices can detect atrial fibrillation (AFib); if detected, medical confirmation should be sought

Emergency Response to Cardiac Events During Exercise

• Stop exercising immediately and lay the affected person flat
• Call 119 and obtain an AED
• If there is no breathing or no pulse: start CPR (cardiopulmonary resuscitation) immediately
• AED use should be completed within 3–5 minutes if possible; survival rates decrease by approximately 10% for every minute of delay

Practical Recommendations

• Before participating in major events, consider undergoing a comprehensive cardiac health assessment
• Know your maximum heart rate (220-age is a rough estimate; precise values require testing) and set an upper limit for training heart rate
• In Taiwan, cardiac health assessments have partial coverage under the National Health Insurance (such as ECG); fully self-paid athlete packages range from approximately NT$3,000–8,000

Conclusion

“Screening before exercise” is not meant to stop you from riding, but to give you more confidence to ride farther and longer. Most people will come away from screening with the conclusion “ride with peace of mind”; a minority may discover hidden issues, and early intervention can prevent serious consequences. Heart health is the most worthwhile piece of cycling equipment you can invest in.

Related Reading

• Heart Health in Older Athletes: Cardiac Screening Recommendations and Items Before Exercise
• Cardiac Safety in Cycling: When to Undergo a Stress ECG Examination
• Cardiac Screening for Athletes: Cost-Effectiveness of 12-Lead ECG vs ECG + Ultrasound
• Cycling and Heart Health: The Protective Benefits of Long-Term Riding on the Heart