Clinical Scorecard: Sex-Specific Three-Dimensional Echocardiographic Reference Values for the Recreational Athlete's Heart in Relation to VO₂peak Fitness Levels

At a Glance

Key Highlights

• Three-dimensional echocardiographic (3DE) reference values for left and right heart volumes, mass, and function were established across low, moderate, and high fitness levels based on V̇O₂peak.
• Both sexes showed increased heart chamber volumes and left ventricular mass with higher fitness, but women exhibited less pronounced exercise-induced cardiac enlargement than men at comparable V̇O₂peak.
• Ratios of heart chamber volumes (LV/RV, LV/LA) remained stable across fitness levels, while LV mass/volume ratio decreased slightly, indicating balanced eccentric cardiac remodeling.

Guideline-Based Recommendations

Diagnosis

• Use V̇O₂peak as an objective measure of aerobic fitness to contextualize cardiac size and function in recreational athletes.
• Apply sex- and fitness-specific 3DE reference values to distinguish physiological athlete’s heart adaptations from pathological cardiac enlargement.
• Consider factors such as sex, body size, age, and fitness level when interpreting echocardiographic findings to avoid misclassification.

Management

• Monitor recreational athletes with echocardiography using established fitness- and sex-specific reference values to guide clinical decision-making.
• Recognize that physiological cardiac enlargement in recreational athletes is typically balanced and eccentric without functional impairment.
• Avoid unnecessary interventions by differentiating physiological adaptations from cardiomyopathies using comprehensive assessment including 3DE and exercise testing.

Monitoring & Follow-up

• Regular cardiovascular screening including 3DE echocardiography and cardiopulmonary exercise testing (V̇O₂peak) in recreational athletes to track cardiac adaptations over time.
• Monitor changes in LV mass/volume ratio and chamber volumes relative to fitness progression to identify deviations from physiological remodeling.
• Use stable volume ratios (LV/RV, LV/LA) as markers to assess balanced cardiac remodeling during follow-up.

Risks

• Potential overlap exists between physiological athlete’s heart enlargement and early pathological cardiac conditions, necessitating careful evaluation.
• Misinterpretation of exercise-induced cardiac enlargement as pathology may lead to unnecessary restrictions or interventions.
• Sex differences in remodeling magnitude require tailored interpretation to avoid under- or over-diagnosis in female athletes.

Patient & Prescribing Data

Young healthy recreational athletes aged 18–35 years with varying fitness levels

No pharmacological treatment indicated; management focuses on accurate diagnosis and monitoring of physiological cardiac adaptations relative to fitness and sex.

Clinical Best Practices

• Incorporate V̇O₂peak measurement alongside 3DE echocardiography for comprehensive assessment of the recreational athlete’s heart.
• Use sex-specific and fitness-level-specific 3DE reference values to improve diagnostic accuracy and differentiation from cardiac pathology.
• Recognize the continuum of cardiac adaptations from untrained to elite athletes and apply this understanding in clinical evaluation.
• Maintain awareness of stable chamber volume ratios and decreasing LV mass/volume ratio as hallmarks of physiological remodeling.
• Employ advanced imaging techniques such as automated 3DE and speckle tracking echocardiography to enhance differentiation between physiological and pathological changes.

References

• Original Study on Sex-Specific 3DE Reference Values in Recreational Athletes
• Guidelines on Differentiating Athlete’s Heart from Cardiomyopathies
• Role of V̇O₂peak in Cardiac Adaptation Assessment