Sex-Specific 3D Echocardiographic Reference Values for Recreational Athlete’s Heart by VO₂peak

Overview

This study establishes sex- and fitness-specific three-dimensional echocardiographic reference values for the recreational athlete’s heart based on VO₂peak. It demonstrates that higher fitness levels correlate with larger cardiac chamber volumes and increased left ventricular mass in both sexes, with men exhibiting greater remodeling than women at equivalent fitness.

Background

Regular exercise induces cardiovascular adaptations, including the athlete’s heart characterized by balanced, eccentric enlargement of all heart chambers. Differentiating physiological exercise-induced cardiac enlargement from pathological conditions remains challenging, especially in recreational athletes with varying fitness levels. VO₂peak is an objective measure of aerobic fitness that correlates with cardiac dimensions and mass. Advances in three-dimensional echocardiography enable detailed assessment of cardiac structure and function, yet fitness- and sex-specific reference values for recreational athletes are lacking.

Data Highlights

Key Findings

• Recreational athletes with higher VO₂peak exhibit increased left ventricular, right ventricular, and left atrial volumes in both sexes.
• Left ventricular mass increases with fitness level, while the LV mass/volume ratio decreases slightly, indicating balanced eccentric cardiac remodeling.
• Ratios of LV to RV volume (~1.1) and LV to LA volume (~2.8–2.9) remain stable across fitness levels and sexes.
• Men demonstrate greater cardiac remodeling than women at the same VO₂peak, despite similar trends in volume increases.
• Ejection fraction values remain unchanged across fitness levels, suggesting preserved systolic function.

Clinical Implications

These sex- and fitness-specific 3D echocardiographic reference values aid clinicians in distinguishing physiological cardiac adaptations in recreational athletes from pathological enlargement. Incorporating VO₂peak measurements enhances assessment accuracy by contextualizing cardiac size and function relative to aerobic fitness. This approach supports more precise cardiovascular screening and monitoring in physically active populations.

Conclusion

This study provides comprehensive sex- and fitness-specific 3DE reference values for the recreational athlete’s heart, bridging the gap between untrained individuals and elite athletes. The findings facilitate improved differentiation of physiological adaptations from cardiac pathology in clinical practice.

References

1. Original Study 2024 -- Sex-Specific Three-Dimensional Echocardiographic Reference Values for the Recreational Athlete's Heart in Relation to VO₂peak Fitness Levels