Cardiac MRI reference values for athletes and nonathletes corrected for body surface area, training hours/week and sex

 

Male sex, body surface area, and training hours/week increase ventricular volume and wall mass. In elite athletes, short-axis RV diameter exceeded 50 mm in 49/16% (men/women), and LV diameter exceeded 60 mm in 55/16% (men/women). Interventricular septal-wall thickness was 13-15 mm in 5% regular and 15% elite male athletes.

CONCLUSION  
Cardiac MRI reference values show increased ventricular volumes, diameters, wall mass, and wall thickness for endurance athletes compared with nonathletes. High training hours/week and male sex result in an increased overlap with standard thresholds for cardiomyopathy. To help prevent inconclusive reports, the 95th percentile reference values can be used as an alternative to standard upper limits used for the general population.

 

OBJECTIVES 
To establish cardiac MRI reference values for endurance athletes and nonathletes, and study the impact of variables related to ventricular volumes and wall-mass.

METHODS  
Three hundred and thirty-six prospectively recruited healthy individuals aged 18-39 years (mean age 26+/-6 years, 46% women) underwent cardiac MRI: 79 elite athletes (exercising >18 h/week), 143 regular athletes (9-18 h/week), and 114 matched nonathletes (< or =3 h/week).

RESULTS  
Body surface area corrected right (RV) and left ventricular (LV) end-diastolic volume (EDV ml/m2) and wall mass (g/m2) were significantly higher (P<0.0005) in regular/elite athletes than in non-athletes (see recalculated values in the table below)