Introduction: Myocardial work may provide a different perspective on LV function and energy consumption. Its non-invasive assessment by echocardiography correlates with invasive measures and there are normal values established in adult patients. We aimed to establish normal values in a healthy adolescent population. Methods: Nineteen healthy subjects (mean age = 15 ± 2 years, 42% male) with normal echocardiograms were prospectively included. Brachial cuff blood pressure was obtained immediately following apical images in the supine position. Post-processing of echocardiograms with speckle tracking echocardiography and derivation of global myocardial work indices from LV pressure-strain loops was done using EchoPAC (General Electric, v203R73.0) (Figure 1). Results: Baseline demographics, echocardiographic measures and global myocardial work indices are reported in Table 1. The mean global work index is 1833 ± 278 mmHg with mean global work efficiency of 95 ± 1.3%. No gender difference in myocardial work indices are found (p>0.05 for all). Correlation between global work indices with age, systolic blood pressure, LV ejection fraction, and global longitudinal strain (GLS) are presented in Table 2. Conclusions: This is a pilot study to begin establishing normal adolescent indices of non-invasive myocardial work. Figure 1. Example