Abstract
To determine echocardiographic responses to exercise in normal adolescents, 26 healthy adolescents (ages 10.7–17.7 yrs) had M-mode echocardiograms of the LV and aorta (Ao) prior to and immediately following maximal exercise on a supine bicycle ergometer. The ventricular septum and LV posterior wall were digitized. Fractional shortening (FS), Ao systolic time intervals (PEP/ET) and approximate velocity of circumferential fiber, shortening (Vcf) were calculated. Maximal rate of contraction and relaxation indexed for maximal diameter (dD/dt-sys and dD/dt-dias, diameters/sec) were determined from the digitized trace. The average of 3 resting cycles was compared to the first adequate post-exercise study. All studies were completed within 3 minutes of cessation of exercise. Data are mean ± SE. All values changed significantly following exercise (p<.001).We present normative data on echocardiographic measurements of LV function in healthy adolescents following maximal supine exercise against which data from patients with suspected LV dysfunction can be compared. These data differ from those reported from adults during sub-maximal exercise. This technique is simple, does not involve radiation, and thus may be applied to relatively normal pediatric populations.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
