Abstract 8995: The Munich Triathlon Heart Study: Ventricular Function, Myocardial Velocities and 2-d Strain In Healthy Children Before and After Endurance Stress
Objectives: Intense exercise has been shown to have negative effects on systolic- and diastolic ventricular function in adults. Very little is known about the normal reaction of the growing heart to endurance stress. Design: Longitudinal follow-up study pre- and post age adopted triathlon Setting: Tertiary paediatric cardiac centre Patients: 26 healthy children (18 males, 7.9-16.4 years, mean 12.6 years) took part in an age adapted triathlon circuit.
Methods: The athletes were investigated by 2-D-echo/speckle tracking, M-mode, PW-Doppler, colour-Doppler and colour codes tissue Doppler two to four weeks before and immediately after the race.
Results: After the competition there was an increase in cardiac output, mediated by an increase in heart rate and not by an elevated preload, according the mechanism of Frank-Starling. 2-D speckle tracking shows a reduced longitudinal strain in the right ventricle and additionally reduced circumferential strain in the left ventricle with attenuation of the systolic function. The late diastolic inflow velocities are increased in both ventricles, indicating reduced diastolic function due to an impairment of myocardial relaxation.
Conclusion: Systolic- and diastolic function were attenuated in children and adolescents after participating in an age adopted triathlon which took place in Munich 2009. The sequelae of these alterations are unclear and especially the growing heart might be more susceptible to myocardial damage caused by intense endurance stress.
- © 2012 by American Heart Association, Inc.