Resumen de Resistance Training and Diastolic Myocardial Tissue Velocities in Obese Children

Louise H. Naylor, Katie Watts, Joan Andree Sharpe, Thimoty William Jones, Elizabeth A. Davis, Alisha Thompson, Keith George, James Michael Ramsay, Gerry O'Driscoll, Daniel J. Green

• Purpose: The primary purpose of this study was to determine the effects of resistance exercise training on early diastolic myocardial velocities (E') in an obese pediatric population.

  Methods: Twenty-three obese adolescents were selected to participate in either a resistance-based training program (RT; n = 13, 12.2 +/- 0.4 yr, body mass index [BMI] = 32.5 +/- 1.9 kg[middle dot]m-2) or a nonexercise control intervention (n = 10, 13.6 +/- 0.7 yr, BMI = 30.2 +/- 2.6 kg[middle dot]m-2) for 8 wk. All subjects had repeated echocardiographic assessments to determine left ventricular (LV) geometry, early transmitral flow velocity (E), and E'.

  Results: LV mass and wall thicknesses did not significantly change with training or in controls. RT improved E' (11.9 +/- 0.5 to 13.3 +/- 0.5 cm[middle dot]s-1, P< 0.01) in the presence of a decrease in E/E' (8.17 +/- 0.39 to 7.06 +/- 0.30 cm[middle dot]s-1, P < 0.01), a marker of left atrial pressure. No changes were evident in the inactive control subjects.

  Conclusions: A supervised 8-wk RT exercise program improved early diastolic tissue velocity in obese children, independent of changes in LV morphology