Tissue Doppler assessment of ventricular function during cycling in 7- to 12-yr-old boys

Thomas Rowland, Kevin Heffernan, Sae Young Jae, George Echols, Bo Fernhall

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Purpose: Studies utilizing submaximal supine exercise have indicated that tissue Doppler imaging (TDI) may be useful for assessing ventricular systolic and diastolic function during exercise and might offer a means of detecting patients with early myocardial dysfunction. This investigation of 14 healthy boys ages 7-12 yr was designed to assess measures of inotropic and lusitropic function during maximal upright cycle exercise. Methods: Color tissue Doppler imaging (S and E′ waves, indicative of systolic and diastolic function, respectively), stroke volume, and mitral peak inflow velocity (E wave) were recorded at rest and during a progressive upright cycle test to exhaustion. Results: Values of TDI-S and TDI-E′ were obtained at exhaustive exercise in all but one subject. Mean value of S rose 163% (3.8 ± 1.2 to 10.0 ± 2.5 cm·s-1), and average E′ increased by 92% (-6.3 ± 2.2 to -12.1 ± 3.2 cm·s-1). No significant changes were observed in the ratio of E′ to mitral peak flow velocity (E), suggesting that left ventricular end-diastolic pressure remained stable. Conclusions: These data indicate that measurement of TDI is feasible during maximal upright exercise, and velocities obtained may provide insights into ventricular systolic and diastolic functional capacity.

Original languageEnglish (US)
Pages (from-to)1216-1222
Number of pages7
JournalMedicine and Science in Sports and Exercise
Volume38
Issue number7
DOIs
StatePublished - Jul 1 2006
Externally publishedYes

Keywords

  • Echocardiography
  • Exercise testing
  • Heart output
  • Physical fitness

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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