Cardiac strain during upright cycle ergometry in adolescent males

Viswanath B. Unnithan, Thomas Rowland, Martin R. Lindley, Denise M. Roche, Max Garrard, Piers Barker

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Little evidence exists with regard to changes in cardiac strain that occur during submaximal exercise in young males. The aims of the study were to evaluate the changes that occur in longitudinal (L), radial (R), and endocardial circumferential (EC) strain during submaximal upright cycle ergometry and to examine the test-retest reproducibility of these measurements. Fourteen recreationally active, adolescent (age: 17.9 ± 0.7 years) males volunteered for the study. All subjects underwent an incremental (40 W) submaximal cycle ergometer test. L, R, and EC strain values were obtained using speckle tracking, from two-dimensional B-mode images of the left ventricle (LV) during rest and the initial stages of submaximal exercise (40 and 80 W). The average of 6 LV segments was used to determine both peak wall deformation (%) and the time to peak deformation (ms). There was a statistically (P < 0.05) significant increase from rest to submaximal exercise for peak deformation for L, R, and EC strain. There was a statistically significant (P < 0.05) decrease from rest to submaximal exercise for time to peak for L and R and EC strain and between submaximal workloads for time to peak for L strain and EC strain. Coefficients of variation demonstrated reproducibility for upright strain and strain rate measurements similar to published supine measurements. This study has demonstrated that changes in left ventricular wall deformation (L, R and EC strain) that occur during the transition from rest to submaximal exercise can be reliably measured and confirm that a healthy LV has a hyperdynamic response to exercise.

Original languageEnglish
Pages (from-to)638-643
Number of pages6
JournalEchocardiography (Mount Kisco, N.Y.)
Volume32
Issue number4
Early online date12 Aug 2014
DOIs
Publication statusPublished - 1 Apr 2015
Externally publishedYes

Keywords

  • Adolescent
  • Elastic Modulus
  • Ergometry
  • Heart Ventricles
  • Humans
  • Male
  • Physical Exertion
  • Posture
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Shear Strength
  • Stress, Mechanical
  • Tensile Strength
  • Ultrasonography
  • Ventricular Function, Left
  • Journal Article

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