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Related Experiment Videos

Predicting heart growth during puberty: The Muscatine Study.

K F Janz1, J D Dawson, L T Mahoney

  • 1Department of Sport, Health, and Leisure Studies, University of Iowa, Iowa City 52242, USA. kathleen-janz@uiowa.edu

Pediatrics
|May 9, 2000
PubMed
Summary

This study found that fat-free mass and aerobic fitness are key predictors of heart growth in children and adolescents. Maintaining these factors helps predict stable heart size throughout puberty.

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Area of Science:

  • Pediatric Cardiology
  • Human Growth and Development
  • Exercise Physiology

Background:

  • Childhood heart growth correlates with somatic growth (weight, fat-free mass, height).
  • Cardiac workload increases with age, leading to greater variability in heart size relative to body size.
  • Limited understanding exists regarding functional attributes influencing cardiac workload and their impact on heart growth during childhood and adolescence.

Purpose of the Study:

  • To investigate cross-sectional and longitudinal relationships between aerobic fitness, body size, blood pressure, and left ventricular mass (LVM) through puberty.
  • To identify predictors of heart growth during puberty and the tracking of LVM from pre-puberty to late and post-puberty.
  • To assist pediatricians in distinguishing normal LVM increases from those indicative of left ventricular hypertrophy.

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Main Methods:

  • A 5-year repeated-measures study of 125 healthy children (mean baseline age 10.5 years) in pre- or early puberty.
  • Quarterly assessments of anthropometry (FFM, fatness, weight, height), resting BP, and LVM (echocardiography).
  • Annual assessments of aerobic fitness, peak exercise BP, and sexual maturation; statistical analysis using Spearman correlations and gender-specific stepwise multivariate analysis.

Main Results:

  • Boys exhibited greater height, FFM, aerobic fitness, and LVM compared to girls, with higher rates of change.
  • Strong tracking of heart size was observed (r(s) =.65-.87), with individuals in extreme tertiles at baseline likely to remain so.
  • In boys, baseline FFM predicted 54% of follow-up LVM; changes in aerobic fitness and FFM predicted 55% of LVM change.
  • In girls, baseline aerobic fitness and fatness predicted 45% of follow-up LVM; changes in FFM predicted 58% of LVM change.

Conclusions:

  • Fat-free mass and aerobic fitness are significant predictors of left ventricular mass in children and adolescents.
  • Tracking of heart size is strong, suggesting early predictors influence long-term cardiac development.
  • Findings aid in differentiating normal cardiac growth from potential left ventricular hypertrophy in pediatric populations.