Measurement of exercise cardiac output by thoracic impedance in healthy children

European Journal of Applied Physiology
Paul T Pianosi

Abstract

The purpose of this study was to track changes in stroke volume during exercise by impedance cardiography in order to validate the method, and to obtain such data in a large number of healthy children for reference purposes. One hundred and fifteen healthy children (aged 7-19 years) performed progressive exercise to voluntary exhaustion with work increments every minute on a cycle ergometer. Oxygen uptake (VO(2)) was measured on a breath-by-breath system. Cardiac output was measured with an ICG-M501 impedance cardiograph. Stroke volume was normalized for body surface area and expressed as stroke volume index. Cardiac output was regressed against VO(2), and differences between stroke volume index at rest and exercise were assessed by repeated measures analysis of variance. Cardiac output increased linearly with VO(2) in all subjects: individual slopes and intercepts averaged 5.16 (1.56) l.min(-1) per l.min(-1) VO(2), and 4.25 (1.92) l.min(-1), respectively [mean (SD)]. Stroke volume index rose by an average of 29% from rest to exercise, reaching a maximum of 52 ml.m(-2) in boys and girls. Most subjects demonstrated a continuous, gentle rise in stroke volume index with increasing work rate, though a minority demonstrated a fallin...Continue Reading

Citations

Aug 30, 2008·JAMA : the Journal of the American Medical Association·Daniel I FeigRichard J Johnson
Apr 14, 2005·European Journal of Applied Physiology·Joanne WelsmanNeil Armstrong
Jul 6, 2010·Archives of Physical Medicine and Rehabilitation·Bart E DrinkardNicholas A Di Prospero
Sep 26, 2012·Hypertension·Beth Soletsky, Daniel I Feig
Sep 21, 2006·Clinical Pharmacokinetics·Andrea N EdgintonStefan Willmann
May 26, 2017·Scandinavian Journal of Medicine & Science in Sports·P T PianosiP R Fischer

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