Non-invasive ultrasonic output monitoring in exercise testing

Knobloch, Karsten, Hoeltke, Volker, Jakob, Ernst, Vogt, Peter M. and Phillips, Rob (2008) Non-invasive ultrasonic output monitoring in exercise testing. International Journal of Cardiology, 126 3: 445-447. doi:10.1016/j.ijcard.2007.02.053

Author Knobloch, Karsten
Hoeltke, Volker
Jakob, Ernst
Vogt, Peter M.
Phillips, Rob
Title Non-invasive ultrasonic output monitoring in exercise testing
Journal name International Journal of Cardiology   Check publisher's open access policy
ISSN 0167-5273
Publication date 2008-06
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.ijcard.2007.02.053
Volume 126
Issue 3
Start page 445
End page 447
Total pages 3
Editor C. Kawai
A.J.S. Coats
Place of publication Amsterdam
Publisher Elsevier
Collection year 2008
Language eng
Subject 110201 Cardiology (incl. Cardiovascular Diseases)
920103 Cardiovascular System and Diseases
Formatted abstract
The purpose of this study was to evaluate the relationship of breath-by-breath oxygen uptake (VO2) and CO, cardiac index (CI), stroke volume (SV) and heart rate (HR) determined by a non-invasive continuous wave (CW) Doppler-based system (USCOM) in healthy adolescent and adult athletes during exercise treadmill testing.

Twenty athletes were enrolled for a standardized ramp treadmill test including transthoracic echocardiography at rest, incremental breath-by-breath spiroergometry, lactate kinetics and CW Doppler.


VO2 max was 51 ± 11 ml/min/kg in the adolescent cross country skiers (CI 8.2 ± 1.2 l/min/m2) and 50 ± 12 ml/min/kg in adult soccer referees (CI 7.1 ± 1.2 l/min/m2). CW Doppler hemodynamic variables showed significant correlation with VO2 (p < 0.01, n = 95) across the total of measures, with excellent correlation demonstrated for CO and CI (0.904 and 0.897), while HR and SV showed good to very good correlation with r values of 0.842 and 0.766, respectively. Correlation of the variables at peak exercise and 1 and 3 min after recovery, demonstrate that CO and SV show superior correlation with peak oxygen consumption (VO2 max). The regression equation for VO2 and COUSCOM was VO2 = 4.43COUSCOM–10.3.


CW Doppler measurement of cardiac output is feasible as a measure of cardiac performance during standardized treadmill testing in adolescent and adult athletes.
Keyword Ultrasound
Cardiac output
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Faculty of Health and Behavioural Sciences -- Student Publications
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Created: Thu, 16 Apr 2009, 14:12:24 EST by Sarah Elliott on behalf of Royal Brisbane Clinical School