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J Appl Physiol 72: 1668-1674, 1992;
8750-7587/92 $5.00
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Journal of Applied Physiology, Vol 72, Issue 5 1668-1674, Copyright © 1992 by American Physiological Society

ARTICLES

Calf blood flow and posture: Doppler ultrasound calibrated by plethysmography

B. E. Van Leeuwen, J. Lubbers, G. J. Barendsen and L. de Pater
Department of Medical Physics, Faculty of Medicine, Groningen University, The Netherlands.

A procedure was developed that enables measurement of rapid variations in calf blood flow during voluntary rhythmic contraction of the calf muscles in supine, sitting, and standing positions. During the exercise, maximum blood velocity is measured by Doppler ultrasound equipment in the popliteal artery. The Doppler signals are calibrated by plethysmography to enable calculation of blood flow during exercise in ml.100 ml-1.min-1. Knowledge of the cross-sectional area of the vessel and the angle of insonation is not required in this procedure. Evaluation of the calibration method with 10 healthy volunteers showed that for each subject a new calibration was necessary after a change in posture; the relationship between the blood flow and the maximum Doppler frequency averaged over one heart cycle was linear for each calibration.


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