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Copenhagen Muscle Research Centre, Rigshospitalet, DK-2200 Copenhagen N, Denmark
Received 21 January 1997; accepted in final form 9 June 1997.
Rådegran, G. Ultrasound Doppler
estimates of femoral artery blood flow during dynamic knee extensor
exercise in humans. J. Appl. Physiol.
83(4): 1383-1388, 1997.
Ultrasound Doppler has been used to
measure arterial inflow to a human limb during intermittent static
contractions. The technique, however, has neither been thoroughly
validated nor used during dynamic exercise. In this study, the inherent
problems of the technique have been addressed, and the accuracy was
improved by storing the velocity tracings continuously and calculating
the flow in relation to the muscle contraction-relaxation phases. The
femoral arterial diameter measurements were reproducible with a mean
coefficient of variation within the subjects of 1.2 ± 0.2%. The
diameter was the same whether the probe was fixed or repositioned at
rest (10.8 ± 0.2 mm) or measured during dynamic exercise. The blood
velocity was sampled over the width of the diameter and the parabolic
velocity profile, since sampling in the center resulted in an
overestimation by 22.6 ± 9.1% (P < 0.02). The femoral arterial Doppler blood flow increased linearly
(r = 0.997, P < 0.001) with increasing load [Doppler blood flow = 0.080 · load (W) + 1.446 l/min] and was correlated positively with simultaneous
thermodilution venous outflow measurements
(r = 0.996, P < 0.001). The two techniques were
linearly related (Doppler = thermodilution · 0.985 + 0.071 l/min; r = 0.996, P < 0.001), with a coefficient of
variation of ~6% for both methods.
blood velocity; flow profile; vessel diameter
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