Human femoral artery and estimated muscle capillary blood flow kinetics following the onset of exercise.

Abstract:

:The purpose of this study was to compare the kinetics of estimated capillary blood flow (Qcap) to those of femoral artery blood flow (QFA) and estimated muscle oxygen uptake (VO2m). Nine healthy subjects performed a series of transitions from rest to moderate (below estimated lactate threshold, 6 min bouts) knee extension exercise. Pulmonary oxygen uptake (VO2) was measured breath by breath, (QFA) was measured continuously using Doppler ultrasound, and deoxyhaemoglobin ([HHb]) was estimated by near-infrared spectroscopy over the rectus femoris throughout the tests. The time course of (Qcap) was estimated by rearranging the Fick equation (i.e. Qcap = VO2m/(a-v)O2), (arterio - venous O2 difference) using the primary component of VO2 to represent VO2m and [HHb] as a surrogate for (a - v)O2. The overall kinetics of QFA (mean response time, MRT, 13.7 +/- 7.0 s), VO2m (tau, 27.8 +/- 9.0 s) and Qcap (MRT, 41.4 +/- 19.0 s) were significantly (P < 0.05) different from each other. We conclude that for moderate intensity knee extension exercise, conduit artery blood flow (QFA) kinetics may not be a reasonable approximation of blood flow kinetics in the microcirculation (Qcap), the site of gas exchange. This temporal dissociation suggests that blood flow may be controlled differently at the conduit artery level than in the microcirculation.

journal_name

Exp Physiol

journal_title

Experimental physiology

authors

Harper AJ,Ferreira LF,Lutjemeier BJ,Townsend DK,Barstow TJ

doi

10.1113/expphysiol.2005.032904

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

661-71

issue

4

eissn

0958-0670

issn

1469-445X

pii

expphysiol.2005.032904

journal_volume

91

pub_type

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