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Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, Texas 76107
We sought to test the hypothesis that
the carotid baroreflex (CBR) alters mean leg blood flow (LBF) and leg
vascular conductance (LVC) at rest and during exercise. In seven men
and one woman, 25 ± 2 (SE) yr of age, CBR control of LBF and LVC
was determined at rest and during steady-state one-legged knee
extension exercise at ~65% peak O2 uptake. The
application of 5-s pulses of +40 Torr neck pressure and 
60 Torr neck
suction significantly altered mean arterial pressure (MAP) and LVC both
at rest and during exercise. CBR-mediated changes in MAP were similar
between rest and exercise (P > 0.05). However,
CBR-mediated decreases in LVC (%change) to neck pressure were
attenuated in the exercising leg (16.4 ± 1.6%) compared with
rest (33 ± 2.1%) and the nonexercising leg (23.7 ± 1.9%)
(P < 0.01). These data suggest CBR control of blood
pressure is partially mediated by changes in leg vascular tone both at rest and during exercise. Furthermore, despite alterations in CBR-induced changes in LVC during exercise, CBR control of blood pressure was well maintained.
carotid baroreceptors; neck pressure; neck suction; functional sympatholysis; leg blood flow
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