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Articles in PresS, published online ahead of print October 18, 2002
J Appl Physiol, 10.1152/jap.00817.2002
Submitted on September 9, 2002
Accepted on October 14, 2002
1 Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, Texas, USA
* To whom correspondence should be addressed. E-mail: dkeller{at}hsc.unt.edu.
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) years 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 five-second 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. Carotid baroreflex 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 (EL) (16.4 ± 1.6%) compared to rest (33 ± 2.1%) and the non-exercising 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.
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