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Department of Integrative Physiology and Cardiovascular Research Institute, University of North Texas Health Science Center, Fort Worth, Texas 76107
We sought to determine whether
carotid baroreflex (CBR) control of muscle sympathetic nerve activity
(MSNA) was altered during dynamic exercise. In five men and three
women, 23.8 ± 0.7 (SE) yr of age, CBR function was evaluated at
rest and during 20 min of arm cycling at 50% peak O2
uptake using 5-s periods of neck pressure and neck suction. From rest
to steady-state arm cycling, mean arterial pressure (MAP) was
significantly increased from 90.0 ± 2.7 to 118.7 ± 3.6 mmHg
and MSNA burst frequency (microneurography at the peroneal nerve) was
elevated by 51 ± 14% (P < 0.01). However, despite the marked increases in MAP and MSNA during exercise, CBR-
%MSNA responses elicited by the application of various levels of neck pressure and neck suction ranging from +45 to 
80 Torr were
not significantly different from those at rest. Furthermore, estimated
baroreflex sensitivity for the control of MSNA at rest was the same as
during exercise (P = 0.74) across the range of neck
chamber pressures. Thus CBR control of sympathetic nerve activity
appears to be preserved during moderate-intensity dynamic exercise.
mean arterial pressure; carotid baroreceptors; neck pressure; neck suction; arm exercise
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