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Text
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URL Address
<a href="http://doi.org/10.1152/ajpheart.1997.273.6.h2738" target="_blank" rel="noreferrer noopener">http://doi.org/10.1152/ajpheart.1997.273.6.h2738</a>
Pages
H2738–2745
Issue
6
Volume
273
Dublin Core
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Title
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Sinoaortic denervation prevents postexercise reductions in arterial pressure and cardiac sympathetic tonus.
Publisher
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The American journal of physiology
Date
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1997
1997-12
Subject
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*Muscle Denervation; Animals; Autonomic Nervous System/physiology/physiopathology; Blood Pressure/*physiology; Heart Rate/*physiology; Heart/innervation/*physiology/physiopathology; Hypertension/*physiopathology; Inbred SHR; Male; Muscle Tonus; Physical Exertion/*physiology; Rats; Sinoatrial Node/*innervation; Sympathetic Nervous System/*physiology/physiopathology
Creator
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Chandler M P; DiCarlo S E
Description
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Arterial pressure, cardiac sympathetic tonus (ST), and heart rate (HR) are reduced after a single bout of dynamic exercise in spontaneously hypertensive rats (SHR). To test if the arterial baroreflex is required for these postexercise responses, intact (n = 9) and sinoaortic-denervated (SAD) rats (n = 5) were chronically instrumented with an arterial catheter for the measurement of arterial pressure and HR and for the infusion of cardiac autonomic antagonists. Five days after instrumentation, cardiac ST and parasympathetic tonus (PT) were determined under two experimental conditions (no exercise and postexercise). SAD rats did not alter no-exercise cardiac ST (intact 47 +/- 3 vs. SAD 50 +/- 3 beats/min); however, no-exercise PT was reduced (intact -24 +/- 2 vs. SAD -4 +/- 4 beats/min, P \textless 0.05). Acute exercise reduced arterial pressure (postexertional hypotension, -20 +/- 3 mmHg, P \textless 0.05), cardiac ST (no exercise 47 +/- 3 vs. postexercise 24 +/- 3 beats/min, P \textless 0.05), and PT (no exercise -24 +/- 2 vs. postexercise -11 +/- 2 beats/min, P \textless 0.05) in intact SHR. In contrast, SAD prevented postexercise reductions in arterial pressure and cardiac ST (no exercise 50 +/- 3 vs. postexercise 59 +/- 7 beats/min). Furthermore, SAD had no effect on postexercise PT (no exercise -4 +/- 4 vs. postexercise -7 +/- 4 beats/min). These results demonstrate that the arterial baroreflex is required for the reduction in arterial pressure and cardiac ST that occurs in SHR after a single bout of dynamic exercise.
Identifier
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<a href="http://doi.org/10.1152/ajpheart.1997.273.6.h2738" target="_blank" rel="noreferrer noopener">10.1152/ajpheart.1997.273.6.h2738</a>
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*Muscle Denervation
1997
Animals
Autonomic Nervous System/physiology/physiopathology
Blood Pressure/*physiology
Chandler M P
DiCarlo S E
Heart Rate/*physiology
Heart/innervation/*physiology/physiopathology
Hypertension/*physiopathology
Inbred SHR
Male
Muscle Tonus
Physical Exertion/*physiology
Rats
Sinoatrial Node/*innervation
Sympathetic Nervous System/*physiology/physiopathology
The American journal of physiology