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[Effect of static work on the baroreceptor reflex in cats]
Fiziologicheskii Zhurnal SSSR Imeni I. M. Sechenova
|July 1, 1978
Summary
Cats trained to escape noxious stimuli showed increased blood pressure and heart rate during isometric exercise. The baroreceptor reflex bradycardia was inhibited by a conditioned stimulus and exercise, suggesting exercise impacts cardiovascular regulation.
Area of Science:
- Cardiovascular Physiology
- Exercise Physiology
- Neuroscience
Context:
- Investigating the baroreceptor reflex in animal models.
- Understanding cardiovascular responses during physical exertion.
- Examining the influence of conditioned stimuli on autonomic reflexes.
Purpose:
- To assess the impact of isometric exercise on cardiovascular parameters in cats.
- To evaluate the baroreceptor reflex's chronotropic component under various conditions.
- To determine how conditioned stimuli and exercise affect baroreflex sensitivity.
Summary:
- Ten cats underwent isometric exercise training to escape noxious stimulation, exhibiting elevated arterial pressure and heart rate without changes in cardiac output.
- Baroreflex bradycardia was tested using noradrenaline infusion and aortic occlusion, revealing partial inhibition by a 1000 Hz tone and further suppression during exercise.
- The study discusses the mechanisms underlying the suppression of the baroreflex during muscular exercise.
Impact:
- Provides insights into the neural control of circulation during exercise.
- Highlights the interplay between conditioned stimuli, exercise, and autonomic cardiovascular regulation.
- Contributes to understanding physiological adaptations and limitations during physical stress.