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Related Experiment Videos

Autonomic blockade does not prevent learned heart rate attenuation during exercise.

B T Engel1, M I Talan

  • 1Laboratory of Behavioral Sciences, National Institute on Aging National Institutes of Health, Baltimore, MD 21224.

Physiology & Behavior
|February 1, 1991
PubMed
Summary
This summary is machine-generated.

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Monkeys learned to control heart rate and exercise, demonstrating adaptive cardiovascular control. This "central command" is a flexible behavior, not fixed reflexes, even under drug influence.

Area of Science:

  • Cardiovascular Physiology
  • Behavioral Neuroscience
  • Exercise Physiology

Background:

  • The concept of "central command" in exercise physiology is often viewed as a set of fixed reflexes.
  • Understanding the adaptive nature of cardiovascular and motor control during volitional tasks is crucial.

Purpose of the Study:

  • To investigate the adaptive nature of "central command" in controlling heart rate and exercise performance.
  • To determine if cardiovascular control during exercise is a fixed reflex or a learned behavior.

Main Methods:

  • Operant conditioning was used to train three monkeys to slow heart rate and exercise (lift weights).
  • Physiological parameters including heart rate, blood pressure, and oxygen consumption were monitored beat-by-beat.
  • Experiments were conducted under various pharmacological conditions: beta-adrenergic blockade (atenolol), combined alpha- and beta-adrenergic blockade (prazosin), and cholinergic blockade (methylatropine).

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Main Results:

  • Monkeys successfully learned to combine heart rate slowing and exercise to attenuate exercise-induced tachycardia under all drug conditions.
  • Cardiovascular efficiency during the combined task was unaffected by sympathetic blockade but was reduced by parasympathetic blockade.
  • The ability to adapt cardiac function indicates "central command" is a behavior shaped by environmental factors.

Conclusions:

  • "Central command" is an adaptive behavior influenced by environmental contingencies, not solely fixed somato-motor reflexes.
  • Cardiovascular control during volitional exercise is flexible and can be modified through learning.
  • Parasympathetic pathways play a significant role in maintaining cardiac efficiency during complex learned behaviors involving exercise.