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[Structure of hemodynamic responses in the central command to move]
Fiziologicheskii Zhurnal SSSR Imeni I. M. Sechenova
|November 1, 1981
Summary
Central command activation of skeletal muscles significantly increases blood pressure but not cardiac output. Vascular resistance, not vasodilation, primarily drives these cardiovascular responses during fictitious scratching.
Area of Science:
- Cardiovascular Physiology
- Neuroscience
- Skeletal Muscle Activation
Context:
- Investigating the hemodynamic effects of "central command" on skeletal muscles.
- Utilizing an experimental model of "fictitious scratching" in immobilized decerebrated cats.
- Examining the role of beta-adrenoreceptors and circulating catecholamines.
Purpose:
- To elucidate the cardiac and vascular components of the hemodynamic response to central command.
- To determine the primary mechanisms influencing blood flow and pressure changes.
- To assess the role of peripheral vascular resistance versus specific vasodilation.
Summary:
- Activation of the gastrocnemius muscle during "fictitious scratching" elevated blood pressure by 57 mm Hg.
- Cardiac output and common iliac artery blood flow remained largely unchanged.
- Maximal increases in iliac artery blood flow were linked to beta-adrenoreceptor stimulation by catecholamines.
Impact:
- Suggests adaptive cardiovascular responses to central command rely on increased peripheral vascular resistance.
- Indicates a lack of specific vasodilator influences on the targeted skeletal muscles.
- Provides insights into the neural control of cardiovascular function during motor commands.