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Adrenergic vascular control

T Mano1

  • 1Department of Autonomic and Behavioral Neurosciences, Nagoya University, Japan.

Medicine and Science in Sports and Exercise
|October 1, 1996
PubMed
Summary
This summary is machine-generated.

Aging reduces the body's ability to regulate blood flow to muscles during changes in gravity. Muscle sympathetic nerve activity (MSNA) responses to simulated gravity changes are diminished in older adults.

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Area of Science:

  • Human physiology
  • Cardiovascular regulation
  • Aging research

Background:

  • Noradrenergic vasoconstrictor outflow to skeletal muscle, measured as muscle sympathetic nerve activity (MSNA), is crucial for cardiovascular homeostasis.
  • Understanding the influence of gravity and aging on MSNA is vital for comprehending physiological adaptations and potential health risks.

Purpose of the Study:

  • To investigate the gravity-dependency and age-dependency of MSNA in humans.
  • To analyze the relationship between aging, gravity, and cardiovascular responses.

Main Methods:

  • Microneurography technique was employed to measure MSNA.
  • Subjects were exposed to simulated microgravity (head-out immersion) and simulated high gravity (+Gz load via head-up tilt).
  • Arterial baroreflex sensitivity and hemodynamic responses were simultaneously monitored.

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Main Results:

  • Basal MSNA increased with aging in the supine position, independent of baroreflex sensitivity.
  • Gravity-dependent responses of MSNA (increase with +Gz, decrease with immersion) were attenuated in older adults.
  • Hemodynamic responses to gravity challenges also showed age-dependent reductions.

Conclusions:

  • Gravity-related changes in noradrenergic vasoconstrictor outflow to muscle are age-dependent, diminishing with aging.
  • These age-related alterations in MSNA may be linked to mechanisms governing gravity-dependent fluid shifts in the human body.