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Geomagnetic field effect on cardiovascular regulation.

Juraj Gmitrov1, Anna Gmitrova

  • 1National Institute of Public Health, Department of Environmental Health, Tokyo, Japan. gmitrovj@yahoo.com

Bioelectromagnetics
|January 22, 2004
PubMed
Summary

Geomagnetic field disturbances negatively impact cardiovascular regulation by affecting the arterial baroreflex, increasing blood pressure and myocardial oxygen consumption, posing a cardiovascular risk.

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Area of Science:

  • Cardiovascular Physiology
  • Geophysics
  • Neuroscience

Background:

  • Geomagnetic field (GMF) disturbances are linked to physiological effects.
  • Cardiovascular regulation involves complex neural and humoral mechanisms.
  • The arterial baroreflex plays a critical role in maintaining blood pressure homeostasis.

Purpose of the Study:

  • To elucidate the physiological mechanisms by which geomagnetic field disturbances influence cardiovascular regulation.
  • To investigate the role of the arterial baroreflex in mediating these effects.

Main Methods:

  • Hemodynamic monitoring in rabbits sedated with pentobarbital.
  • Assessment of arterial baroreflex sensitivity (BRS) using pharmacological challenges (phenylephrine, nitroprusside).
  • Analysis of short-term blood pressure and heart rate variabilities (SD of MAP and HR) in relation to geomagnetic activity indices (K, K(p)).

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Main Results:

  • A significant negative correlation was found between increasing geomagnetic disturbance (K(p)) and BRS, HR SD, and MAP SD.
  • Abrupt increases in geomagnetic disturbance correlated with significant elevations in mean arterial pressure (MAP) and myocardial oxygen consumption (MAP and HR product).

Conclusions:

  • The arterial baroreflex mechanism is involved in mediating the cardiovascular effects of geomagnetic field disturbances.
  • Geomagnetic field disturbances can increase cardiovascular risk by altering blood pressure and heart rate regulation.
  • The brainstem and higher neural centers regulating cardiovascular function are likely affected by geomagnetic fields.