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[Hypobaric hypoxia and catecholaminuria in normal humans].

J Lecomte1, D Lagneaux

  • 1Université de Liège, Institut Léon-Fredericq.

Comptes Rendus Des Seances De La Societe De Biologie Et De Ses Filiales
|January 1, 1989
PubMed
Summary

Hypoxic hypobaric chemostimulation at high altitude did not alter blood pressure or catecholamine levels in healthy individuals. This suggests that without additional stressors, this type of hypoxia does not activate the sympathetic nervous system.

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Area of Science:

  • Environmental Physiology
  • Altitude Medicine
  • Human Physiology

Background:

  • High altitude environments present challenges to human physiology due to reduced oxygen availability (hypobaric hypoxia).
  • Chemostimulation is a physiological response to changes in blood gases, potentially impacting the autonomic nervous system.

Purpose of the Study:

  • To investigate the effects of hypoxic hypobaric chemostimulation on orthosympathetic activity in humans under controlled conditions.
  • To determine if altitude-induced hypoxia alone, without other stressors, influences systemic blood pressure and catecholamine excretion.

Main Methods:

  • Six healthy subjects resided at a high-altitude station (3,580 m) for two days.
  • Systemic blood pressure and urinary catecholamine excretion were monitored and compared to sea-level baseline values.
  • Subjects were maintained in excellent ambient conditions, avoiding muscular exercise, temperature changes, and significant psychic alertness challenges.

Main Results:

  • No significant modifications in systemic blood pressure were observed during the initial two days at high altitude.
  • Urinary catecholamine excretion levels remained unchanged compared to sea-level measurements.
  • These findings indicate a lack of sympathetic nervous system activation under these specific conditions.

Conclusions:

  • Hypobaric hypoxia-induced chemostimulation does not appear to affect orthosympathetic activity in humans when other stressors are absent.
  • The human body can adapt to moderate high-altitude conditions without immediate sympathetic nervous system over-activation, provided environmental and physical demands are minimized.

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