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Influence of hyperbaric environment on physiological tremor.

K Sakamoto1, N Itakura, M Takanokura

  • 1Department of Systems Engineering, University of Electro-Communications, Choufugaoka 1-5-1, Chofu City, Tokyo 182-8585, Japan. sakamoto@se.uec.ac.jp

Electromyography and Clinical Neurophysiology
|February 20, 2002
PubMed
Summary

High pressure environments affect physiological tremor. Nitrogen narcosis at 4 ATA decreased total power spectrum (TP), while heliox at 24 ATA increased TP, possibly due to high pressure nervous syndrome.

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Area of Science:

  • Physiology
  • Environmental Medicine
  • Neuroscience

Background:

  • Physiological tremor is a normal bodily function.
  • Understanding tremor under pressure is crucial for diving and space exploration.
  • Previous research has not fully elucidated tremor responses to extreme atmospheric pressures.

Purpose of the Study:

  • To investigate the impact of hyperbaric environments on the total power spectrum (TP) of human physiological tremor.
  • To differentiate the effects of nitrogen and heliox gas mixtures at varying pressures.
  • To explore the role of autonomic nervous system inhibitors in modulating tremor response to pressure.

Main Methods:

  • Subjects were exposed to pressures ranging from 1 to 24 ATA (Atmosphere Absolute).
  • Total power spectrum (TP) of physiological tremor was measured (0.5-50 Hz).

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  • Autonomic nervous system inhibitors (atropine, propanol) were administered at 3 ATA.

    • Main Results:

    • At 3 ATA, TP initially remained stable then increased; at 4 ATA (3.6 ATA nitrogen), TP decreased, correlating with nitrogen narcosis.
    • Using heliox, TP decreased at 16-19 ATA but increased at 24 ATA, potentially linked to high pressure nervous syndrome.
    • Atropine (parasympathetic inhibitor) increased TP at 3 ATA, while propanol (sympathetic inhibitor) decreased TP.

    Conclusions:

    • Physiological tremor is significantly altered by hyperbaric conditions, with pressure effects varying by gas composition and partial pressures.
    • Nitrogen narcosis and high pressure nervous syndrome demonstrably influence tremor dynamics.
    • Autonomic nervous system activity plays a key role in regulating tremor responses under pressure.