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Related Experiment Videos

Exercise-induced altitude decompression sickness

A A Pilmanis1, R M Olson, M D Fischer

  • 1High Altitude Protection Flight Stress Protection Division, Brooks AFB, TX 78235-5104, USA.

Aviation, Space, and Environmental Medicine
|January 23, 1999
PubMed
Summary
This summary is machine-generated.

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Exercise at altitude increases decompression sickness (DCS) risk. This study found no significant difference in DCS incidence between dynamic and isometric exercise types, with a 40% overall DCS rate during altitude exposure.

Area of Science:

  • Aerospace Medicine
  • Physiology
  • Environmental Health

Background:

  • Exercise at altitude is known to increase decompression sickness (DCS) risk.
  • Limited data exists on how specific exercise types affect DCS incidence.
  • This study investigated isometric versus dynamic exercise and arm versus leg exertion.

Purpose of the Study:

  • To compare the relative hazards of isometric (static) versus dynamic (motion-involving) exercise at altitude.
  • To compare the effects of arm versus leg exercise on DCS risk.
  • To determine DCS incidence under specific exercise conditions at simulated altitude.

Main Methods:

  • 32 healthy males were exposed to 29,500 ft for 4 hours or until DCS occurred.
  • Subjects performed isometric arm, isometric leg, dynamic arm, and dynamic leg exercises at a symptom-free altitude.
Keywords:
NASA Discipline Environmental HealthNon-NASA Center

Related Experiment Videos

  • Precordial venous gas emboli (VGE) were monitored using ultrasound.

    • Main Results:

    • DCS incidence was 50% for dynamic arm, 38% for dynamic leg, 41% for isometric arm, and 31% for isometric leg exercise.
    • Venous gas emboli (VGE) incidence ranged from 47% to 66%.
    • No statistically significant differences in DCS or VGE were observed between exercise types.

    Conclusions:

    • Under the tested conditions, dynamic and isometric exercises posed similar risks for eliciting DCS at altitude.
    • Exercise during a 4-hour altitude exposure resulted in a 40% DCS incidence.
    • Further research may be needed to elucidate specific risk factors for DCS during exertion at altitude.