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Related Experiment Videos

Speech motor control and acute mountain sickness.

Allen Cymerman1, Philip Lieberman, Jesse Hochstadt

  • 1Thermal and Mountain Medicine Division, U.S. Army Research Institute of Environmental Medicine, Natick, MA 01760, USA. allen.cymerman@na.amedd.army.mil

Aviation, Space, and Environmental Medicine
|August 17, 2002
PubMed
Summary

Speech changes, like voice onset time (VOT), can objectively measure Acute Mountain Sickness (AMS) severity. This research explores how simulated high altitude affects speech patterns and AMS symptoms.

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Area of Science:

  • Physiology
  • Altitude Medicine
  • Speech Science

Background:

  • Accurate quantification of Acute Mountain Sickness (AMS) is crucial for evaluating acclimatization and interventions.
  • Objective measures are needed to assess AMS severity reliably.

Purpose of the Study:

  • To investigate the correlation between changes in speech articulation (voice onset time; VOT) and AMS severity.
  • To determine if speech motor control alterations can serve as an objective AMS indicator.

Main Methods:

  • Fifteen volunteers were exposed to simulated 4300 m altitude for 48 hours in a hypobaric chamber.
  • Speech motor control was assessed by analyzing timing patterns of spoken words (VOT).
  • AMS severity was evaluated using the Environmental Symptoms Questionnaire (ESQ).
Keywords:
NASA Discipline Space Human FactorsNon-NASA Center

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Main Results:

  • Significant AMS symptoms developed within 4 hours, peaking at 16 hours.
  • Labial and velar VOTs were altered at various time points, while alveolar VOTs remained unchanged.
  • Vowel sound duration increased after 4 hours of exposure, correlating with AMS symptoms.

Conclusions:

  • Exposure to high altitude (4300 m) objectively alters speech production measures.
  • Changes in speech production, specifically VOT, correlate with AMS severity.
  • Speech alterations may serve as a novel, objective biomarker for AMS and central nervous system hypoxia.