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Microgravity simulation: physical and psychological workload evaluation tests in an underwater environment.

Elisabetta Toscano1, Enrica Fubini, Enrico Gaia

  • 1Dipartimento di Biologia Animale e dell'Uomo, Università degli Studi di Torino, Torino 10123, Italy. elisabetta.toscano@unito.it

Applied Ergonomics
|May 26, 2004
PubMed
Summary

Simulating space missions underwater, researchers evaluated astronaut workload and anxiety. Physiological measures showed moderate work, while anxiety levels remained low, confirming the validity of neutral buoyancy testing for space system design.

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Area of Science:

  • Human Factors Engineering
  • Space Physiology
  • Occupational Health

Background:

  • Space missions require complex Extra-Vehicular Activities (EVAs).
  • Earth-based simulations, like neutral buoyancy testing, are crucial for evaluating space systems and crew interfaces.
  • Understanding physiological and psychological responses during simulations is vital for accurate workload assessment.

Purpose of the Study:

  • To assess the workload and anxiety levels of astronauts during neutral buoyancy simulations of EVAs.
  • To evaluate the crew interface design of the Columbus module for the International Space Station.
  • To validate the use of physiological measurements and questionnaires for workload and anxiety assessment in simulated space environments.

Main Methods:

  • Conducted neutral buoyancy tests in a specialized aquatic facility to simulate EVAs.

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  • Measured physiological parameters including heart rate and pulmonary ventilation during underwater tasks.
  • Administered pre- and post-dive questionnaires to assess subject anxiety levels.
  • Classified workload using established physiological criteria (Christensen, Wells).

    • Main Results:

    • Underwater work significantly increased heart rate (approx. 50% above rest) and pulmonary ventilation (approx. 200% above rest).
    • Physiological workload was classified as moderate based on established criteria.
    • Subjects reported low anxiety, primarily due to unfamiliarity with neutral buoyancy and aquatic environment safety concerns.
    • Psychological effects did not significantly influence physiological measurements.

    Conclusions:

    • Neutral buoyancy testing provides a valid method for assessing astronaut workload during simulated EVAs.
    • Physiological responses are directly attributable to task workload, with minimal influence from psychological factors.
    • The study supports the use of neutral buoyancy facilities for evaluating space system usability and crew interface design.