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Human tracking performance changes during combined +Gz and +/- Gy stress

J W Frazier, D W Repperger, D N Toth

Aviation, Space, and Environmental Medicine

|May 1, 1982

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Centrifuge testing revealed significant roll-axis tracking decrements under +5 Gz and combined +5 Gz with radiation exposure. Performance declined with increasing Gz and radiation levels, though restraint systems were adequate.

Area of Science:

Human factors and performance under stress
Aerospace medicine
Physiological responses to G-force and radiation

Background:

Understanding human performance limitations is crucial for aerospace safety.
Previous research indicates G-force impacts cognitive and motor functions.
The combined effects of G-force and radiation on performance are not fully understood.

Purpose of the Study:

To evaluate roll-axis tracking performance under simulated aerospace stress conditions.
To quantify performance decrements associated with +5 Gz and combined +5 Gz/+/- radiation exposure.
To assess the adequacy of standard restraint systems in these environments.

Main Methods:

Human subjects were exposed to static and dynamic stress environments on a centrifuge.

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Stress conditions included +5 Gz and combined +5 Gz with +/- 1 or +/- 2 Gray (Gy) radiation for 95 seconds.

Roll-axis tracking performance and heart rate were monitored.

Main Results:

Roll-axis tracking performance decreased by 19% at +5 Gz, 45% at +5 Gz/+/- 1 Gy, and 70% at +5 Gz/+/- 2 Gy compared to static conditions.
Heart rate increased during stress conditions.
No significant heart rate differences were observed between +5 Gz and +5 Gz/+/- 2 Gy conditions.

Conclusions:

Combined +5 Gz and radiation exposure significantly impairs roll-axis tracking performance.
Standard lap belt and shoulder harness restraint systems were adequate for the tested G environments.
Further research may be needed to explore optimal restraint and protective measures for combined stressors.