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Evaluation of the Validity, Acceptability and Usability of Biomathematical Models to Predict Fatigue in an Operational Environment (Operational_Fatigue)
Principal Investigator
Research Area:
Behavior and performance
Species Studied
Scientific Name: Homo sapiens Species: Human

Biomathematical models hold promise as tools that can be used to manage fatigue risks in an operational setting. There are numerous models available to predict fatigue-related performance impairment arising from sleep loss, circadian misalignment, and sleep inertia. It is imperative that any model considered for use during space flight missions be validated in an operational setting in order to ensure that predictions are reliable and consistent. Given the complexity of the underlying causes of fatigue, there are wide individual differences in response to mission stressors. However, the majority of candidate models provide predictions based on average human responses, making it difficult to use the models to make operational decisions for individuals. In addition, there are no published reports on the acceptability, usability, and feasibility of any of the current models. Effective incorporation in a space flight environment requires model-based software systems that are easy to use by a wide-range of operators and are integrated with other scheduling constraints that are relevant in space flight operations.

This study had the following specific aims:

  1. Validate model predictions in a space flight analog.
  2. Evaluate acceptability, usability, and feasibility of the selected sleep-wake model software user interface.
  3. Incorporate model predictions into Playbook and assess usability and acceptability of model in the context of scheduling and planning.

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Technology assessment

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Data Information
Data Availability
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Errors, number
False starts
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Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
HERA Campaign 4 05/06/2017 06/18/2018 Four 45 days One 23 days

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Johnson Space Center LSDA Office
Project Manager: Pamela A. Bieri
Institutional Support
National Aeronautics and Space Administration (NASA)
Proposal Date
Proposal Source
2015-16 HERO NNJ15ZSA001N