Task Evaluation of the validity, acceptability and usability of bio-mathematical models to predict fatigue in an operational environment
Last Published:  07/31/19 10:05:33 AM (Central)
Short Title: Operational Fatigue Modeling Validation
Responsible HRP Element: Human Factors and Behavioral Performance
Collaborating Org(s):
Funding Status: Active - Currently funded and in progress
Procurement Mechanism(s):

Software using mathematical models can help inform assessments related to work-rest schedules and implementation of fatigue countermeasures.  Branches of the military, for example, use the Sleep, Activity, Fatigue and Task Effectiveness (SAFTE) model to predict performance effectiveness relative to sleep-wake history.  Other relevant modeling efforts have included the development of the Circadian Performance Simulation Software (CPSS) by Brigham and Women’s Hospital, and the Individualized Fatigue Meter by Pulsar Informatics.  NASA, the National Space Biomedical Research Institute, and other agencies have supported the development of such software solutions to provide predictions of performance capability relative to sleep-wake history.   Software solutions can inform real-time task scheduling decisions and aid implementation of countermeasures such as caffeine and lighting – especially important, given that the proper scheduling of such countermeasures is essential to their effectiveness.


Mathematical models can therefore be used operationally in future space exploration missions, to inform the scheduling of mission-related tasks and the timing of fatigue-related countermeasures. This topic is soliciting proposals to evaluate the use of such a tool, as a means through which autonomous crews in a simulated spaceflight mission can appropriately implement fatigue-related countermeasures, and for understanding how a crew medical officer (who would be a participant in the study) and/or an individual crewmember will use the information to make countermeasure recommendations and real-time scheduling changes.

This task seeks to assess, in an operational environment (the Habitat Exploration Research Analog, or HERA, at Johnson Space Center), the acceptability, usability, and overall feasibility of sleep-wake models and associated software, to make informed decisions for long-duration space exploration missions (LDEMs), when ground support will be minimized and crews will function more autonomously.