Last Published:  07/31/19 10:05:30 AM (Central)
Responsible Element: Human Factors and Behavioral Performance (HFBP)
Status: Open


a)    Initial State

Two inflight investigations - Sleep-Wake Actigraphy and Reaction Self-Test – have furthered the development and validation of two needed measures. Limitations have arisen, however. While the Actiwatch has been validated on orbit, there is a need for a sleep duration measure that minimizes human resource requirements (as evidenced by the decision to not transition the current Actiwatch technology to operations owing to the crew time hit). Additionally, the PVT is being tested in flight, but this tool still requires crew time and may not be feasible to use in such situations as a prolonged EVA. While the PVT serves as the ‘gold standard’ for measuring fatigue, determining the predictive validity of this tool with operational task performance is still recommended.

b)    Target for Closure

An integrated suite of minimally obtrusive tools that have been verified (meets functional requirements) and validated (content, construct, and where applicable, criterion-related validity), as well as evaluated for feasibility and acceptability in high fidelity ground analogs and/or spaceflight, to monitor and measure sleep and associated changes to performance and cognitive function unobtrusively, while providing operationally relevant feedback related to sleep and/or performance.

c)    Metrics for Interim Progress

(1) Identify candidate measures of sleep-wake activity and performance that minimize human resource requirements (5%);
(2) Vet with stakeholders (5%);
(3) Complete studies to verify and validate candidate tools in analogs to assess effectiveness, feasibility and acceptability (as needed) (20%);
(4) collaborate with SHFE and sensorimotor on identification and testing of tools with those that evaluate operational task performance in flight (20%);
(5) Validate in high fidelity analogs and/or spaceflight alongside traditional measures, to demonstrate effectiveness, feasibility and acceptability (20%);
(6) report on validated tools linked to contributors that can be used to monitor, measure, detect and assess decrements in sleep and performance (10%);
(7) As described in Sleep Gap 10, define thresholds, ranges and clinical guidelines for helping make the output from these measures useful operationally (10%).

d)    Approach

This gap addresses the need for multiple tools:  those that assess sleep-wake activity, and performance (cognitive and operational). Remaining work in this gap is specific to a validated measure(s) that requires minimal crew time, is feasible prior to performing a critical task such as an EVA or lunar surface rover mission, and provides real time feedback about fatigue and predicted performance levels. Cognitive measures that fit these criteria should then be validated as predictors of operational task performance before the gap can be considered adequately mitigated. If resources were available, the gap could be closed within five years.

Target for Closure
No Target for Closure available.
Risk Risk of Performance Decrements and Adverse Health Outcomes Resulting from Sleep Loss, Circadian Desynchronization, and Work Overload
You are here! Gap Sleep Gap 1: We need to identify a set of validated and minimally obtrusive tools to monitor and measure sleep-wake activity and associated performance changes for spaceflight.

No Documentation Available