Currently, the International Space Station (ISS) uses General Luminaire Assemblies (GLAs) that house fluorescent lamps for illuminating the astronauts’ working and living environments. NASA has determined that, beginning in 2016, the GLAs will be replaced with Solid-State Light Assemblies (SSLAs) containing Light Emitting Diodes (LEDs). Engineers at Kennedy Space Center developed a prototype Solid-State Lighting Assembly (SSLA) that was successfully installed onboard the ISS during ISS Expedition 18. The investigators worked with engineers, scientists, and managers from Johnson Space Center (JSC) to revise the SSLA specifications so that the new lighting units would have a dual capacity to: 1) provide illumination for crewmembers’ working and living quarters, and 2) serve as a lighting countermeasure for crewmembers’ circadian and sleep disruption.
Once the new SSLAs are deployed on the ISS, the investigators plan to assess the acceptability, use, and impact of deployment of a dynamic lighting schedule aboard the ISS during operational flight missions on astronaut vision, sleep, alertness, circadian rhythms, and general well-being. Sleep, performance, and circadian rhythm data will be compared to those collected by their team and others during previous flight missions aboard the ISS, in addition to surveillance of medical and psychological health in collaboration with mission flight surgeons. This project will generate quantitative data and knowledge for the benefit of crew health, habitability, environment, and human factors in the design of future human space flight vehicles and habitats. The project also will provide guidance for flight surgeons, flight psychologists, and astronauts to help optimize sleep and circadian regulation during space exploration missions.
Subjects will perform two preflight sessions and one post-flight session. Data collection at each time point will consist of the following: a) Two-week actigraphy and sleep log sessions, b) 48-hour urine collection, and c) three Cognition sessions spread throughout a testing day. Visual performance tests will be performed once pre-flight and once post-flight. Sleep Logs will be completed every morning beginning the morning after the Actiwatch Spectrum is donned. Two in-flight sessions are required, with one occurring after a period of standard crew sleep, and one after a crew sleep shift. Data collection at each time point consists of: a) Two-week actigraphy and sleep log sessions, b) 24-hour urine collection, and c) three Cognition sessions spread throughout a testing day. Additionally, visual performance tests and a series of light meter readings will be completed under each of the SSLA settings and under a GLA.
This study is in progress. Results will be available at a later date.
|Mission||Launch/Start Date||Landing/End Date||Duration|
|Expedition 50||10/28/2016||04/09/2017||164 days|
|Expedition 51||04/09/2017||06/02/2017||55 days|
|Expedition 52||06/02/2017||09/02/2017||92 days|
|Expedition 53||09/02/2017||12/14/2017||102 days|
|Expedition 54||12/14/2017||02/27/2018||75 days|
|Expedition 55||02/27/2018||06/03/2018||96 days|
|Expedition 56||06/03/2018||10/04/2018||123 days|
|Expedition 57||10/04/2018||12/20/2018||77 days|
|Expedition 58||12/18/2018||03/14/2019||85 days|
|Expedition 59||03/14/2019||In progress|