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Spaceflight Standard Measures: Actigraphy (SSM_Actigraphy)
Principal Investigator
Research Area:
Behavior and performance
Species Studied
Scientific Name: Homo sapiens Species: Human


Actigraphy is one of nine Spaceflight Standard Measures conducted on International Space Station (ISS) crewmembers. Spaceflight Standard Measures are a collection or set of core measurements, representative of many of the human spaceflight risks, collected on astronauts before, during and after International Space Station (ISS) missions. The purpose of this project is to populate a repository with data that enables high-level monitoring of countermeasure effectiveness and meaningful interpretation of health and performance outcomes, as well as support future, hypothesis-driven research that enables planetary missions, as well as, optimized minimal set of measures captured from all ISS crewmembers until the end of the ISS program. These measures will serve the population as a data repository and be available to other studies under data sharing agreements, as well as, undergo analysis for trends in the astronaut population.

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Circadian rhythm
Behavioral Health and Performance

Bed time
Number of awakenings
Sleep efficiency
Sleep onset latency
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Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
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 06/24/2019 102 days
Expedition 60 06/24/2019 10/03/2019 101 days
Expedition 61 10/03/2019 02/06/2020 126 days

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Institutional Support
National Aeronautics and Space Administration (NASA)
Alternate Experiment Name
Proposal Date
Proposal Source