Actiwatch (Actiwatch) - 07.29.14
ISS Science for Everyone
Science Objectives for Everyone
The Actiwatch is a waterproof, nonintrusive, sleep-wake activity monitor worn on the wrist of a crewmember. The device contains a miniature uniaxial accelerometer that produces a signal as the subject moves. The data are stored in nonvolatile memory within the Actiwatch until they are downloaded for analysis.
Science Results for Everyone
Cambridge Neurotechnology Ltd., Cambridge, MA, United Kingdom
Sponsoring Space Agency
National Aeronautics and Space Administration (NASA)
Human Exploration and Operations Mission Directorate (HEOMD)
ISS Expedition Duration
September 2006 - March 2011
Previous ISS Missions
The Actiwatch has supported investigations on several space shuttle missions.
- The Actiwatch monitor provides data on the amount of ambient light the subject is exposed to and the amount of movement produced by the subject.
- The data collected from the Actiwatch is used to determine if space travel has an impact on the sleep-wake patterns of crewmembers.
- Crewmembers wear Actiwatches for a period specified by the investigators.
- The Actiwatch records wrist activity, allowing investigators to estimate the crewmember's activity, and records the amount of light the crewmember is exposed to.
Ground Based Results Publications
Mallis MM, DeRoshia CW. Circadian Rhythms, Sleep, and Performance in Space. Aviation, Space, and Environmental Medicine. 2005; 76(6 Suppl): B94-107.
Monk TH, Buysse DJ, Billy BD. Using daily 30-min phase advances to achieve a 6-hour advance: Circadian rhythm, sleep, and alertness. Aviation, Space, and Environmental Medicine. 2006 Jul; 77(7): 677-686. PMID: 16856351.
NASA Image: S109E6062: View of STS-109 Commander Scott Altman activating the Actiwatch while seated at the pilot's station on the orbiter Columbia's forward flight deck.
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