medical Definition of actigraph
- Researchers measured the sleep time of 2,978 women by equipping them with an actigraph, a watch-size device worn on the wrist that measures periods of activity and inactivity.
- —Nicholas Bakalar, The New York Times, 16 Sept. 2008
- Actigraph data accurately identify periods of sleep and wakefulness and yield estimates of movement, the researchers say.
- —Bruce Bower, Science News, 20 May 2000