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actigraph

   Also found in: Wikipedia 0.02 sec.
actigraph
[ak′tigraf′]
any instrument that records changes in the activity of a substance or an organism and produces a graphic record of the process, such as an electrocardiograph.


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But when the scientists measured sleep time using actigraphs, a wristwatch-like device that records movement and aids in calculating total sleep time, they found the men slept only 6.
For daily use by Science News
Parents estimates of sleep duration were longer than the actigraph measurements, which the researchers say could be because they measured from bedtime or because they assumed their children were asleep when they were simply lying awake in bed or reading.
Child behaviour linked to sleep by Balochistan Times (Baluchistan Province, Pakistan)
The children whose average sleep duration as measured by actigraphs was shorter than 7.
Little sleep could make kids hyperactive by Asian News International
 
 
 
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