actigraph

noun
ac·​ti·​graph | \ ˈak-tə-ˌgraf How to pronounce actigraph (audio) \

Medical Definition of actigraph

: a small device usually worn on the wrist that records the activity level of the body by sensing physical movement and that is used especially to measure the amount and quality of sleep 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

Note: An actigraph consists of an accelerometer and a memory unit and is used to collect data typically for a period of several days to one or two weeks.

Learn More about actigraph

Cite this Entry

“Actigraph.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/actigraph. Accessed 13 May. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Comments on actigraph

What made you want to look up actigraph? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Words Used by Nabokov Quiz

  • image1676440788
  • Choose the best definition or synonym for the word in bold: "There are some eructations that sound like cheers—at least, mine did." Lolita
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!