different between actigraph vs actigraphy

English

actigraph (plural actigraphs)

(medicine) An accelerometer, worn by a sleeping subject, that records sleep activities.

actigraphy (uncountable)

The use of the actigraph to record the movements of a sleeping subject, and analyze the subject's sleep patterns.
- 2006, Steven Jones, Richard P. Bentall, The Psychology of Bipolar Disorder, Oxford University Press
  With actigraphy, the participant wears a wrist band with a small acceleration sensor that records movement over preset epochs.

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