- n. small electronic device used to monitor and record a certain activity in a person over a specific period of time (such as heart rate, respiration, body temperature, etc.)
English contemporary dictionary. 2014.
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Actigraphy — is a relatively non invasive method of monitoring human rest/activity cycles. A small actigraph unit, also called an actimetry sensor, [cite journal | last = Pigot | first = Hélène | coauthors = Bernard Lefebvre, Jean Guy Meunier, Brigitte… … Wikipedia