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Abstract

The process of determining a criterion of activity of a sensor used to measure a parameter of enslavement in an active implantable medical device. The process is characterized by the following steps: a) acquisition of successive samples of the representative value of the parameter from a signal collected by the sensor, b) calculation over a first interval of time of a first average value (AVE.sub.-- SENSOR.sub.-- SHORT.sub.-- TERM) of the activity from the samples acquired by the sensor; c) calculation over a second interval of time, greater than the first, of a second average value (AVE.sub.-- SENSOR.sub.-- 24H) of the activity of the sensor from acquired samples, and d) determination of a criterion of activity of the sensor, by comparison of the first average value and the second average value, notably by giving to the criterion of activity a first value (Rest) defining a state of rest of the patient if the first average value (AVE.sub.-- SENSOR.sub.--SHORT.sub.-- TERM) is less than the second average value (AVE.sub.--SENSOR.sub.-- 24H), and a second value (Non-Rest) defining a state of non-rest of the patient in the opposite case.

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