Patent ID: 8021312
Filing Date: 2011-09-20
Classification: A61B

Abstract:
1. An arrangement for determining the physical activity level of a human being, the arrangement comprising: a movement sensor capable of being attached to an upper limb of the human being for measuring upper limb movements; and a processing unit connected to the movement sensor for filtering the upper limb movements during a determination period such that the upper limb movements measured during a predetermined threshold period following each accepted upper limb movement are rejected from the accepted upper limb movements, for forming the number of filtered upper limb movements during the determination period from the number of accepted upper limb movements during the determination period, for determining the physical activity level on the basis of the number of filtered upper limb movements during the determination period, and for recognizing filtered upper limb movements as a rhythmic activity if a number of intervals between subsequent filtered movements according to a predetermined number threshold value are equal with the accuracy of a predetermined variation threshold value and using the recognized rhythmic action in determining the physical activity level, wherein the processing unit is further configured to filter the filtered upper limb movements following one another more frequently than an extended threshold period if the processing unit did not recognize the filtered upper limb movements as a rhythmic activity and to use the doubly filtered upper limb movements in forming the number of movements and in determining the physical activity level.