Method and system for activity/rest identification
First Claim
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1. A method for identification of activity and rest periods based on an actigraphy signal, said method comprising:
- (a) applying one or more filters to said actigraphy signal to generate a filtered actigraphy signal using a processing hardware element; and
(b) comparing said filtered actigraphy signal against an adaptive threshold based on the expected number of sleep hours implemented using a percentile of said actigraphy signal to generate an output signal corresponding to said activity and rest periods.
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Abstract
Disclosed embodiments include a method for automatic identification of activity and rest periods based on an actigraphy signal. According to an embodiment, the method comprises (a) applying one or more filters to the actigraphy signal to generate a filtered actigraphy signal, and (b) comparing the filtered actigraphy signal against an adaptive threshold to generate an output signal corresponding to the activity and rest periods. The method can be implemented as part of a medical apparatus or medical system for automatic activity/rest identification from actigraphy signals.
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Citations
14 Claims
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1. A method for identification of activity and rest periods based on an actigraphy signal, said method comprising:
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(a) applying one or more filters to said actigraphy signal to generate a filtered actigraphy signal using a processing hardware element; and (b) comparing said filtered actigraphy signal against an adaptive threshold based on the expected number of sleep hours implemented using a percentile of said actigraphy signal to generate an output signal corresponding to said activity and rest periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A medical system for identification of activity and rest periods based on an actigraphy signal, said medical system comprising a processor configured to perform the processing steps of:
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(a) applying one or more filters to said actigraphy signal to generate a filtered actigraphy signal; and (b) comparing said filtered actigraphy signal against an adaptive threshold based on the expected number of sleep hours implemented using a percentile of said actigraphy signal to generate an output signal corresponding to said activity and rest periods. - View Dependent Claims (11, 12)
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13. An apparatus for identification of activity and rest periods, comprising:
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(a) a sensor configured for acquiring actigraphy signals; and (b) a processor configured for pocking said actigraphy signals by
1) applying one or more filters to said actigraphy signal to generate a filtered actigraphy signal, and
2) comparing said filtered actigraphy signal against an adaptive threshold based on the expected number of sleep hours implemented using a percentile of said actigraphy signal corresponding to (hs/24)×
100% where hs is a user-specified parameter corresponding to an average number of sleep hours per night to generate and report an output signal corresponding to said activity and rest periods, wherein said one or more filters comprise a median rank-order filter with user-specified window lengths up to 12 hours and a closing-opening morphological filter configured to eliminate invalid sleep-awake and awake-sleep transitions, and padding said actigraphy signal prior to said applying one or more filters at its beginning and end using the maximum value of said actigraphy signal in order to bias its beginning and end towards an awake state. - View Dependent Claims (14)
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Specification