Monitor system for determining the sleep stages of a person
First Claim
1. A system for determining the sleep status of a person, which comprises:
- (a) means to measure the person'"'"'s cardiac R-R waves interval;
(b) means to calculate the power spectrum of the cardiac R-R interval, including means for calculating a ratio between spectral power in the slow and high frequencies;
(c) means responsive to said measuring and calculating means for generating output signals, one output signal having a first valve when said ratio is above a specific predetermined threshold, designated as REM sleep, and one output signal having a second value when the above ratio is below this threshold, designated as non-REM sleep; and
(d) means responsive to the output signals for designating a time period of predetermined duration as a REM period or a non-REM period, respectively.
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Abstract
A simple system for determining a non-invasive sleep state of a person is described. The system comprises: (a) means for measuring the person'"'"'s cardiac R-R waves interval; (b) means for calculating the power spectrum of the cardiac R-R interval, thus obtaining a ratio between spectral power in the and high frequencies; (c) means responsive to the measuring and calculating means for generating output signals, one output signal having a first value when said ratio is above a specific predetermined threshold, designated as REM sleep-and one outputs signal having a second value when the above ratio is below this threshold, designated as non-REM sleep, and (d) means responsive to the output signal for designating a time period of predetermined duration as a REM period or a non-REM period, respectively. The system enables an accurate determination of the sleep state.
149 Citations
10 Claims
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1. A system for determining the sleep status of a person, which comprises:
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(a) means to measure the person'"'"'s cardiac R-R waves interval; (b) means to calculate the power spectrum of the cardiac R-R interval, including means for calculating a ratio between spectral power in the slow and high frequencies; (c) means responsive to said measuring and calculating means for generating output signals, one output signal having a first valve when said ratio is above a specific predetermined threshold, designated as REM sleep, and one output signal having a second value when the above ratio is below this threshold, designated as non-REM sleep; and (d) means responsive to the output signals for designating a time period of predetermined duration as a REM period or a non-REM period, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification