System and method for determining changes in a body state
AssigneeHonda Motor Co., Ltd.
InventorsKin C. Fung, Timothy J. Dick, Charles William Hall, Jr.
Life of this patent
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Abstract
A method and a system for determining changes in a body state of an individual including receiving a signal from a monitoring system, where the signal indicates a measurement of cardiac activity of the individual over a period of time and determining at least one signal feature, where the signal feature is a reoccurring event of the signal over the period of time. The method also includes determining a first interval between two successive signal features and determining a second interval between two successive first intervals. A derivative is calculated based on the second interval. Changes in the body state are identified based on the derivative.
Claims23
A computer-implemented method for determining changes in a body state of an individual, comprising:
- receiving a signal from a monitoring system, the signal indicating a measurement of cardiac activity over a period of time;
- identifying a signal feature that repeats in the signal over the period of time;
- calculating a plurality of first intervals, wherein each first interval in the plurality of first intervals is calculated between successive signal features in the signal;
- calculating a plurality of second intervals, wherein each second interval in the plurality of second intervals is calculated between successive first intervals in the plurality of first intervals;
- calculating a derivative based on the plurality of second intervals;
- and
- identifying changes in the body state based on the derivative.
A computer-implemented method for analyzing transitions in a body state, comprising:
- receiving a signal from an individual indicating a measurement of cardiac activity over a period of time, wherein the signal includes a signal feature that repeats in the signal;
- calculating a plurality of first intervals, wherein each first interval in the plurality of first intervals is calculated between successive signal features in the signal;
- calculating a plurality of second intervals, wherein each second interval in the plurality of second intervals is calculated between successive first intervals in the plurality of first intervals;
- calculating a derivative based on the plurality of second intervals;
- extracting a plurality of heart rate accelerations or decelerations based on the derivative;
- and
- identifying a transition in the body state based on the plurality of heart rate accelerations or decelerations.
A computer system for determining changes in a body state of an individual, comprising:
- a monitoring system configured to monitor cardiac activity;
- a signal receiving module configured to receive a signal from the monitoring system, the signal representing a measurement of cardiac activity over a period of time;
- a feature determination module configured to identify signal features that reoccur in the signal over the period of time;
- an interval determination module configured to calculate respective first intervals between successive signal features and respective second intervals between successive first intervals;
- a derivative calculation module configured to calculate a derivative of a heart rate based on the second intervals;
- and
- an identification module configured to identify changes in the body state based on the derivative.
A non-transitory computer-readable medium storing computer-executable instructions that when executed by a computer, which includes at least a processor, cause the computer to perform a method, the method comprising:
- receiving, using at least the processor, a signal indicating a plurality of cardiac cycles of an individual over a period of time;
- detecting, using at least the processor, a signal feature, wherein the signal feature is a reoccurring event in the signal over the period of time;
- calculating, using at least the processor, a plurality of first intervals, wherein each first interval in the plurality of first intervals is calculated between successive signal features;
- calculating, using at least the processor, a plurality of second intervals, wherein each second interval in the plurality of second intervals is calculated between successive first intervals in the plurality of first intervals;
- calculating, using at least the processor, a derivative based on the plurality of second intervals;
- and
- identifying, using at least the processor, changes in a body state based on the derivative.
Dependencies are inferred from the claim text.