Method and system for ovulation detection in female's menstrual cycles based on heart rate variability analysis
AssigneeMing Chi University of Technology
InventorWei-Wen Hung
Life of this patent
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Abstract
This invention relates to a method and system for detecting ovulation in female's menstrual cycles, which involves collecting menstrual cycle information of a subject to calculate ovulation interval dates. Daily heart rate waveform signals are used to obtain heart rate-related physiological parameters, including the first cumulative power (LF), second cumulative power (HF), standard deviation of interbeat intervals (SDNN), root mean square of successive differences (RMSSD), cumulative power ratio (LF/HF), and heart rate parameter ratio (SDNN/RMSSD). The invention selects the day with the highest cumulative power ratio (LF/HF) and heart rate parameter ratio (SDNN/RMSSD) within the ovulation interval as the day of ovulation.
Claims10
A method for detecting ovulation in a female's menstrual cycle, comprising the steps of:
- (a) obtaining, with a computing device, the first day of a subject's menstrual cycle, longest cycle length and shortest cycle length;
- (b) calculating, with a computing device, an ovulation interval based on the longest and shortest cycle lengths;
- (c) measuring daily, with a heart rate waveform measuring device, a heart rate waveform signal of the subject;
- for each heart rate waveform signal:
- (d) from the heart rate waveform signal, determining, with the computing device, a first cumulative power (LF), a second cumulative power (HF), a standard deviation of interbeat intervals (SDNN), and a root mean square of successive differences (RMSSD), wherein a sampling frequency range of the second cumulative power is greater than that of the first cumulative power;
- and
- (e) determining, with the computing device, a cumulative power ratio (LF/HF) by dividing the first cumulative power by the second cumulative power, and a heart rate parameter ratio (SDNN/RMSSD) by dividing the standard deviation of interbeat intervals by the root mean square of successive differences;
- and
- (f) selecting, with the computing device, a day within the ovulation interval where both the cumulative power ratio (LF/HF) and the heart rate parameter ratio (SDNN/RMSSD) are at their maximum as the day of ovulation.
A system for detecting ovulation in a female's menstrual cycle, applicable to a subject, comprising:
- at least one heart rate waveform measuring device, configured for providing a heart rate waveform signal;
- and
- a computing device connected to the heart rate waveform measuring device, including:
- an input module, configured for inputting the first day of a menstrual cycle, and longest and shortest cycle lengths;
- a first calculating module, configured for calculating an ovulation interval based on the first day, and the longest and shortest cycle lengths;
- a second calculation module, configured for calculating a first cumulative power (LF), a second cumulative power (HF), a standard deviation of interbeat intervals (SDNN), a root mean square of successive differences (RMSSD), a cumulative power ratio (LF/HF), and a heart rate parameter ratio (SDNN/RMSSD) based on the heart rate waveform signal;
- and
- a third calculation module, configured for selecting an ovulation day within the ovulation interval based on the cumulative power ratio (LF/HF) and the heart rate parameter ratio (SDNN/RMSSD), wherein the third calculation module selects a day with the maximum values of both ratios as the ovulation day.
Dependencies are inferred from the claim text.