HORMONAL HEALTH COACHING BASED ON CARDIAC AMPLITUDE

1 . A computer program product comprising computer executable code embodied in a non-transitory computer readable medium that, when executing on one or more computing devices, causes the one or more computing devices to perform the steps of:

providing a model for a cardiovascular amplitude metric that characterizes timewise changes in a cardiac metric of a user during a model hormonal cycle based on an offset between (a) a follicular mean over a first interval of at least three sequential daily measurements of resting heart rate or heart rate variability that includes day five of the model hormonal cycle and (b) a luteal mean over a second interval of at least three sequential daily measurements of a resting heart rate or a heart rate variability that includes day twenty five of the model hormonal cycle;

acquiring heart rate data for the user from a wearable photoplethysmography monitor during a user hormonal cycle;

calculating the cardiovascular amplitude metric of the user for the user hormonal cycle with the model for the cardiovascular amplitude metric; and

providing feedback to the user based on the cardiovascular amplitude metric.

2 . The computer program product of claim 1 , wherein providing feedback to the user includes displaying the cardiovascular amplitude metric to the user.

3 . The computer program product of claim 1 , wherein providing feedback to the user includes:

estimating a phase of the user in a current hormonal cycle;

determining a confidence level for the phase based on the cardiovascular amplitude metric; and

reporting the confidence level for the phase to the user.

4 . The computer program product of claim 1 , wherein providing feedback to the user includes providing fertility coaching.

5 . The computer program product of claim 4 , wherein providing fertility coaching includes:

estimating a phase of the user in a current hormonal cycle;

calculating an ovulation time of the user based on the phase; and

reporting a confidence level in the ovulation time to the user based on the cardiovascular amplitude metric.

6 . The computer program product of claim 4 , wherein providing fertility coaching includes reporting a likelihood of conception to the user.

7 . The computer program product of claim 4 , wherein providing fertility coaching includes providing suggestions for one or more behavioral modifications to increase the cardiovascular amplitude metric.

8 . The computer program product of claim 4 , wherein providing fertility coaching includes:

determining a phase of the user based on data from the wearable photoplethysmography monitor;

storing one or more ovulation observations by the user in a memory;

predicting an ovulation time for the user based on a combination of the phase of the user and the one or more ovulation observations; and

providing a fertility coaching recommendation to the user including the ovulation time, a likelihood to conceive based on the cardiovascular amplitude metric, and an accuracy of the ovulation time based on the cardiovascular amplitude metric.

9 . The computer program product of claim 1 , wherein providing feedback includes providing an indicator to the user of a possible onset of perimenopause or menopause.

10 . A method comprising:

providing a model for a cardiovascular amplitude metric that characterizes timewise changes in a cardiac metric for a user based on an offset between a follicular mean of the cardiac metric and a luteal mean of the cardiac metric;

acquiring physiological data for the user from a wearable monitor during a hormonal cycle, wherein the physiological data includes heart rate data for the user;

calculating the cardiovascular amplitude metric of the user with the model for the hormonal cycle based on the physiological data; and

providing feedback to the user based on the cardiovascular amplitude metric.

11 . The method of claim 10 , wherein providing feedback to the user includes displaying the cardiovascular amplitude metric to the user.

12 . The method of claim 10 , wherein providing feedback to the user includes providing fertility coaching.

13 . The method of claim 12 , wherein providing fertility coaching includes:

estimating a phase of the user in a current hormonal cycle;

calculating an ovulation time of the user based on the phase; and

reporting a confidence level in the ovulation time to the user based on the cardiovascular amplitude metric.

14 . The method of claim 12 , wherein providing fertility coaching includes reporting a likelihood of conception to the user.

15 . The method of claim 12 , wherein providing fertility coaching includes:

determining a phase of the user based on data from the wearable monitor;

storing one or more ovulation observations by the user in a memory;

predicting an ovulation time for a user based on a combination of the phase of the user and the one or more ovulation observations; and

providing a fertility coaching recommendation to the user including the ovulation time, a likelihood to conceive based on the cardiovascular amplitude metric, and an accuracy of the ovulation time based on the cardiovascular amplitude metric.

16 . The method of claim 10 , wherein the follicular mean includes a first mean of a first sequence of cardiac measurements over a first interval around an expected follicular turning point of the cardiac metric for the user, and wherein the luteal mean includes a second mean of a second sequence of cardiac measurements over a second interval around an expected luteal turning point of the cardiac metric for the user.

17 . The method of claim 16 , wherein:

the cardiac metric includes a resting heart rate;

the expected follicular turning point of the cardiac metric occurs on day five of the hormonal cycle;

the expected follicular turning point is a minimum of the resting heart rate;

the first interval is at least seven days;

the expected luteal turning point of the cardiac metric occurs on day twenty five of the hormonal cycle;

the expected luteal turning point is a maximum of the resting heart rate; and

the second interval is at least seven days.

18 . The method of claim 16 , wherein:

the cardiac metric includes a heart rate variability;

the expected follicular turning point of the cardiac metric occurs on day five of the hormonal cycle;

the expected follicular turning point is a maximum of the heart rate variability; and

the first interval is at least three days.

19 . The method of claim 16 , wherein:

the cardiac metric includes a heart rate variability;

the expected luteal turning point of the cardiac metric occurs on day twenty five of the hormonal cycle;

the expected luteal turning point is a minimum of the heart rate variability; and

the second interval is at least three days.

20 . A system comprising:

a wearable physiological monitor configured to acquire cardiac data from a user;

a memory storing a model for a cardiovascular amplitude metric that characterizes timewise changes in a cardiac metric of a user during a model hormonal cycle, wherein the model is based on an offset between a first mean of a first interval of measurements around an expected follicular turning point of the cardiac metric for the user and a second mean of a second interval of measurements around an expected luteal turning point of the cardiac metric for the user; and

a processor configured by computer executable code to receive data from the wearable physiological monitor over a hormonal cycle for the user, calculate the cardiovascular amplitude metric for the hormonal cycle, and generate feedback to the user based on the cardiovascular amplitude metric.

21 - 25 . (canceled)