Method of estimating glucose metabolic capacity

1 . A method executed by a biological information measurement system, the method comprising:

before an event that affects a blood glucose level of a user, calculating a first peripheral hemodynamic index value of the user based on a pulse wave feature quantity determined from a pulse wave signal measured by a pulse wave sensor, the pulse wave feature quantity being at least one of a peak time differences of respective peaks, a height of each peak, a ratio of a peak time difference of each peak to a pulse interval, a peak half width, a ratio between an area on a positive side and an area on a negative side of an acceleration pulse wave signal;

after the event that affects the blood glucose level of the user, calculating a second peripheral hemodynamic index value of the user based on the pulse wave feature quantity determined from the pulse wave signal measured by the pulse wave sensor; and

estimating a glucose metabolic capacity of the user based on a change between the first peripheral hemodynamic index value and the second peripheral hemodynamic index value.

2 . The method according to claim 1 , wherein calculating the first peripheral hemodynamic index value and calculating the second peripheral hemodynamic index value includes calculating at a plurality of times continuously or intermittently from before the event to after the event.

3 . The method according to claim 1 , further comprising determining that the user has a low glucose metabolic capacity when the change between the first peripheral hemodynamic index value and the second peripheral hemodynamic index value of the user is below a given value in mg/dL.

4 . The method according to claim 1 , wherein calculating the first peripheral hemodynamic index value of the user and calculating the second peripheral hemodynamic index value of the user includes measuring the user at a measurement position where a height from a heart of the user is identical.

5 . The method according to claim 1 , further comprising:

measuring a skin temperature of a peripheral body part of the user; and

correcting the first peripheral hemodynamic index value or the second peripheral hemodynamic index value of the user according to the skin temperature.

6 . The method according to claim 1 , further comprising:

estimating a pulse interval of the user;

calculating an index value of an autonomic nerve function of the user from a variation of the pulse interval; and

correcting the first peripheral hemodynamic index value of the user or the second peripheral hemodynamic index value of the user according to the index value of the autonomic nerve function.

7 . The method according to claim 1 , further comprising:

measuring a photoplethysmographic signal at a peripheral body part of the user; and

calculating the first peripheral hemodynamic index value of the user or the second peripheral hemodynamic index value of the user from a feature quantity of the photoplethysmographic signal.

8 . The method according to claim 1 , further comprising:

before the event that affects the blood glucose level of the user, measuring a first blood glucose value of the user;

after the event that affects the blood glucose level of the user, measuring a second blood glucose value of the user; and

estimating a glucose metabolic capacity of the user based on the change between the first peripheral hemodynamic index value and the second peripheral hemodynamic index value, and a change between the first blood glucose value and the second blood glucose value.