Apparatus and method for monitoring biological information, and computer program product
A biological-information monitoring apparatus includes a detecting unit that detects pulse intervals of a target person. Moreover, a first calculating unit calculates an average pulse interval that is an average of the pulse intervals within a first period. The first period is decided based on a target pulse interval. Finally, a second calculating unit calculates a parasympathetic nervous index based on a difference between the average pulse interval and the target pulse interval.
1. A biological-information monitoring apparatus comprising:
a detecting unit that detects pulse intervals of a target person;
a first calculating unit that calculates an average of the pulse intervals within a first period, wherein the first period is determined based on a target pulse interval; and
a second calculating unit that calculates a parasympathetic nervous index based on a difference between the average pulse interval and the target pulse interval.
2. The apparatus according to claim 1 , wherein the second calculating unit calculates the parasympathetic nervous index based on any one of
an average of square values of differences between the average pulse interval and the target pulse interval within a second period, and
an average of absolute values of differences between the average pulse interval and the target pulse interval within a second period.
3. The apparatus according to claim 1 , wherein the first calculating unit averages the pulse intervals in a series monitored within the first period immediately before the target pulse interval.
4. The apparatus according to claim 1 , wherein the first calculating unit averages the pulse intervals in a series monitored within the first period immediately after the target pulse interval.
5. The apparatus according to claim 1 , wherein the first calculating unit sets the first period based on a breathing cycle of the target person.
6. The apparatus according to claim 1 , further comprising a determining unit that determines, based on the parasympathetic nervous index, transitions of a sleep state of the target person.
7. The apparatus according to claim 1 , further comprising a monitoring unit that monitors a cardiac potential of the target person, wherein
the detecting unit detects the pulse intervals based on the cardiac potential.
8. The apparatus according to claim 1 , further comprising a monitoring unit that monitors a pressure due to a body of the target person, wherein
the detecting unit detects the pulse intervals based on the pressure.
9. The apparatus according to claim 1 , further comprising an imaging unit that captures images of the target person at different time points, wherein
the detecting unit detects the pulse intervals based on changes in the images.
10. A computer-implemented method of monitoring and processing biological information of a target person, the method comprising:
detecting pulse intervals of the target person based on a pulse sensor;
calculating an average pulse interval that is an average of the pulse intervals within a first period, wherein the first period is decided based on a target pulse interval; and
calculating a parasympathetic nervous index based on a difference between the average pulse interval and the target pulse interval.
11. A computer product including a recording medium readable by a computer and containing a plurality of instructions executable on the computer for monitoring and processing of biological information, the instructions causing the computer to execute:
detecting pulse intervals of a target person;
calculating an average pulse interval that is an average of the pulse intervals within a first period, wherein the first period is decided based on a target pulse interval; and
calculating a parasympathetic nervous index based on a difference between the average pulse interval and the target pulse interval.