Body fat measuring device capable of accurately measuring visceral fat amount

1. A body fat measuring device comprising:

at least one pair of first electrodes configured to be disposed respectively at a first site and a second site, wherein the first site and the second site are located away from an abdomen of a subject, and said abdomen is located between the first site and the second site;

an electrode group including a first abdomen electrode configured to be disposed at a surface of the abdomen of said subject,

said first abdomen electrode including a pair of second electrodes and a pair of third electrodes disposed in an alignment direction substantially perpendicular to a cross section of said abdomen;

an applying portion for alternately applying electric current to said subject via said first electrodes and said third electrodes;

a detecting portion for alternately detecting a first potential difference between the pair of second electrodes when the electric current is applied via said first electrodes, and a second potential difference between the pair of second electrodes when the electric current is applied via said third electrodes; and

a visceral fat amount calculating portion for calculating a visceral fat amount of said subject based on said detected first and second potential differences and physical data of said subject.

2. The body fat measuring device according to claim 1 , wherein

said third electrodes are disposed at respective positions sandwiching said second electrodes in said alignment direction.

3. The body fat measuring device according to claim 1 , wherein

said electrodes of said one predetermined pair are said second electrodes.

4. The body fat measuring device according to claim 1 , wherein

said electrodes of said one predetermined pair are electrodes that are included in said first abdomen electrode and that are electrodes of a pair other than the pair of said second electrodes.

5. The body fat measuring device according to claim 4 , wherein

said third electrodes are disposed at respective positions sandwiching said second electrodes in said alignment direction, and

said electrodes of said one predetermined pair are said third electrodes.

6. The body fat measuring device according to claim 1 , further comprising an impedance calculating portion for calculating two types of impedances based on said first potential difference and said second potential difference respectively, wherein

said visceral fat amount calculating portion calculates said visceral fat amount based on said calculated two types of impedances and said physical data of said subject.

7. The body fat measuring device according to claim 6 , wherein

said visceral fat amount calculating portion calculates said visceral fat amount using a predetermined correlation formula of a relation between said two types of impedances, said physical data and said visceral fat amount.

8. The body fat measuring device according to claim 1 , further comprising a display portion for displaying said calculated visceral fat amount.

9. The body fat measuring device according to claim 1 , further comprising a subcutaneous fat amount calculating portion for calculating a subcutaneous fat amount of said subject based on said detected second potential difference and said physical data of said subject.

10. The body fat measuring device according to claim 1 , wherein

said physical data includes at least one of circumference of the abdomen, lateral width of the abdomen, thickness of the abdomen, height, and weight of said subject.

11. The body fat measuring device according to claim 1 , wherein

said first site and said second site include an upper limb and a lower limb respectively.

12. The body fat measuring device according to claim 1 , wherein

said electrode group further includes a second abdomen electrode,

said second abdomen electrode includes fourth electrodes and fifth electrodes disposed substantially parallel with said alignment direction and corresponding respectively to said second electrodes and said third electrodes,

said applying portion further applies electric current to said subject via said fifth electrodes,

said detecting portion further detects a third potential difference between said fourth electrodes in a case where electric current is applied via said fifth electrodes, and

said visceral fat amount calculating portion calculates said visceral fat amount by averaging said second potential difference and said third potential difference.

13. The body fat measuring device according to claim 1 , wherein

said first abdomen electrode further includes a pair of sixth electrodes,

said detecting portion further detects a fourth potential difference between said sixth electrodes in said second case, and

said visceral fat amount calculating portion calculates said visceral fat amount by averaging said second potential difference and said fourth potential difference.

14. The body fat measuring device according to claim 1 , wherein

said first abdomen electrode includes a first surface contacting the surface of said abdomen and a second surface opposite to said first surface, and

said body fat measuring device further comprises a sheet material where said second surface is fixed.

15. The body fat measuring device according to claim 14 , wherein

said sheet material includes positioning means corresponding to a navel position of said subject.

16. The body fat measuring device according to claim 15 , wherein

said positioning means is a mark placed at a predetermined position of said sheet material.

17. The body fat measuring device according to claim 15 , wherein

said positioning means is a hole opened at a predetermined position of said sheet material.

18. A measuring unit controlled by an operation unit calculating a visceral fat amount, for measuring a potential difference generated at a body surface of a subject in a state where electric current is applied to said subject, said measuring unit comprising:

at least one pair of first electrodes configured to be disposed respectively at a first site and a second site, wherein the first site and the second site are located away from an abdomen of the subject, and said abdomen is located between the first site and the second site;

an electrode group including a first abdomen electrode configured to be disposed at a surface of the abdomen of said subject,

said first abdomen electrode including a pair of second electrodes disposed in an alignment direction substantially perpendicular to a cross section of said abdomen and a pair of third electrodes disposed at respective positions sandwiching said second electrodes in said alignment direction;

an applying portion for alternately applying electric current to said subject via said first electrodes and said third electrodes based on a signal from said operation unit;

a detecting portion for alternately detecting a first potential difference between the pair of second electrodes when the electric current is applied via said first electrodes, and for detecting a second potential difference between the pair of second electrodes when the electric current is applied via said third electrodes; and

a transmitting portion for transmitting to said operation unit data concerning said detected first and second potential differences.

19. A body fat measuring program product for controlling a measuring unit including an electric current applier for applying electric current to a subject and a detector for detecting a potential difference generated at a body surface of said subject in a state where the electric current is applied to said subject, and causing a computer to execute a body fat measuring process based on a result of measurement by said measuring unit, said body fat measuring program product causing the computer to execute the steps of:

causing said electric current applier to apply electric current via at least one pair of out-of-abdomen electrodes disposed away from an abdomen of said subject and sandwiching said abdomen;

causing said detector to detect a first potential difference between a pair of second abdomen electrodes that is one predetermined pair among four electrodes disposed at a surface of said abdomen and disposed in an alignment direction substantially perpendicular to a cross section of said abdomen, when the electric current is applied via said out-of-abdomen electrodes;

causing said electric current applier to apply electric current via a pair of first abdomen electrodes located on an outer side among said four electrodes;

causing said detector to alternately detect a second potential difference between the pair of second abdomen electrodes when the electric current is applied via said first abdomen electrodes;

obtaining said detected first and second potential differences; and

calculating a visceral fat amount of said subject based on said obtained first and second potential differences and physical data of said subject.

20. A method of controlling a body fat measuring device by controlling a measuring unit including an electric current applier for applying electric current to a subject and a detector for detecting a potential difference generated at a body surface of said subject in a state where the electric current is applied to said subject, for causing said body fat measuring device including said measuring unit to execute a body fat measuring process, the method comprising the steps of:

causing said electric current applier to apply electric current via at least one pair of out-of-abdomen electrodes disposed away from an abdomen of said subject and sandwiching said abdomen;

causing said detector to detect a first potential difference between a pair of second abdomen electrodes that is one predetermined pair among four electrodes disposed at a surface of said abdomen and disposed in an alignment direction substantially perpendicular to a cross section of said abdomen, when the electric current is applied via said out-of-abdomen electrodes;

causing said electric current applier to apply electric current via a pair of first abdomen electrodes located on an outer side among said four electrodes;

causing said detector to alternately detect a second potential difference between the pair of second abdomen electrodes when the electric current is applied via said first abdomen electrodes;

obtaining said detected first and second potential differences; and

calculating a visceral fat amount of said subject based on said obtained first and second potential differences and physical data of said subject.