Patent ID: 6770036
Filing Date: 2004-08-03
Classification: A61B

Abstract:
An apparatus for measuring an activity of autonomic nerve, comprising:a detector unit; a sympathetic nerve activity measuring unit; a parasympathetic nerve activity measuring unit; a memory unit; and an evaluation unit, wherein said detector unit detects a pulse wave of a person under test to produce a pulse wave signal, said sympathetic nerve activity measuring unit measures as an activity of the sympathetic nerve â€œ[LF/HF]meâ€  of the peak value â€œ[LF]meâ€  of the strength of the pulse wave signal within a low frequency band divided by the peak value â€œ[HF]meâ€  of the strength of the pulse wave signal within a high frequency band, said parasympathetic nerve activity measuring unit measures as an activity of the parasympathetic nerve the peak value â€œ[HF]meâ€  of the strength of the pulse wave signal within the high high frequency band, said memory unit stores reference data â€œ[HF]stâ€  and â€œ[LF/HF]stâ€ , and said evaluation unit compares the activity of the sympathetic nerve â€œ[LF/HF]meâ€  measured by said sympathetic nerve activity measuring unit with the reference data â€œ[LF/HF]stâ€  and the activity of the parasympathetic nerve â€œ[HF]meâ€  measured by said parasympathetic nerve activity measuring unit with the reference data â€œ[HF]stâ€  and, if the result of comparison is â€œ[HF]meâ€ >â€œ[HF]stâ€  and â€œ[LF/HF]meâ€ >â€œ[LF/HF]stâ€ , determines that there is a tendency of increased vivacity of the person under test, and evaluates a tendency of tension of the person as to whether it is higher or lower, based on the magnitude of difference between the values compared, if the result of comparison is â€œ[HF]meâ€ â€œ[LF/HF]stâ€ , determines that there is a tendency of increased tension of the person and evaluates a tendency of vivacity of the person as to whether it is higher or lower, based on the magnitude of difference between the values compared, and if the result of comparison is â€œ[HF]meâ€ >â€œ[HF]stâ€  and â€œ[HF]meâ€