2012 Fiscal Year Final Research Report

Reference Values of Anorectal Physiology Examinations in Japanese Normal Volunteers

Research Project

Project/Area Number	22591490
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Digestive surgery
Research Institution	Kochi University
Principal Investigator	MIMURA Toshiki 高知大学, 医学部附属病院, 特任教授 (20262131)
Project Period (FY)	2010 – 2012
Keywords	便失禁 / 機能性肛門直腸障害 / 基準値 / 正常値 / 直腸肛門機能検査 / 肛門内圧検査 / 直腸バルーン知覚検査 / 肛門超音波検査
Research Abstract	Reference values of anorectal examinations and endoanal ultrasonography have been obtained for Japanese population, which are categorized by gender and each decade of age between 20 and 90 years old. The anal canal is longer and both of the maximum resting pressure and the incremental voluntary squeeze pressure are higher in men than in women. Only the maximum resting pressure decreases with aging. Regarding the rectal balloon sensory examinations, no definite difference is observed depending on gender and age, whilst there is some tendency that the rectum is more sensitive in women than in men and that the sensation deteriorates with aging. The internal anal sphincter is thinner in men than in women, and thickens with aging, while there is no difference in its length depending on gender or age.

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