S

T

U

ST

Influence of Body Position on Defecation in Humans

Department of Internal Medicine, Division of Neurology, Sakura Medical Center, Toho University, Sakura, Japan,

Department of Urology, Tokyo Women’s Medical University, Tokyo, Japan,

Aishin Seiki Inc., Tokyo, Japan,

Clinical Physiology Unit, Sakura Medical Center, Toho University, Sakura, Japan,

Department of Radiology, Sakura Medical Center, Toho University, Sakura, Japan,

Department of Neurology, Chiba University, Chiba, Japan, and

Department of Urology, Dokkyo Medical College, Tochigi, Japan

Chairman:Dr.Hung-Chi YangPresenter:Bee-Yen LimAdviser:Dr. Yi-Chun Du

1

Outline

٥ Introduction٥ Purposes٥ Material and Methods٥ Results٥ Discussion and Conclusions٥ References

2

Introduction

٥ Normal defecation is thought to necessitate three components:• spontaneous phasic rectal contraction that

starts during storage(autonomic component) • relaxation of the anal canal with an enlarged

anorectal angle • straining (somatic component)

3

Purposes

٥ To compare three positions for defecation by measuring abdominal pressure and the anorectal angle simultaneously.

4

٥ To compare the straining forces applied when sitting or squatting during defecation.

Material and Methods

٥ Six healthy volunteers(one male, five females)٥ Age range:36–44 years(mean age:41 years

old)٥ Apparently normal bowel function٥ A triple-lumen 9F catheter was inserted into

the anus٥ An 8F catheter (used to measure abdominal

[bladder] pressure) was inserted into the bladder

5

6

Results

7

Conclusions

٥ The results of the present study, taken together with earlier findings, suggest that the greater the hip flexion achieved by squatting the straighter the rectoanal canal will be, and accordingly, less strain will be required for defecation.

8

References٥ Ryuji Sakakibara,Kuniko Tsunoyama, Hiroyasu Hosoi, Osamu Takahashi,Megumi

Sugiyama,Masahiko Kishi, Emina Ogawa, Hitoshi Terada,Tomoyuki Uchiyama, Tomonori Yamanishi,“Influence of Body Position on Defecation in Humans,” LUTS, 2, 16–21, 2010

٥ Dov Sikirov, “Comparison of Straining During Defecation in Three Positions,” Digestive Diseases and Sciences, 48(7),1201-1205, 2003

٥ http://www.youtube.com/watch?v=cdijh32NiLs

٥ http://cht.a-hospital.com/

٥ http://ibs.about.com/od/ibsglossaryae/g/Anorectal-Manometry.htm

٥ http://www.colonicvitalityuk.com/news.asp?id=25

٥ http://cosmicamericanblog.blogspot.tw/2010_08_01_archive.html

٥ http://lady.people.com.cn/BIG5/n/2012/0822/c1014-18799941.html