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Physiology of the squatting posture
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Physiology of the squatting posture

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The Physiology of the squatting posture and the muscles involved


Creating an open passage for stool to pass effortlessly,Anorectal angle,Puborectalis muscle,Anorectal junction,Rectum, anus, colon, sphincters, muscles, sitting and squatting posture



"Man was not meant to sit on a toilet, but to squat in a field."

Michael I. Freilich, MD
Retired Surgeon
Marina Del Rey, CA

We are all aware that elimination of waste, evacuation of the bowel or opening the bowel can be controlled by contracting or relaxing the external anal sphincter by voluntary thought processes.
This is the process involved during “toilet training”.

When we get the urge to go, we do not always follow this urge and open our bowels. Our social attitudes interfere with this process and we often ignore the urge until a more “convenient” time. This is voluntary control of the defecation process.

However, the external anal sphincter alone is not sufficient to maintain faecal continence. In addition to the internal anal sphincter which is under the control of the central nervous system, the human body is equipped with a bend at the junction of the rectum and the anus which is maintained by a sling like muscle called the puborectalis muscle. When we are in the standing posture and to some extent the sitting posture, this bend, which is known as the Anorectal angle, is at an angle of about 90 degrees. This bend creates a “kink” and exerts upward pressures in the direction of the rectum to help contain the faecal mass.
In the squatting posture this bend tends to straighten out to remove the “kink” and creates a clear path between the rectum and anus. This clear path allows easier and unobstructed passage of faeces from the rectum into the anal canal.

The raised toilet seat where one is seated in a similar fashion to the seated posture on an office chair or dining chair where continence is maintained by the puborectalis muscle ,does not produce an Anorectal angle that allows the creation of an open and clear path between the rectum and anus.
This natural obstruction to the passage of faeces from the rectum to the anus prevents easy passage of stool through the Anorectal canal when one is in the seated posture on a raised toilet seat and requires the creation of pressures by straining in order to overcome the obstruction to force the faeces out of the rectum and into the anal canal towards the exit.

The squatting posture allows the sling like puborectalis muscle to relax and release its grip on the Anorectal junction.
This creates an Anorectal angle which is more or less straight and allows the aligning of the rectal and anal canal to form a clear path for the passage of stool.
Complete and easy evacuation of the sigmoid colon and rectum is possible without the need for straining in this posture.

Human physiology was adapted to a hunter-gatherer type of lifestyle over hundreds of thousands of years. This involved consumption of unprocessed food and defecating in the squat posture. The human body has not evolved much since we started to walk; at least as far as our elimination organs are concerned.
The human body is susceptible to sudden changes in behaviour for which it is not adapted.
The introduction of the raised toilet in early 19th century and the abandonment of the squat posture for elimination appear to be one example of a forced change in an important social habit and have contributed to the introduction of many “new” medical conditions.
The introduction of “processed” foods at around the same time in our past has been a contributory factor.
The human body (at least in some populations who have adopted a western lifestyle) appears to have received an all mighty shock from which it needs rescuing. We need to go back to the old ways.

How to heal and prevent Bowel disorders

Diet is not about what you should NOT eat, it’s about what you should include in the diet that matters.
As long as your diet includes the correct balance of plant foods containing soluble fibre, insoluble fibre and resistant starch your colon will produce the perfectly formed stool. The important next step is to evacuate this stool without straining so that the body does not suffer from the pressures created each time the bowel is emptied.

In order to heal and prevent bowel disorders you need to make lifestyle changes that last the rest of your life time.

1. Include more fluids and plant food containing soluble fibre, insoluble fibre and resistant starch in the diet so that the perfectly formed stool will be made in the colon and beneficial bacteria will flourish and eliminate disease causing bacteria and fungi.

2. Evacuate the perfectly formed stool by adopting the squat posture to eliminate the need to strain during bowel movements.

It is not possible or safe to squat on the modern raised toilet seat installed in all western homes and it is impossible to squat for any length of time if you have not done this from childhood onwards. This makes the use of any raised platforms impossible to adapt to.

The SquattLooStool is designed to allow you to adopt the squat posture while seated comfortably on your raised toilet seat.
The single best and easiest lifestyle change you will ever make, leading to a healthier body.


Human defecation postures