Gotta Go: Anatomy and Physiology of the Poop Chute

In Pelvic Floor Physical Therapy by Kim Buonomo2 Comments

By: Kim Buonomo, PT, DPT, PHRC Lexington

Everyone’s had that moment…You don’t have to go to the bathroom AT ALL and then suddenly you’re running to the toilet like there’s no tomorrow. How do things change so quickly? I’m going to teach you about the Rectoanal Inhibitory Reflex (RAIR) and what that means for fecal urgency and incontinence.

In order to have a bowel movement, the pressure of the stool in your rectum should be greater than the pressure in your pelvic floor. This is why your pelvic floor has the ability to contract and relax, so that you can contract and maintain continence when you want to, and relax to allow passage of stool when you want to. At the Pelvic Health and Rehabilitation Center, we often see patients who have trouble relaxing their pelvic floor muscles. This results in things like straining, incomplete emptying, and holding your breath when you have a bowel movement, which all reinforce those bad habits. Pushing against a contracted muscle is like pushing against a closed door. Nothing will get through!

Let’s focus on the pelvic floor for a moment. The whole pelvic floor works together with your abdomen and diaphragm, so a thorough examination of all of these areas by an experienced pelvic floor PT is crucial. There are three pelvic floor muscles that I think about a lot in a patient with fecal urgency. The internal anal sphincter is primarily made of smooth muscle. This is the same kind of muscle that makes up your heart and internal organs and acts without you having to think about it. When the internal anal sphincter senses pressure from stool in the rectum, it stimulates an involuntary reflex that relaxes the sphincter to allow a small amount of stool to move into the lower part of the rectum where it encounters puborectalis.

The way that puborectalis is positioned allows it to act like a sling. When you stand, the sling “chokes” the rectum and maintains continence. When you squat, it eases up on that sling and allows for a bowel movement. If that sling never relaxes to allow a BM, then you won’t be able to poop! This is why we always talk about squatting as the preferred pooping position and why the squatty potty became so popular. Nicole talked about squatting and fecal incontinence in this blog post. There are special mucosal receptors in the lower rectum that give you information about the consistency of whatever you are passing. Your body then can choose the appropriate course of action. So if it’s air or gas, go ahead and cut the cheese! If it’s solid, you contract puborectalis to maintain continence and find your way to a bathroom so you can go in peace. If it’s liquid, you strongly engage puborectalis and the external anal sphincter, squeeze those cheeks and run to the bathroom!

 

Makes sense, right? So what can make this system go haywire and how can pelvic floor physical therapy help?

First, let me say that there are countless possibilities, and I will only be able to discuss a few of them here. An examination by a skilled pelvic floor physical therapist is important in determining and addressing the cause of your specific dysfunction.

In order to maintain fecal continence, you need three things.

  1. The ability of the rectum to fill with stool.
  2. Awareness of rectal filling (urge).
  3. Ability to propel the stool and relax the pelvic floor muscles in a coordinated fashion.

Pelvic floor PTs can help with all of these in various ways!

  1. The ability of the rectum to fill with stool.

If the motility of the colon is slow,  the stool can take too long to get to the rectum, so it doesn’t fill and stimulate an urge until the stool is too hard to pass without straining. A pelvic floor PT can teach colon massage and educate about other factors in life that affect colon transit time (stress, sleep schedule, diet) to help speed things up naturally. There are a lot of over the counter (OTC) medications that can affect stool consistency and transit time. Physical therapists take pharmacology as part of their training, and while you should defer to a pharmacist for the final word, a PT can help point you in the right direction of OTCs and make sure you aren’t taking medications that counteract each other.

  1. Awareness of rectal filling (urge).

Depending on your specific circumstances, up training (strengthening) the internal anal sphincter or using a bowel schedule AKA bowel retraining can improve your body’s awareness of filling and stimulate an urge. There are also tools that a PT can use to mimic the feeling of the rectum filling with stool, so you can get used to that feeling and associate it with an urge, making you start moving to the bathroom at the appropriate time.

  1. Ability to propel the stool and relax the pelvic floor muscles in an organized fashion.

This is where we shine. Pelvic floor PTs are great at assessing muscle function and motor control/coordination. We can examine tight abdominal muscles, breathing patterns, pelvic floor tone, motor control (the ability to make the muscles do what you want them to do) and can provide feedback and homework to help this system work more effectively as a unit and get you pooping like a champ! Biofeedback training has been proven to be effective for management of dyssynergic defecation (lack of coordination when you have a bowel movement).

If you have fecal urgency, constipation, or incontinence, I recommend you contact one of our offices to see how we can help you!

 

References:

American Society of Colon and Rectal Surgeons. (2018). Pelvic Floor Dysfunction Expanded Version.  [online] 

Rao SSC, Go JT. Treating Pelvic Floor Disorders of Defecation: Management or Cure? Current gastroenterology reports. 2009;11(4):278-287. 

GI Society. Canadian Society of Intestinal Research. (2018). Pelvic Floor Dysfunction. [online]. 

Center for Colon & Rectal Care. (2018) Pelvic Floor and Functional Colon Disorders. [online] 

Herman and Wallace inc. Pelvic Rehabilitation Institute. Bowel Function, Dysfunction and Pathology. 

FAQ

What are pelvic floor muscles?

The pelvic floor muscles are a group of muscles that run from the coccyx to the pubic bone. They are part of the core, helping to support our entire body as well as providing support for the bowel, bladder and uterus. These muscles help us maintain bowel and bladder control and are involved in sexual pleasure and orgasm. The technical name of the pelvic floor muscles is the Levator Ani muscle group. The pudendal nerve, the levator ani nerve, and branches from the S2 – S4 nerve roots innervate the pelvic floor muscles. They are under voluntary and autonomic control, which is a unique feature only they possess compared to other muscle groups.

What is pelvic floor physical therapy?

Pelvic floor physical therapy is a specialized area of physical therapy. Currently, physical therapists need advanced post-graduate education to be able to help people with pelvic floor dysfunction because pelvic floor disorders are not yet being taught in standard physical therapy curricula. The Pelvic Health and Rehabilitation Center provides extensive training for our staff because we recognize the limitations of physical therapy education in this unique area.

What happens at pelvic floor therapy?

During an evaluation for pelvic floor dysfunction the physical therapist will take a detailed history. Following the history the physical therapist will leave the room to allow the patient to change and drape themselves. The physical therapist will return to the room and using gloved hands will perform an external and internal manual assessment of the pelvic floor and girdle muscles. The physical therapist will once again leave the room and allow the patient to dress. Following the manual examination there may also be an examination of strength, motor control, and overall biomechanics and neuromuscular control. The physical therapist will then communicate the findings to the patient and together with their patient they establish an assessment, short term and long term goals and a treatment plan. Typically people with pelvic floor dysfunction are seen one time per week for one hour for varying amounts of time based on the severity and chronicity of the disease. A home exercise program will be established and the physical therapist will help coordinate other providers on the treatment team. Typically patients are seen for 3 months to a year.

What is pudendal neuralgia and how is it treated?

Pudendal Neuralgia is a clinical diagnosis that means pain in the sensory distribution of the pudendal nerve. The pudendal nerve is a mixed nerve that exits the S2 – S4 sacral nerve roots, we have a right and left pudendal nerve and each side has three main trunks: the dorsal branch, the perineal branch, and the inferior rectal branch. The branches supply sensation to the clitoris/penis, labia/scrotum, perineum, anus, the distal ⅓ of the urethra and rectum, and the vulva and vestibule. The nerve branches also control the pelvic floor muscles. The pudendal nerve follows a tortuous path through the pelvic floor and girdle, leaving it vulnerable to compression and tension injuries at various points along its path.

Pudendal Neuralgia occurs when the nerve is unable to slide, glide and move normally and as a result, people experience pain in some or all of the above-mentioned areas. Pelvic floor physical therapy plays a crucial role in identifying the mechanical impairments that are affecting the nerve. The physical therapy treatment plan is designed to restore normal neural function. Patients with pudendal neuralgia require pelvic floor physical therapy and may also benefit from medical management that includes pharmaceuticals and procedures such as pudendal nerve blocks or botox injections.

What is interstitial cystitis and how is it treated?

Interstitial Cystitis is a clinical diagnosis characterized by irritative bladder symptoms such as urinary urgency, frequency, and hesitancy in the absence of infection. Research has shown the majority of patients who meet the clinical definition have pelvic floor dysfunction and myalgia. Therefore, the American Urologic Association recommends pelvic floor physical therapy as first-line treatment for Interstitial Cystitis. Patients will benefit from pelvic floor physical therapy and may also benefit from pharmacologic management or medical procedures such as bladder instillations.

Who is the Pelvic Health and Rehabilitation Team?

The Pelvic Health and Rehabilitation Center was founded by Elizabeth Akincilar and Stephanie Prendergast in 2006, they have been treating people with pelvic floor disorders since 2001. They were trained and mentored by a medical doctor and quickly became experts in treating pelvic floor disorders. They began creating courses and sharing their knowledge around the world. They expanded to 11 locations in the United States and developed a residency style training program for their employees with ongoing weekly mentoring. The physical therapists who work at PHRC have undergone more training than the majority of pelvic floor physical therapists and as a result offer efficient and high quality care.

How many years of experience do we have?

Stephanie and Liz have 24 years of experience and help each and every team member become an expert in the field through their training and mentoring program.

Why PHRC versus anyone else?

PHRC is unique because of the specific focus on pelvic floor disorders and the leadership at our company. We are constantly lecturing, teaching, and staying ahead of the curve with our connections to medical experts and emerging experts. As a result, we are able to efficiently and effectively help our patients restore their pelvic health.

Do we treat men for pelvic floor therapy?

The Pelvic Health and Rehabilitation Center is unique in that the Cofounders have always treated people of all genders and therefore have trained the team members and staff the same way. Many pelvic floor physical therapists focus solely on people with vulvas, this is not the case here.

Do I need pelvic floor therapy forever?

The majority of people with pelvic floor dysfunction will undergo pelvic floor physical therapy for a set amount of time based on their goals. Every 6 -8 weeks goals will be re-established based on the physical improvements and remaining physical impairments. Most patients will achieve their goals in 3 – 6 months. If there are complicating medical or untreated comorbidities some patients will be in therapy longer.

Comments

  1. Thank you so much for your article. I have been a PT x 30 yrs. and have taken H&W 1a, 2a and am trying to put it all together. Your article was a wonderful synopsis of this. I appreciate your contribution for our patients out there and fellow colleagues.

  2. Thank you for this article. It’s on a subject no one wants to talk about, yet affects many. Thank you!

Leave a Comment