Can I do a crunch?

Written by Bryn Zolty, PT

If I just had a baby can I return to running? I’m leaking - can I do exercise that involves jumping? My doctor says I have a prolapse - can I lift weights at the gym? As pelvic physical therapists, we hear these questions every day. It is very common to wonder if after having a baby, a surgery, or if you have pain in the pelvis, if it is okay to engage in activities that can push pressure down into the pelvis.
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While more research is needed to better answer these questions, there are a couple of studies available that have measured the pressure in the vagina with functional tasks, yoga poses, and other exercises in attempts to answer these questions. ​Here is a little of what they found with a group of women ranging in age from 20-51:​

• Crunch AVG pressure: 23.8, range 19-76, with an exhale AVG 12.4 range 8-75
• Downward facing dog AVG pressure: 39.1 range 26-72
• Exercise machines AVG 37 range 20.3-182.3
• Jumping AVG 171 range 43-252
• Coughing AVG 98 range 49-130
• ​Bearing down with breath hold AVG 101.7 range 45-131

​​*​Units of pressure used in the study are in cm of water. This is the height in cm of water displaced by pressure. (O’Dell et al.2007) (Cobb et al. 2005)

These numbers can surprise people.  How can a crunch be so bad if the average pressure is 23.8 and a normal daily occurrence like coughing is 98? As a therapist, my focus is drawn to the large ranges within each activity. What is the woman doing differently to crunch at a pressure of 8 compared to the woman at a 75?

As therapists we evaluate how you move and conduct each of these activities. As pelvic physical therapists we look closer at your movement, alignment, breathing, coordination, and muscle tone in relation to the pelvis. All these factors play a role in the pressure your body places on the pelvic floor. This pressure is known as the intra-abdominal pressure. This is how one woman can have very low pressure on her pelvic floor while another woman has high pressure during the same activity. The key is how they complete the task.

Back to the question, can I do a crunch? Can I return to strenuous exercise? Our goal is to teach you how to do movements or activities properly while minimizing the negative impact on the pelvic muscles. A pelvic physical therapist’s job is to evaluate the movement or activity that gives you pain or makes you leak and improve it.

How do we do this? Let’s take a squat for example. If a patient comes in because she leaks urine while squatting, we would explore all the possibilities.  

• If a weak pelvic floor is causing your leaking, we would teach you techniques to strengthen/engage your pelvic floor and prevent leaking. This could be done by performing a pelvic contraction, a breathing pattern to encourage activation, or even using a high tone phonation!
• Conversely, leaking can also be caused by a tight/tense pelvic floor. In this situation, we could trial lengthening/releasing the pelvic floor during the squat.
• ​Alternatively, leaking could be caused by too much pressure on the pelvic floor and not necessarily lack of strength. It is possible that a change in alignment of the head/neck, ribs, or pelvis could increase pressure higher than the pelvic floor can support.  According to the study holding your breath and bearing down causes an average pressure of 101.7. It may be your breathing pattern might need to be adjusted!

​After having babies, surgeries, or injuries our bodies change. Some of these changes can lead to incontinence or pain. A pelvic physical therapist is a great clinician to discuss these changes along with your goals for fitness or everyday activities.  Whether it’s cueing on alignment or movement strategies, breathing, releasing or strengthening, it is our goal to help you reach yours.
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References/Citations

From the Glottis to the Pelvic Floor: Making Clinical Connections.  Julie Wiebe, PT, MPT,BSc, and Susan Clinton, PT,DScPT,OCS,WCS,FAAOMPT.

Cobb WS, Burns JM,Kercher KW, Matthews BD, Norton HJ,Heniford BT.  Normal Intra-abdominal Pressure in Healthy Adults. 2005; Journal of Surgical Research 2005; (129):231-235.

O’Dell KK, Morse AN,Crawford SL, Howard A.  Vaginal Pressure during lifting, floor exercises, jogging, and use of hydraulic exercise machines.  International Urogyneocology Journal, 2007;18: 1481-1489.