FIRST... we need to recognize that there are different ways a person can engage their core. There are many incorrect ways and only 1 correct way. This affects whether IAP stays more in the abdominal cavity or pelvic cavity.
SECOND..when a person engages their core correctly, IAP does increase slightly. When a person lifts a heavy weight and engages the core more, IAP increases even more.
Does that mean engaging the core is bad for you? Well we know that isn't true. The core needs to engage to provide a foundation for lifting and moving.
The questions we should be asking is:
1. What is causing the IAP?
2. Where is the IAP going when a person engages their core (abdominal, thoracic or pelvic cavity?)
3. Are the core muscles strong?
4. Is the pelvic floor lifting like it should when core engages?
5. How is the person engaging their core?
6. Are they using proper breathing mechanics?
This is what determines whether IAP is helpful or damaging!
IAP does NOT automatically put pressure on the pelvic floor
When the CORE stabilization system (diaphragm, transverse abdominals, pelvic floor and multifidus) is reactive, the pelvic floor will lift when the TVA engages. This protects the pelvic floor and helps contain pressure in the abdominal cavity and off the pelvic floor. It is this pressure when increased that helps stabilize the spine (lock it into place) when exerting force.
PRACTICE CORRECT WAY TO ENGAGE: Lift pelvic floor, breathe out as you engage abs. Where does the pressure go? Up in the Abdominal Cavity off the pelvic floor. (If you are having trouble figuring out how to do this, you need to reconditioning your core)
|Copyright 2015 MomBod Fitness, All Rights Reserved|
IAP is what helps stabilize the spine
so a person can lift heavier weights safely
If the pelvic floor is not responding (lifting) when the TVA engages (see pic below), then IAP may get pushed downward and put more pressure on the pelvic floor (like when a person has a bowel movement)..this of course is not a good thing. This is what contributes to peeing when lifting heavy weights.
PRACTICE WRONG WAY #1: Breathe out while engage abs in and "bear down" (like having a bowel movement) - where does the pressure go? Yes, down to the pelvic floor.
PRACTICE WRONG WAY #2: Hold breath, "bear down" without engaging the abs (belly bulges out instead). Where does the pressure go? Yes, down to the pelvic floor and out to the belly button.
|Copyright 2015 MomBod Fitness LLC, All Rights Reserved|
Yes ladies, peeing when doing CrossFIT or lifting heavy weights is not a good thing. This can mean that the pelvic floor is not engaging like it should and pressure on the bladder is too much.
Picture a flat bike tire. Without the proper amount of air pressure, the tube walls are flimsy and weak.
Picture a filled bike tire, when air is contained and increased, the tube walls are strong and stable.
Increased IAP helps stabilize the spine
So is IAP good or bad?
It depends on your breathing
It depends on your muscles ability (strength) to contain the pressure
It depends on where the pressure is going
It depends on what is causing the IAP
Learning to direct intra-abdominal pressure correctly will help:
- reduce stress on pelvic floor
- use core muscles efficiently
- breathe efficiently
- stabilize the spine
To say that all abdominal binders are bad for you..is also a big assumption. Its like saying all ankle braces are bad for you. Again, it depends on what it's being used for; how it works, how much pressure is applied, how it is used and what the claims are. A person can wear an ankle brace too tight and restrict blood circulation and restrict too much motion. There is a science to taping an ankle correctly. The same goes for abdominal supports, they can work differently! Some are flexible, some are stiff, some are fully adjustable, some are not, some are tall, some are short. It's very possible to wear an abdominal support and have the same amount of IAP applied as when someone engages their core. Its possible to have less, its possible to have more. Again many variables, many differences.
We all want the simple answers, yet there are many variables that create a healthy or unhealthy pressure environment.
Celeste Goodson, owner of MomBod Fitness, has worked in health and fitness settings for over 15 years as well as physical therapy and cardiac rehab. She has worked exclusively with pre and post natal moms for the last 5 years with ReCORE. She developed ReCORE and the FITsplint after realizing women can benefit from proper screening, testing, rebuilding and guidelines before returning to typical exercise. Celeste has a B.S. if Fitness and Wellness, is an ACE Cert. Medical Exercise Specialist; certified to train Pre and Post Natal women as well as those with musculokeletal, neuromuscular and metabolic conditions.
Bartelink, D.L. (1957). The role of abdominal pressure on the lumbar intervertebral discs. Journal of Bone and Joint Surgery [Br], 39, 718-736.
Sullivan, M.S. (1994). Lifting and back pain. In Twomey, L.T., & Taylor, J.R. Physical Therapy of the Low Back. (2nd ed.). New York: Churchill Livingstone, 329-356.
Thompson J, O'Sullivan PB, Briffa NK, Neumann P (2006). Differences in muscle activation patterns during pelvic floor muscle contraction and Valsalva maneuver. Neurourol Urodyn., 25(2):148-55.
Cobb W, Burns J, Kercher K, Matthews B, James Norton H, Todd Heniford B. Normal intraabdominal pressure in healthy adults. J Surg Res. 2005;129:231–235. doi: 10.1016/j.jss.2005.06.015.
O'Dell K, Morse A, Crawford S, Howard A 2007 Vaginal pressure during lifting, floor exercises, jogging, and use of hydraulic exercise machines.Int Urogynecol J Pelvic Floor Dysfunct. Dec;18(12):1481-9. Epub 2007 May 22.