When we talk about the core muscles, however, we are referring to the muscles of the trunk (Rectus Abdominis, Obliques and Transverse Abdominis - left - as well as the lumbar extensors) which surround the mid-section, front and back like a corset, stabilising the trunk as the limbs move, providing support for the back and helping us bend and rotate.
It’s not possible to tell whether the weakness causes the pain, or is as a result of the pain, but if you have any of the following symptoms, you may one of many who have weakened muscles of the low back and core:
Pain, aching or stiffness when on your feet for long periods
It is the primary job of your core and back muscles to keep you upright. When the muscles aren’t strong enough to support your body, they fatigue and ache as demand on them increases.
Pain when running or exercising
Same as above, your back and core will be working extra hard to maintain your posture and technique as you run/exercise or will force other muscles to work harder to compensate.
One study on a group of runners found that when the deep muscles of the core were in a weakened state, the body was forced to overcompensate using superficial abdominal muscles, meaning the runner was able to run in the same way, but with an increased load on the spine. https://www.painweek.org/media/news/avoiding-runners-chronic-back-pain-its-all-core
Aching and/or stiffness towards the end of the day
This could be a sign of muscle weakness. Again, your core and back have been working hard to maintain your position all day and may tire as the day progresses.
(note: any back pain which you notice at night when you lie down, and doesn’t go away when you adjust positions should be checked by a doctor as it could be a sign of something more serious)
Your core muscles are designed to carry your body in the best position for your comfort and health and to maintain correct alignment of your body, that is how your head, shoulders, spine, hips, knees and ankles line up with each other.
You should have a natural ‘s’ shape in your spine, so if you are not in alignment (for example, if your shoulders are rounded and your spine curves forwards excessively), your muscles become imbalanced. Some become shorter and tighter and others long and weak resulting in a reduction of use and weakening as a result.
Sitting down all day
When we stand and move, our deep core muscles are activated and working to keep us upright and to facilitate movement. As soon as we sit, the muscles switch off. This prolonged decrease in use can cause them to weaken over time.
During pregnancy, the muscles at the front of the abdomen stretch and separate to accommodate the growing baby. This, combined with the tipping forward of the pelvis affects the ability to stabilise the core and weakens the muscles as they elongate.
The pelvic floor muscles also make up part of the ‘core’. They are essentially a hammock at the bottom of the pelvis, supporting the pelvic organs. As the baby passes through the pelvic floor muscles during birth, core stability is further compromised, and the pelvic floor can become weak.
During a caesarean delivery, the abdominal muscles are separated to allow the baby to be delivered. After they are stitched back together, scar tissue forms, which can affect the muscle’s ability to work properly as they contract.
If the abdominal muscles have been cut during any abdominal surgery, just as with a C-section (above), the formation of scar tissue where the incision was made will affect the muscles’ ability to contract and may result in decreased strength.
There may be an imbalance of the core muscles if they are forced to maintain an unnatural position for prolonged periods. This can be common in occupations such as mechanics, bricklayers and carpet fitters to give a few examples.
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