Core Stability and Strength
Here is a posting from my good friend Joe Heiler, PT. A brilliant clinician. Enjoy.
Core stability and core strength are terms that are often used interchangeably when speaking about training the trunk musculature and spinal stabilization. The fact is that they are quite different. Training for core stability requires resisting motion at the lumbar spine through activation of the abdominal musculature as a whole. Training for core strength allows for motions to occur through the lumbar spine in an attempt to work the abdominal or back musculature, often in an isolated fashion. Looking at the functional anatomy of the lumbar spine, it does allow for movement in all three planes of motion but overall it is quite limited.
- The lumbar spine can move quite a bit through flexion and extension but we know from experience to avoid repetition going the extremes, hanging out at one extreme or the other for prolonged periods, and to avoid high loads while trying to move through the lumbar spine.
- Rotation at the lumbar spine is only supposed to contribute 13% of total spine rotation (Sahrmann, 2002), hence limiting rotation with training might be a good idea.
- Lateral flexion occurs as well but limited. The total amount of lateral flexion allowed from L1-S1 is 27 degrees, while the thoracic spine is capable of contributing up to 75 degrees (Sahrmann, 2002). This also has a degree of rotation to it which again is not really designed to happen in the lumbar spine.
Think of the sports that require tremendous amounts of rotation. Golf and baseball (pitchers) come to mind. Two populations we see quite often with back pain. They get more than enough rotation and lateral flexion with every swing or throw so why add more? Throw out the stability ball crunches, superman exercise, crunches with a twist, side bending, etc. Teach them to resist these motions against a load, and how to maintain a stable spine through a golf swing or a pitch. Work on bird dogs, front and side planks, chops and lifts in tall kneeling and half kneeling, and don’t forget to deadlift.
Joe Heiler, PT
Perry Nickelston, DC
