Recently I received an email asking me if there was a difinitive test
for core stability. The very real truth is that I think there is no
single test, but a combination of tests should reveal a lot about what
we want to know.
Personally, I’ve been heavily influenced by Stuart McGill and Shirley
Sahrmann. I’ve also taken some great ideas from bright guys like Mike
Robertson, Bill Hartman, and Gray Cook to formulate some of my core
testing tools.
To start let’s just address the fundamentals. Strength is the
ability to produce force and stability is the ability to control it.
So doing crunches on a stability ball with a hundred pound dumbbell on
your chest might make you strong (although I think it makes you look
ridiculous), it isn’t going to improve your core stability. To be
stable you must be able to RESIST the applied force without movement.
Going hand in hand with this notion is the idea that is currently
being promoted by many educated coaches and trainers that repeated
spinal flexion is a bad idea because it increases the risk of spinal
disc injury. In other words, crunches suck!
Finally, lets remember that the core doesn’t just include the rectus
abdominus or the anterior core muscles. It essentially forms a belt
around us and includes more muscles than I’d like to count at this very
moment. Knowing this, it is essential to investigate the muscles all
around the core to determine stability. More importantly, we are not
going to test the strength of these muscles, but the ability of them to
support the core under load. In the case of the lower back, endurance
is actually far more important than strength for injury prevention.
Here is a quick little protocol that I like to use as a starting point:
1. Front Plank
While doing this movement I like to place a dowel on the person’s
back and have them maintain 3 points of contact. The dowel should
remain in contact with the glutes, upper back, and head. If one of
those points is lost then the timer stops. (Note: I swiped this tip
from Mike Robertson)
You should be able to hold this position for 2 minutes.
2. Side Plank – Should be able to hold for 90 seconds
This is as easy as it sounds. The body should be held straight in a
full side plank position for 90 seconds per side. Note any assymetry
between the sides as this is a strong predictor on injury risk. Work on
bringing the weaker side up to match the stronger side before trying to
increase the overall time.
You should be able to hold this position for 90 seconds.
3. Back Extension Hold
Set up at though you’re going to do a back extension and hold
yourself in the extended position. As with the front plank, use the
dowel along the spine to ensure proper alignment by maintaing 3 points
of contact.
You should be able to hold this position for 2 minutes.
4. Double Leg Lower
To perform this test you want to lie on your back and raise both legs
straight up into the air. From here, I’d suggest placing your hands on
your external obliques or crossed over your chest. They cannot be on
the floor. Now slowly begin to lower your legs while concentrating on
keeping your lower back flat on the floor. (Note: a hard floor is more
effective than a mat for determining success on this test)
If your feet hit the floor before your lower back raises you have
passed. If not, you suck and you should check yourself into the wimp
hall of fame. Just kidding, but your ability to control your core is
probably lacking in this respect.
5. Rotational Stability
I also like to assess rotational stability by using a test from the
functional movement screen. If you’re going to fail only one of these
tests, this will probably be it. You can check it out
HERE.
Again, these only serve at starting points and there are obviously
other factors affecting stability of the core, but these tests should be
enough to get you rolling.
In the coming weeks I’ll be releasing an audio interview series that
will detail how some of the world’s leading experts test and train the
core for performance and just plain looking sexy. Keep your eyes peeled
for that.
In the meantime, drop me a note in the comments to let me know how you make out on the tests above.