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Low back stretching. Helpful or harmful?

Dr. Stuart McGill says having a mobile back not necessarily a good thing

Stretching. We are told to do it on a daily basis. We have been taught that it’s good for the body and, in particular, a flexible spine will help eliminate low back pain.

What if stretching your low back is actually doing more harm than good, especially if you already have low back pain?

I recently got the opportunity to interview Dr. Stuart McGill, aka Dr. Spine, about stretching and what his research is saying about the topic.

If you have not heard of McGill, he is somewhat of a rock star in the health and fitness world (he’s our Mick Jagger, but a few decades younger and with a lot more facial hair).

McGill is a kinesiology professor at the University of Waterloo as well as the director of the Spine Biomechanics Laboratory.

Spine Biomechanics is a lab dedicated to understanding how the low back functions and how it becomes injured. Then using that information the researchers formulate strategies and plans to prevent and rehabilitate low back pain.

He is also the author of two books on the spine (one more on its way next year), DVDs and has written countless papers on the subject.

He’s been featured in the New York Times, Maclean’s magazine, and has been quoted and interviewed for hundreds of newspapers, magazines, blogs and podcasts around the world.

When asked about stretching and the low back, he explains that a mobile back is not necessarily a good thing. In fact, statistically those with a greater range of motion in the back actually have a greater risk of low back pain.

You see, to bear load the spine needs stability and not always mobility. The muscles of the spine, he says, generally function to stop movement, while the muscles around the hips, legs, arms and shoulders create motion.

If the spine isn’t stable, the limb muscles loose efficiency to create arm and leg movement at the hips and shoulders.

From a spine disc perspective, a flexible disc is more easily damaged when high loads are applied to it. In contrast, discs must be toughened and stiffened to bear high load. A powerlifter must develop a stiffer spine.

It is difficult to train for both purposes so either have a flexible spine, but don’t train with heavy loads, or train with heavy loads but do not stretch the spine. Focus mobility at other joints.

When pressed for what stretches we should be doing, he declined to give me a definitive answer. McGill is a one-on-one assessment guy and explains that it depends on the individual, their fitness goals, their body type and their architecture and pain history.

For instance, if you are thick spined and big boned, you were never designed to bend effortlessly in the first place so a good training goal for you would be a strong spine.

But if you are long and slender, your body type predisposes you to touching your toes and a realistic goal for you could be channelling your inner yogi.

He used the analogy of a willow branch to explain it to me. A long thin branch, like a person, will bend no problem. However, a thicker, stronger branch will either break in half completely, or at least splinter, when bent, but it can support much more load.

Because I couldn’t help myself, I started to ask him about my back pain. I have been plagued with low back pain off and on for years and have taken up yoga, thinking I was helping my back. (He must get so tired of that! Everyone airing his or her low back dirty laundry.)

He quickly schooled me. Apparently as we age our spines naturally stiffen. However, with all this stretching that I am doing I am slowing down the process of this stiffening, and in my case stiffening the spine joints is good. It will produce that stability that my low back needs.

He went on to scold me that I need to pick a training goal too.

Do I want to be flexible or do I want to lift heavy? What do I want out of my fitness program? Because all this “willy-nilly” in the gym is just digging my own grave and creating my own path to pain. In essence, I am my low back’s biggest enemy.

Yeah, McGill does not pull any punches.

What do I suggest you do at home? First off, if you are plagued with low back pain, make sure you see a good physiotherapist. They are best equipped to assess, diagnose and treat pain.

Second, assess your body type and figure out what your fitness goals are. From there you can start a fitness program geared to those goals (no more willy-nilly in the gym).

Third, continue to stretch the muscles around the hips and shoulders, while performing plank movements to increase the stability of the muscles around the spine.

PJ Wren is a local personal trainer and writer in the Delta area. Be sure to check out her fitness show on Delta TV and you can also reach her at www.gofitgals.com.