Dangers of Lumbar Flexion in Yoga
Consider the number of times you flex forward at the waist or hips in a yoga class. Lower back flexion in yoga presents a number of risks when done improperly. We often hear our yoga teacher telling us to hinge at the hips instead of the lower back. Let’s consider what these cues really mean and offer in creating a safe forward bending yoga posture. First of all we have to go through a bit of yoga anatomy and biomechanics to understand the issues involved in this common movement.
Our spine is composed of twenty-four mobile vertebrae. The cervical spine includes the top seven vertebrae, while the thoracic spine is made up of the middle twelve, and the lumbar spine completes the count with the bottom five. Below the last lumbar vertebrae are the sacrum and coccyx. The sacrum is a triangular shaped bone that is actually the fused remnant of five sacral segments. The coccyx, also known as our “tailbone,” is an even smaller triangular bone that sits below the sacrum.
Both our cervical and lumbar spines take on a curve that is known as a lordosis. This lordosis essentially means that the cervical and lumbar curves’ concave sides face the front of the body; while our thoracic curve’s concave side faces the back of our body.
In-between each vertebra is an intervertebral disc. The basic functions of the discs are to act as vertebral shock absorbers and as spacers for the spinal nerves to exit the bony vertebral column. Our spinal cord runs down the inside of our vertebrae; each spinal nerve that divides from the spinal cord supplies a particular part of the body with neurological function. This explains many of the symptoms people get when they herniate or bulge a disc (burning, aching, pins and needles, tingling, pain, and weakness through particular parts of the limbs).
Intervertebral discs are round in shape with thick outer borders and jelly-like contents within the border. Each time we bend forward at the low back, the back side (posterior side) of the disc weakens. Over time, with excessive lumbar spinal loading or flexion, the disc develops microtears. Sometimes, these microtears can produce symptoms that are relatively mild; however, when the tears become more significant, symptoms become quite severe. If the thick border has enough microtears or one large tear, the inner jelly-like substance can squish out of the tear to either chemically irritate or physically compress the spinal nerves that exit the spine off of the spinal cord.
How is this complicated anatomy relevant to yoga, picking up a piece of paper off the ground, or even bending over to brush your teeth? Lumbar flexion is the movement of bending forward at the low back while rounding the spine. Due to the lordosis (lumbar curve), this position of flexion increases the likelihood of intervertebral disc microtears which then increases the chances of disc irritation, bulging, and most severely, herniation. A disc injury is one you most definitely want to avoid as they are hard to recover from and they increase your chances of low back injury recurrence; never mind the fact that they cause a lot of pain and can cause symptoms severe enough to require surgery due to neurological complications.
You must now be wondering how to keep your back safe while bending forward either on your mat or in your activities of daily living. When you bend forward, think about keeping your buttocks out and maintaining the natural curve in your lumbar spine. When you are standing straight up and when you bend forward, your lumbar curve should not change shape (much). Hinge forward at your hip joints instead of at your lumbar spine. People always say, “I bend my knees when I flex forward so I am ok!” My answer to that is that you can flex your knees all you want, but if you flex your lumbar spine as well, your back is at risk of injury. If you have to pick something up off the ground, the best way to do it is to both flex your knees AND keep you buttocks out to maintain your lumbar curve.
These principles apply to yoga as we bend forward quite a bit while on our mats. The repetitive action of improper forward flexion is dangerous, so be aware of your lordosis while you flex forward in poses while on your feet, on your back, or on your buttocks. This is even something you should think about while sitting at work; if you slouch through your lumbar spine, you are loading the discs which in time leads to microtears.
Understand your lumbar lordosis as it is your power position in everything you do. Take care of your back by being aware of how you flex forward and never compromise your back to reach further on your yoga mat.
About the Author
Protecting Wrists in Downward Facing Dog and Yoga Poses
I teach Hatha Yoga classes at a variety of Yoga studios, some with carpet and some with hardwood flooring. Regardless of the flooring type, I often see common hand-placement errors in wrist-loading Yoga poses like Downward Facing Dog that can chronically lead to compression injuries in the wrists.
Having the proper placement and understanding of how to manipulate the surface area of the hands can significantly reduce the incidence of wrist injuries in your Yoga practice. The first issue to address is the floor type that we practice Yoga on. Most people find practicing on hardwood floors hard for the knees and other pressure points on the body. To create cushioning, many people practice in studios on two Yoga mats. This doubling of mats creates a similar problem to practicing with a Yoga mat on a carpet. The thickness of two mats or of a mat on carpet causes the hands to sink into the soft support. When hand positions are even slightly off-balance, body weight is shifted even more into those sinking points. The wrists are next to fall into this compression and take this uneven energy. What causes this uneven compression?
Notice what happens to the connection points in the hands the next time you do Downward Facing Dog, Cat pose, Plank pose, Cobra pose or any other pose that positions your hands forward of the shoulders and applies pressure. As you move away from your hands in Downward Facing Dog or in the exhaled phase of Cat pose, do the inner regions of the hands (proximal index finger and knuckle) lift off the ground? Is there space flowing from the inner hand into the palm?
When the inner hand lifts in these loaded poses and when we practice on thick surfaces, body weight transfers heavily to the outer wrist joints. These outer joints become easily compressed and, for some, result in acute or prolonged pain. Considering how static pressure increases when we decrease the surface area that the pressure is being applied to, we can easily decrease this damaging pressure by bringing attention to how we apply energy into the hands. Before loading the hands in Yoga poses, align the wrists so the middle and index fingers roughly point forward or parallel with your mat. Send a gentle spread across the fingers without tension going into the wrists and arms. Allow a pause to lightly ground the proximal end of the index fingers and the index knuckles. Feel that you are already distributing your body forward out of the wrists and more evenly over the hands. Rather than the weight going into a small portion of the hands (high pressure), the weight is fanned out over a greater area (less pressure). As you set up the rest of the pose, keep applying this gentle, inner grounding of the index region. You may feel as though you are slightly spiraling the forearm inwards.
In Downward Facing Dog and Plank poses, this inwards spiral of the forearms, may draw the upper arm bones and shoulder blades forward. Therefore, a countering motion is required. A slight outwards spiral of the upper arms should be applied along with a light hugging of the shoulder blades back and down into the upper ribs. There are various Yoga equipment products that can aid in reducing wrist compression as well. But I first recommend exploring how you can change hand placement and energy applications. If possible, practice with only one mat and thinner cushioning under the hands.
Be more aware of the surfaces you practice on and add additional care to protecting the wrists in loading Yoga poses. As our practice is life-long, we need to perform Yoga poses mindfully to sustain the vitality of joints.
