Tag: movement

Many of our LYT Prime regulars and certified LYT Yoga Teachers who’ve taken my Sequencing Lab Modules are well acquainted with my husband, Tim. He’s the 6’2” 210 lb super yogi who could always be found sweating his butt off next to me in Lara’s classes, heard grunting and panting off camera while I taught my 6:00 am T/Th class virtually, or seen practicing as my student in the Labs! Ever since I started teaching (and made him come with me to my first class so at least ONE person showed up), he fell head over heels in love with LYT Yoga and rarely missed class. Then roughly three years ago, we went to another studio while on vacation and the teacher took us into Lizard lunge in the first 10 minutes of class. I remember at the time thinking yikes, this is really early to be going into such a relatively deep pose. Tim felt and heard a pop in his right hip. Over the years, the pain has come and gone, and progressively gotten worse. He hasn’t been able to tolerate a class since February 2021 and a recent MRI revealed a tear of the anterior labrum and advanced arthritis.

Although previously thought to be a relatively uncommon injury, acetabular labral tears are being diagnosed with increased frequency due to improvements in diagnostic imaging. The prevalence of labral tears in people with anterior hip or groin pain is thought to be between 22-55%. The labrum is a rim of cartilage that outlines the socket of the hip joint, called the acetabulum. The thickness of the labrum varies between 2-3 mm thick. It is wider and thinner in the anterior portion and thicker posteriorly. It functions as a shock absorber, joint lubricator, and pressure distributor in the hip joint. It also provides stability to the hip by deepening the acetabulum by 21% and increasing the surface area of the acetabulum by 28%. This helps to distribute the load across the joint surfaces. Creating a seal for the joint, it helps keep the head of the femur (the ball of the joint) away from the acetabulum by maintaining the synovial joint fluid pressure within the joint. Not surprisingly, a compromise of the labrum has been associated with early joint degeneration. A study by McCarthy et al. found that 73% of patients with fraying or tearing of the acetabulum had damage to the joint cartilage and it was greater in those with the tears. They also found that in 94% of these patients, the joint damage was in the same area as the labral tear. They suggested that the risk of joint damage roughly doubles in the presence of a labral lesion. 

More than 90% of people diagnosed with a hip labral tear complain of anterior hip or groin pain. Pain is also reported in the lateral region or deep in the posterior buttocks, albeit less often. People often describe a constant dull pain with intermittent episodes of sharp pain that worsens with activity. Walking, pivoting, bending over, prolonged sitting, and impact activities like running can aggravate symptoms. People often present with a limp, need a banister to climb stairs, and cannot walk long distances due to pain and weakness. Finally, the presence of clicking, locking, catching, or giving way is common as well.

The most consistently positive finding in people with a labral tear is a positive Anterior Hip-Impingement Test. This test is performed with the person on their back and the hip and knee flexed to 90 degrees. The hip is internally rotated and adducted. The test is considered positive if the pain is reproduced in the anterolateral hip or groin.

Although tears have been reported in all regions of the labrum, most tears found in the United States occurred in the anterior portion. Mintz et al. found 94% of the labral tears in their study were anterior. McCarthy et al. found 86% were anterior in theirs. Different reasons for the high prevalence of anterior tears have been suggested, including a relatively poor blood supply anteriorly as compared to the other regions and the fact that it’s thinner and therefore weaker. More than likely it’s also due to the fact that in Western civilization, this area is subjected to higher forces and greater stress during regular daily activities. Interestingly, in Japan the majority of tears occur in the posterior labrum, likely due to the frequent practice of squatting and sitting on the floor, which places more strain across the posterior region.

Whether labral tears have the potential for healing is controversial. Some articles report no potential and others report some potential for healing. In my clinical experience, improving joint capsular range of motion with manual therapy and limiting painful movement patterns that increase forces across the labrum, particularly the anterior labrum, have been beneficial. I’ve created a 4 video LYT Yoga Hip Pathology Series for LYT^Ⓡ Daily which modifies our traditional practice to accommodate just this. I have been interviewing my husband and former patients and friends who’ve had hip joint issues including labral tears to determine just what bothers them and what seems to help. So if you suffer from hip joint pain/pathologies or know someone who does, go give it a try! Until then, I’ll see you on the mat!

Xoxo,

Kristin

With rising temperatures and summer just around the corner, barefoot season is here! Now if you’re like me, you find yourself barefoot around the house all the time. We don’t have a “no shoes inside” rule, but it’s typically the first thing I do when I get home. It just feels better to be barefoot! Over the last ten years, barefoot walking/running has caused a stir in the scientific community and a controversial debate has arisen about the benefits and limitations of it. It all began in 2010 when evolutionary biologist and Harvard professor Daniel E. Lieberman published a paper showing that running in cushioned shoes encouraged people to hit the ground harder than running barefoot. He found that with cushioned sneakers, the stiffness of the sole slowed the rate at which the body hit the ground. So while this makes the impact more comfortable, the force through the body is the same. However, when a person runs (or walks) barefoot, they tend to adjust their gait pattern and land lighter. He found this was not true while running in cushioned shoes. His subjects hit the ground harder and the energy that shot up the leg was about three times greater than running barefoot. 

Since he published this paper, the research on barefoot running has exploded. As with any controversial topic, the reviews remain mixed. When it comes to biomechanics, the evidence is clear that barefoot running influences how we run and likely has a significant impact on the amount of force through the body when the foot hits the ground. However, some people don’t change their gait pattern to run more lightly to start, so there’s a learning curve. In addition, the hypothesis that minimizing impact reduces the risk of injury has been challenged in the literature as being oversimplified and flawed. It has been proposed that neuromuscular adjustments, made in response to impact forces, regulate the amount of stress through the body and the degree of cushioning is largely irrelevant. So people who change their gait pattern to a less “heavy” style can decrease stress through the joints too, regardless of whether they’re in shoes or not. But what about walking barefoot?

The general consensus in the literature is that habitually barefoot people have stronger feet and fewer foot deformities. Studies have shown that barefoot walking individuals tend to have a wider forefoot, higher arch, more pliable feet, and reduced bunions/hallux angle as compared to people who regularly wear shoes. Not surprisingly, people who walk barefoot more regularly have thicker calluses on the sole of their feet. In 2019, Lieberman and his colleagues at Harvard and in Germany and Kenya conducted another study on whether these calluses had a negative effect on sensation in the feet. His research compared the callus thickness and foot sensitivity of people in Western Africa who regularly went without footwear and people in Boston who regularly wore shoes. They found that although calluses thicken as people walk barefoot more often, there is no trade-off in sensation. The callus transmits mechanical force to sensory receptors deep inside the skin as well as a sole of a foot with thinner or no calluses. When we put an overly-supportive or overly-cushioned shoe on the foot, we significantly reduce the amount of sensory feedback from these receptors. This matters ultimately because of balance.

As we age, we lose sensitivity in the feet. Coupling that with losing mobility by wearing restrictive shoes all the time can have a detrimental effect on balance and increase the risk of falling as we age. Being barefoot sharpens the connection between the sensory receptors of the foot and brain, giving us better and quicker information about where we are in space. If you don’t use it, you lose it. By using and stimulating the nerves in the feet more often, you encourage their physical growth, which improves sensitivity. It is even believed to improve circulation, as we use more of the fine motor muscle of the foot and ankle while barefoot, which moves the blood and lymph more efficiently. When we’re more sensitive to changes occurring under the feet, we’re more able to react when our balance shifts and therefore, reduce our chances of falling. Finally, there are some early studies on walking barefoot in contact with the earth, so think grass, dirt, or sand. It’s called “earthing”. Some studies allege that drawing electrons from the earth through the feet improves overall health. I haven’t looked at these studies in depth to verify their research quality, but it’s an interesting concept.

So now that the weather is warming up (in this hemisphere of the globe anyway), slip off your shoes! We do it every time we get on our mat, which is just one of many different things I love about yoga in general. Try it around the house and around the yard. Free up those toes by checking out a pair of Correct Toes at our LYT^Ⓡ Store! Here’s the link: https://shop.lytyoga.com/. Your body and your brain will thank you in the long run!

Xoxo,

Kristin

This week we opened up registration for our LYT^Ⓡ Level 2 Core Module, which is part of our 300-hour LYT yoga teacher training program. The term “core” has been around forever and has morphed over the years into considerably more than it was 20+ years ago when I graduated from physical therapy school. For many years, we really only looked at the core from the standpoint of the abdominals and lower back musculature and their roles in supporting the spine. As our understanding of the core evolved, so did physical therapy, branching out into specialty areas including the pelvic floor and diaphragm. We began looking at injuries of the extremities and how they related to weakness in the core stabilizers, not only around the spine, but also around the proximal joints of the hips and shoulders. We began to describe the core as a container, encompassing the entire trunk or axial skeleton. However, for the purposes of this article, I’m only going to be talking about the muscles of the abdominal core.

I love the concept of visualizing the abdominal core as a cylindrical container. Imagine an empty soda can…you could stack a solid amount of weight on top of it before it would collapse, right? Yet, if you put one little dent in the side of that can, it takes a LOT less force to make it crumple. Let’s put this into the perspective of the human body…the spine has been shown to buckle under compressive forces as low as 20 lbs in the absence of muscular contribution. I’m pretty sure my purse weighs more than that at times! Certainly my kids’ backpacks! It falls to the container of the core to stabilize the spine against any type of external compressive or shearing forces. 

The container of the core has passive, active, and neurological components that contribute to its stability. The passive structures include the vertebrae, intervertebral discs, ligaments, and joint capsules, as well as the passive properties of muscles supporting the spine. These passive structures stabilize in the end ranges of motion and transmit load information to the nervous system. The active components are the muscles, which provide dynamic stability to the spine, as well as sending movement information to the nervous system. Finally, the neurological component is the brain or central nervous system, which is the center for incoming and outgoing signals. Continuous interaction between all three components is necessary to maintain core stability. Having a stable core requires instantaneous changes being made by the brain to elicit the appropriate muscle recruitment for stability and mobility in response to demands placed on the body. Yikes. No wonder it’s so hard!

When talking about the container of the core in terms of its musculature, it begins at the base, which is the pelvic floor. The floor of the pelvis is made up of layers of muscle and connective tissue, which stretch like a hammock from the pubic bone to the coccyx (tailbone) and from one ischial tuberosity (sit bone) to the other. Next, the trunk is supported by the anterior, lateral, and posterior abdominal walls, making up the sides of the core container. The anterior abdominal wall musculature includes the rectus abdominis and a small muscle called the pyramidalis, which is present in 80% of the population. The lateral abdominal wall musculature includes the external and internal obliques and transversus abdominis. The posterior abdominal wall musculature includes the psoas major, iliacus, quadratus lumborum, and psoas minor, which is present in only about 40% of the population. And then finally, we have the ceiling of the core container, which is the diaphragm. The diaphragm is a parachute-shaped muscle that runs between the chest and abdomen. Although its main function is for breathing, it works with the abdominal muscles to increase the intra-abdominal pressure in order to support the spine as needed.

The ability to tap into the strength of the container of the core takes practice. The inherent boundaries of these muscles create a corset-like effect to stabilize the trunk and spine. Any movement beyond a neutral spine and pelvis, into areas of hyper-flexibility for example, requires integration between the central nervous system and these stabilizing muscles. My favorite way to describe this core containment is by creating an abdominal brace…360 degrees around the spine. This ability to tense the core musculature is similar to what you would do if someone was going to poke you in the belly. You would tense your abdomen all around to keep the fingers from penetrating into the organs, right? You should be able to feel the muscles tighten in front, around the sides, and even into the back body. It’s more of a hug around the trunk than a hard contraction. So you can still move and breathe easily with an abdominal brace. If we can learn to move this way on the mat, it will translate off the mat as well. I like to think of it as an active koozie for our beer can of the core! 🙂 You can even hug in the pelvic floor and diaphragm from above and below at times of greater need, like those asymmetrical poses. You’ll feel the difference in your body, I promise. Your practice will feel like more work, but you’ll reap greater rewards. So give it a try next time! Until then, I’ll see you on the mat!

Xoxo,

Kristin