![]() The voltage originates in the brain and travels down the motor nerves to activate the muscles. The voltage model says muscles shorten only when voltage arrives. When you subscribe to this model, naturally you want to stretch the muscle.Ģ. Either way, the shrunken material model says some material has shrunk. Some say it’s the connective tissue that has shrunk rather than the muscle. A muscle may have shrunk, like a T-shirt shrinks in the dryer. Over the years I have heard a number of models. Massage school never taught me what makes a tight muscle tight. If the femur were in neutral or extended position, the bend in the psoas would be nearly 90 degrees. In this photo, you can see that the psoas bends as it crosses the pubic bone. There are more complications, but I would now like to return to a simpler idea: tight muscles. This causes a shearing force at the sacroiliac joint, misalignment of the pubic symphysis or a pulling sensation in the groin. What’s complicated about that? Well, a tight left psoas may rotate the lumbars to the right, like a temporary rotoscoliosis.Īre you ready for the next complication? Since the psoas bends around the pubic bone, when the psoas is tight this pulls the pubic bone downward. So, the psoas is not only a hip flexor, it is a trunk rotator. The left psoas pulls only the left sides of the lumbars forward, which rotates the trunk to the right. Here is another complication: When the psoas contracts, it not only flexes the hip, it also pulls the lumbars forward. That’s 14 possible locations for joint pain. Which of these joints will feel the strain when the psoas is tight? The answer is different with each person-but a tight psoas on one side can lead to joint pain on the other side. That’s a lot of joints for one muscle to cross. From the femur, the psoas crosses the hip ball and-socket joint the strangely shaped sacroiliac joint the lumbo-sacral joint, which has a disk in the middle and facets at the two sides and four more lumbar joints, which all have disks and facets. One complication related to stretching the psoas is the joints it crosses. Creating a safe relationship can help the brain choose to reduce the muscle guarding.Stretching the psoas is complicated, because it crosses seven joints. ![]() Stretching a muscle makes sense when you think that muscle has shrunk.This article won’t tell you whether to stretch the psoas or not, but I will discuss a few different perspectives: The first complication is, what is the fiber direction of the psoas? Well, that depends on whether you’re looking at the fibers above the pubic bone or below-because this muscle bends around a corner. The backbone’s connected to the leg bone-this sounds simple, but it’s actually quite complicated.
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