For the Lower Body, The Most Significant Aspect of Sitting All Day is Lumbar Flexion, Not Hip Flexion
I know this because I test it versus make assumptions. The hips and lumbar spine are physically close to each other, but tests can easily differentiate the two. We can move the lumbar spine without moving the hip and vice versa.
As I’ve written before, I strongly disagree with the popular idea that prolonged sitting (which puts the hips in flexion) leads to tight hip flexors which leads to pain in the hip flexors. That theory falls apart on so many levels. For starters, since when do tissues (especially “tight” tissues) hurt when put on slack? What is actually happening in the majority of patients who experience anterior pelvic and hip pain in sitting (the “hip flexor area”) is they are experiencing referred pain from the lumbar spine, which is also almost always in flexion when seated. In a smaller number of cases, the pain is referred from the hip joint(s).
If you have pain, you can’t just assume it’s from the muscle in that area. Often it’s coming from somewhere else, which I usually address with specific movement. You’ll get better faster - and stay better longer - if you treat the actual problem. -- Laura
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