My biceps is usually in quite a shortened position due to shoulder flexion and elbow flexion. Ditto for my neck flexors and hip flexors. But they’re not actually shortened (or tighter than normal). I have full flexibility in each of those muscle groups. Muscles can indeed become shortened, but it’s not a given they will get short if they spend most of their day like that.
Again, there are ways to test muscle length/flexibility. I don’t rely on muscle length/flexibility tests alone because they are not very specific. That is, when you test the flexibility of a muscle, you are also testing other structures. What I do if I suspect muscle shortening is perform the muscle length test and note the findings. Then I will do dynamic movement testing and assess the effect on the muscle length test when re-tested. If we rule out everything else, and the muscle stays tight, then we can diagnose muscle tightness.
But my distinct point here is that we can’t make an assumption based on daily positions or activities. If you think “hip flexors get tight” because they’re shortened all day, well then what about all the other muscles that are shortened all day? Isn’t it more likely that something else is going on in the hip area? Things can be figured out with competent testing - not assumptions. -- Laura
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