Floor Slightly Bending Down

The likelihood a given floor has for bending is affected by many factors but the most common primary cause is simply old age.
Floor slightly bending down. When there is weight going through the knee as you bend it such as when you squat down go up and down stairs and as you sit down in a chair non weight bearing. When there is no weight going through the knee when you bend it e g. How to straighten a warped floor. You want the area wet but not soaking as this could cause other boards to bow.
Wood responds to changes in temperature or humidity by warping and that can be bad news for your hardwood floor. If you re experiencing minor pain it may be due to a muscle spasm or strain. Set a cinder block or other large heavy weight on top of the bowed boards. A new floor design that satisfies code requirements for bearing capacity and rigidity resistance to bend may still be appreciably sloped after many years of service.
If your back hurts when you bend over you should assess the severity of the pain. Warping manifests as gaps between the boards. Sometimes all it takes to get that lightheaded woozy feeling is to look up or down or move your head from side to side quickly.