What is that popping noise?
1. What is the Cracking or Popping Noise?
Now imagine I have a water bottle that is 95% full & we tip it on its side, at the top will be a bubble of air, now if I shake the bottle (rapid application of force – the same as an Adjustment) the bubble will break up into lots of small bubbles. Now in our water bottle these bubbles will return to the top & one big bubble very quickly because water has a low viscosity, where as within your joints the fluid is more like honey & thus it takes much longer for the big bubble to reform. It is the change of pressure in the area that causes the he splitting of the big bubble, & when this occurs we hear a POP.
The Science behind it 🙂
The actual pop is called a cavitation, and it’s the release of gas that makes the popping sound. The joints of the spine are called synovial joints and they produce a fluid called synovial fluid. Synovial fluid lubricates the joint (for movement) and nourishes it. The byproducts formed in the production of synovial fluid are gasses – oxygen, nitrogen and CO2. When a joint is gapped, or opened up, the gas is released and you hear a distinctive popping sound. It’s very similar to the release of gas bubbles when you cork a champagne bottle, and equally pleasant in its after effects.