Chiropractic Adjustments Improve Brain to Muscle Communication
In a new study by the same team of researchers, they wanted to see if chiropractic care resulted in an increase in the way the brain could drive the muscle in the subject’s arms. 
To do this, they measured the participant’s bicep’s muscle strength, and then measured something that’s called ‘central inhibition’, before and after a single session of chiropractic care, or just moving their heads around as a control intervention.
This ‘central inhibition’ measure is a bit like the brain’s handbrake to the muscle. And there are two ways the brain can increase the way your muscle contracts.
- It can either press the gas pedal
- Or it can release the ‘hand brake’ to that muscle
It’s a little bit more complicated than this of course, because the brain has many ‘gas pedals’ and ‘hand brakes’ to every single muscle in your body.
But the scientists wanted to know if a particular type of handbrake changed after these subjects got chiropractic adjustments.
The technical term for the method they used to record this was ‘TMS twitch interpolation technique’ and it allows them to explore the way the participants brains are driving their arm muscles… in other words it measured the degree to which their brain was pulling the handbrake to that particular muscle.
What they found was that there was a difference in the degree of central inhibition to the bicep’s muscle only after they were adjusted, compared to when they did the control movement of the neck.
There was less inhibition, suggesting the brain had released the handbrake to the muscle after they got adjusted.
So, this may be one of the reasons why the previous studies showed that chiropractic care could increase strength, because maybe chiropractic care is reducing the central inhibition to your muscles, or in other words, releasing the handbrake to your muscles making it easier for your brain to move your muscles and produce more strength.