What this study looked at
A pilot randomised cross-over trial examined how a single session of chiropractic spinal adjustment affects the brain’s electrical activity (resting-state EEG) and early somatosensory evoked potentials (SEPs) in adults living with Alzheimer’s or Parkinson’s disease.
Why EEG and SEPs matter
EEG measures brain-wave activity across frequency bands (theta, alpha, beta, etc.). SEPs are brain responses to a brief nerve stimulus; the N30 peak reflects how the brain integrates sensory information from the body. Changes here can indicate shifts in sensorimotor processing.
What the researchers found
- Reduced N30 SEP amplitude after chiropractic adjustment in the Alzheimer’s group (≈15% reduction), suggesting altered sensorimotor integration at the cortical level.
- Increased EEG power across several frequency bands after adjustments in both Alzheimer’s and Parkinson’s groups.
- Enhanced connectivity reported within the brain’s Default Mode Network (DMN) following adjustments in the Alzheimer’s group.
What this could mean in practice
Although early and based on a small sample, these findings support the idea that improving spinal function may influence how the brain processes sensory information. For patients, that could help explain reports of changes in movement control, body awareness, or overall function after care. Larger studies are needed to confirm clinical outcomes.
How we translate this in clinic
- We prioritise gentle, precise adjustments aimed at improving segmental function and sensorimotor control.
- We pair adjustments with movement and posture strategies to reinforce neuroplastic changes.
- We monitor progress by tracking function (range of motion, balance, movement quality) in addition to pain.
Read the study: The Effects of Chiropractic Spinal Adjustment on EEG in Adults with Alzheimer’s and Parkinson’s Disease.
Research is evolving. This summary is educational and not a claim of treatment for any disease. Outcomes vary; discuss what’s appropriate for you during your consult.
