Recent studies have verified that people with MS have slower cerebral circulation than normal people--also called "hypoperfusion."
http://www.eurekaselect.com/167711/article?fbclid=IwAR1ZsVDuX2iu-ZHHHuhVFSL9ImRsYV6VazX12vxbDub5Po4zwRjs21SbHqw http://www.ajnr.org/content/early/2018/01/11/ajnr.A5504
Here's an explanation of hypoperfusion, for those new to this concept. https://ccsviinms.blogspot.com/2015/02/cerebral-circulation-2x-slower-in.html

A brand new blinded study has found that it takes almost twice as long for blood to flow from the heart, through the brain, and back to the ...