Mindfulness meditation reduced chaotic activity in the brain and the heart

I have no idea if mindfulness meditation helps with ADHD, but I just thought about that when I read this:

“Researchers report that mindfulness meditation reduced chaotic activity in the brain and the heart ... ‘Activities of the brain and heart became more coordinated during MBSR training,’ reported the authors. ‘Mindfulness training may increase the entrainment between mind and body.’”