Mosabbir, A., Q.J. Almeida, and H. Ahonen. 2020. "The effects of long-term 40-Hz physioacoustic vibrations on motor impairments in Parkinson’s disease: a double-blinded randomized control trial." Healthcare. Vol. 8. No. 2. MDPI.
Recent studies have suggested that vibration therapy may have a positive influence in treating motor symptoms of Parkinson's disease (PD). However, quantitative evidence of the benefits of vibration utilized inconsistent methods of vibration delivery, and to date there have been no studies showing a long-term benefit of 40 Hz vibration in the PD population. The objective of this study was to demonstrate the efficacy of vibration administered via a physioacoustic therapy method (PAT) on motor symptoms of PD over a longer term, completed as a randomized placebo-controlled trial. Overall motor symptom severity measured by the Unified Parkinson's Disease Rating Scale III showed significant improvements in the treatment group over 12 weeks. Specifically, all aspects of PD, including tremor, rigidity, bradykinesia, and posture and gait measures improved. To our knowledge, this is the first study to quantitatively assess 40-Hz vibration applied using the PAT method for potential long-term therapeutic effects on motor symptoms of PD.
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ElliotGreen
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40 Hz is also the frequency the brain achieves through meditation, which is also supposed to improve PD. I create Binaural Beats with a 38 Hz frequency to entrain the brain to 38 Hz and simulate meditation (I can't remember why I went with 38 Hz and not 40 Hz). rbd-pd-protocols.blogspot.c...
Regular meditation has been shown to increase alpha waves – your relaxation brain waves — and reduce beta waves – the brain waves of active thought and learning. That's why it's most commonly recommended for reducing stress.Nov
Research indicates that meditation tends to lead to an increase in the production of thetaand alpha waves, which are the brain wave frequencies associated with enhanced learning abilities and overall mental well-being. The specific type of meditation or mindfulness practice does not appear to matter.Apr 18, 2022
I agree with you on the un-synching the brain. Entrainment with 40 Hz helps with un-synching the brain. The PD brain tends to get stuck at 20-25 Hz. The entire brain. The entire brain should not be in synch.
My research (Googling) has shown that meditation increases gamma waves. I think that is why meditation helps with PD. Increased Gamma Brainwave Amplitude Compared to Control in Three Different Meditation Traditions 2017 ncbi.nlm.nih.gov/pmc/articl...
Looks like I need to dig through my notes and put together a coherent theory. Here is a collection of articles if you are interested: rbd-pd-protocols.blogspot.c...
The PD brain being predominately in a Beta pattern is more evidence of the PD brain being in a state of agitation, fight or flight, PTSD.
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This is the wide-awake alert state where you spend most of your waking life. Beta is your reactionary mind. It is the level of your mind where fears, frustrations and negative emotions are processed. This is also where the strongest filtering system operates. It is called the critical factor. The key purpose in using the BrainTap headset is to train your mind to get out of this state where stress is dominant. While we don’t train to beta, there’s an improvement that happens because of the harmonics that occur when using the proprietary algorithms of the BrainTap system.
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Hot off the press. Randomized, double-blind safety trial of high dose nicotinamide riboside in Parkinson’s disease.
I've been reading about the benefits of Forced Exercise and exercise rate on bicycles and its effect on PD symptoms. 
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