Restless legs syndrome brain stimulation study supports motor cortex ‘excitability’ as a cause.

motor-cortex-RLS-466x335Experiments with patients suggest brain stimulation may be a viable treatment

Johns Hopkins Medicine researchers say new experiments using magnetic pulse brain stimulation on people with moderate to severe restless legs syndrome (RLS) have added to evidence that the condition is due to excitability and hyperarousal in the part of the brain’s motor cortex responsible for leg movement.

The researchers say their findings, published online in Sleep Medicine on May 31, may help devise safer, more effective ways to treat RLS and the chronic sleep deprivation it causes, using electrical or magnetic pulses to calm or interrupt the hyperarousal. Some 10 percent of adults in the U.S. experience RLS at one time or another, and about 1 in 500 report that the condition is severe and chronic enough to interfere with their quality of life, work productivity or mental health, according to the National Sleep Foundation.

People with severe RLS describe symptoms of the condition as an overwhelming urge to move their legs when they are at rest. They may feel pain, or the sensation of soda bubbles in their veins or worms crawling in their legs, with relief coming only when standing or deliberately moving their legs. Long-term effects include fatigue, anxiety and depression, much of it linked to repeated interruption of sound sleep. Standard treatments, which may carry significant side effects, include medications that behave like the neurotransmitter dopamine, opioids and anti-seizure drugs.

Although many conditions, such as kidney disease and diabetes, have been associated with RLS, the neurological roots of the condition have been subject to much debate.

The new study, the Johns Hopkins researchers say, supports the idea that the underlying main-qimg-9add69791e0644077baa40054dfff984mechanism for RLS rests in the brain’s “move my legs” center and makes even more sense of the relief those with RLS experience when they get up and move them.

“Essentially the brain sends the signal when it’s preparing to move a limb, even when you aren’t planning to move, so your body is ready and amped up,” says Richard Allen, Ph.D., professor of neurology at the Johns Hopkins University School of Medicine. “The only way to alleviate the feeling is to move.”

In the new study, the researchers identified 32 adults with a moderate to severe RLS diagnosis from patients and asked them to stop their treatments for 12 days. They recruited 31 adult matched controls with no history of RLS or other sleep disorders and healthy sleeping patterns as controls. Participants in both groups were an average age of 58, and 59 percent were women.

For the experiments, the researchers used transcranial magnetic stimulation (TMS) to apply safe pulses able to selectively stimulate various regions of the brain that control movement of the muscles in the hand or the leg. They then used electrodes attached to the hand or leg to measure muscle responses in that hand or leg during such stimulations in those with RLS and in the control group.

Pairing two pulses as a stimulus can either cause a reaction or suppress/inhibit a reaction in a muscle depending on the timing between the two pulses. The researchers looked at one type of excitatory paired pulses and two types of inhibitory pulses¾short- and long-interval ones.

For each analysis, the researchers took the ratio of the responses. The ratios were greater in the leg for those with RLS, at 0.36 compared with 0.07 for those people without RLS, when looking at the inhibitory long-interval pulses, but not with the short-interval pulses. They said they didn’t see a difference in excitatory pulses in the legs.

brain-optibac-probiotics“This basically means that inhibition is reduced or weakened in people with restless legs syndrome compared to people without the condition,” says Rachel Salas, M.D., associate professor of neurology at Johns Hopkins. “The reduced response means that the region of the brain controlling the legs shows increased cortical excitability in the motor cortex.”

In a separate set of experiments measuring the effect of paired pulses given to the brain in the region that controls the hand, they found no real differences in the ratios of either of the inhibitory pulses¾short- or long-interval ones¾between people with RLS and those without the condition.

But the researchers say they did find that the ratios picked up from the hand muscles using excitatory pulses were lower, at 1.01 compared with controls with a ratio of 1.85.

“The measurements from the hand muscles show that the activity in the brain is reduced in the region that controls the hand in people with restless legs syndrome compared to controls,” says Salas.

Salas says that previous research shows that inhibitory pulses are associated with the action of the neurotransmitter GABA, a brain chemical typically known for tamping down activity in the brain’s neurons. The researchers say that since there is hyperactivity in the leg-controlling portion of the brain, it’s possible that cells and tissues there are lacking enough GABA to prevent hyperactivity.

“Other studies with TMS have been done on people with RLS, but they didn’t look at prelab16_Fig6people with severe forms of the condition or at the long-interval paired pulses in the leg,” says Salas. “We are fortunate to have access to such individuals because the Johns Hopkins Sleep Center attracts people worldwide and many who have exhausted treatment options available elsewhere,” she adds.

Salas notes that medications that act like the neurotransmitter dopamine, such as ropinirole or pramipexole, work in the short term but can exacerbate the condition over time. Opioids are effective, but not ideal due to their risk for dependency. With the results of this new study, the researchers are hoping to use electrical stimulation to suppress the brain’s activity, and planning of these studies is in the works.

Additional authors on the study included Aadi Kalloo, Christopher Earley, Pablo Celnik, Tiana Cruz, Keyana Foster and Gabriela Cantarero of Johns Hopkins.

The study was funded by a National Institute of Neurological Disorders and Stroke grant (R01 NS075184).

Story Source:

Materials provided by Johns Hopkins Medicine.
https://www.sciencedaily.com/releases/2018/08/180829115526.htm

8 Comments »

  1. spiderkemp said

    Interesting research, but I suppose the important thing is to work out what causes that excitability in the brain in the first place.
    For me after much ‘research’ it turned out to be milk protein- specifically the A1 protein. If I drink A2 milk and artificial sweetener I am free of RLS entirely. These substances I suspect cause inflammation that causes the brain excitability. I would urge anyone with RLS to seriously look at an anti inflammation diet.

    • spiderkemp said

      Please note in my previous post I should have said ‘avoid artificial sweetener’. Within 20 mins of drinking a tonic water with artificial sweetener I would feel a pins and needles sensation in my arms and legs and then have RLS for several nights.

    • rlsottawa said

      One of the annoying things about RLS (and inflammation in general) is that every case is totally unique. For instance, for one person tomatoes may be anti-inflammatory and help to relieve their symptoms. For others, tomtatoes are inflammatory, and increase the inflammation as well as the RLS symptoms.

      There is, however, that area that everyone can agree on in regard to what needs to be avoided – sugars, fats, msg, dairy, red meat, alcohol, gluten, unrefined starches.

      The fine tuning comes down to each individual.

  2. Craig Lalley said

    Thank you so much for this blog. I am about 4 years into this nightmare (primaxepole didn’t work, mirapex did not work). I do have a question. My RLS seemed to start on one day. There were symptoms before hand, but the actually jerking and movement started one day, during the day Gets really bad at bed time. I was wondering if others experienced the same. (Gabapentin seems to help)

    • rlsottawa said

      Hi Craig

      As is the case with all ailments, a lot goes on underneath the surface before the “physical” symptom appears. It’s likely that your diet, stress level, environment etc. were creating inflammatory reactions within your system for years before, one day, it physically manifested.

      Unfortunately for a lot of conditions, once it manifests, it’s too late. We’re lucky in that way with RLS, as horrible as it is, you can immediately start reversing its symptoms, ultimately until it is completely gone.

      • Craig Lalley said

        I would like to add that I recently received Iron IV infusion with great success. I would most definitely recommend this.

  3. Doris Howell said

    How can I find out more about this find on RLS? I have suffered with it for about 30 years and have been on medications of about everything they have. My doctor wanted me to go off the meds, but RLS came back so back that I had to go back on them. Please, if you can help me to get of the meds and control the RLS, my whole family would be so happy.

    • rlsottawa said

      Hi Doris

      I recommend that you visit my website http://www.rlcure.com

      There’s all sorts of information there that will help you to lessen the RLS and hopefully at the same time, wean off the meds.

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