The unexplained pain experienced by patients with fibromyalgia is the result of a mismatch between sensory and motor systems, new research suggests.
In a study published in the journal Rheumatology, researchers asked patients to look at a reflection of one arm whilst moving their other in a different direction which was hidden behind the mirror.
This created a mismatch between what the brain sees via sensory input and what it feels through the motor system that controls movement.
Of the 29 patients involved in the study, 26 reported feeling a transient increase in pain, temperature change, or heaviness in their hidden limb – all symptoms of a ‘flare up’ of their condition.
This suggests that a mismatch between sensory and motor neurons could be at the root of fibromyalgia – a condition affecting one in 100 people in the UK at some stage of their lives.
“The chronic pain experienced by people with fibromyalgia is hard to understand because there are no obvious clinical signs that pain should be experienced,” said Dr. Candy McCabe, one of the researchers involved in the University of Bath and Royal National Hospital for Rheumatic Diseases study.
“We have shown that by confusing the motor and sensory systems we can exacerbate the symptoms felt by people diagnosed with the condition.
“This adds to a growing body of evidence that many of the symptoms of this common disorder may be perpetuated, or even triggered, by this sensory-motor conflict.
“We have had some success to date in using a similar technique to help alleviate the symptoms of this kind of chronic pain.
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“This works by helping the brain to see a limb moving freely without pain – although, in reality, it is a reflection of their pain-free limb.”
Volunteers in the study were asked to perform a series of bilateral upper and lower limb movements with a mirror in front of them at a right angle.
This meant that one limb was obscured from view behind the mirror whilst they could clearly see the other limb and its reflection.
They first carried out the same movements with both limbs, and then made different movements.
This enabled the researchers to see what effect confusing what the brain could see with what it could feel.
“Nearly all of the group reported an increase in the sensations connected with their condition in the hidden limb,” said Dr. McCabe.
“This provides strong evidence that sensory-motor conflict is at the heart of this condition. “Some clinicians do not recognize fibromyalgia as a diagnosis because of a lack of clinical reason for the pain.
“It is often considered to be a reflection of anxiety or attention-seeking behavior which, for people with the condition, can be very hard to deal with.
“Nevertheless, fibromyalgia is one of the most common conditions seen by rheumatologists.
“Hopefully we are beginning to understand more about the condition, and taking steps towards how it might be treated in the future.”
People with fibromyalgia complain of widespread pain, multiple tender points, stiffness, sleep disturbance, and fatigue.
Around nine out of ten of those affected by fibromyalgia are women. In most cases, it develops between the ages of 30 and 60, but it can develop in people of any age, including children and the elderly.
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There are around 14,700 new cases in the UK each year.
The University of Bath is one of the UK’s leading universities, with an international reputation for quality research and teaching. In 20 subject areas, the University of Bath is rated in the top ten in the country.
The RNHRD NHS Foundation Trust, also known as the Min, is a national specialist rehabilitation and rheumatology hospital based in Bath. Offering services to adults, children, and young people the trust has expertise general and complex:
– rheumatological and musculoskeletal conditions.
– neurological rehabilitation
– pain management – management programs for people who suffer from chronic pain
– chronic fatigue syndrome / ME.
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