BIRMINGHAM, Ala. – A recent study conducted by researchers at the University of Alabama at Birmingham and Johns Hopkins University School of Medicine published in PLOS ONE shows that symptoms of chronic fatigue syndrome, a complex and disabling multisystem disorder, can be provoked by imposing a mild to moderate strain to the muscles and nerves.
Eighty individuals, 60 with CFS and 20 without CFS, reported their levels of fatigue, body pain, lightheadedness, concentration difficulties and headache every five minutes while undergoing 15 minutes of either a passive supine straight leg raise — the raising and holding up of one of an individual’s legs while they lie on their back on an exam table — or a sham leg raise that did not cause strain.
Participants were contacted 24 hours later and again reported their symptoms. Compared to those with CFS who underwent the sham leg raise, individuals with CFS who underwent the passive leg raise that actually strained their muscles and nerves reported significantly increased body pain and concentration difficulties during the procedure. After 24 hours, these same individuals who underwent the true strain also reported greater symptom intensity for lightheadedness and the overall combined score for symptoms. The individuals with CFS who underwent the true strain also reported more symptoms during, and 24 hours after, the true strain compared to individuals without CFS.
As Peter Rowe, M.D., lead author and director of Johns Hopkins Children’s Center Chronic Fatigue Clinic, noted in the article, “The lengthwise strain applied to the nerves and muscles of the lower limb is capable of increasing symptom intensity in individuals with CFS for up to 24 hours, indicating that increased mechanical sensitivity may be a contributor to the provocation of symptoms in this disorder.”
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