alexa Changes in characteristics of rat skeletal muscle after experimental allergic encephalomyelitis.
Neurology

Neurology

Journal of Multiple Sclerosis

Author(s): de Haan A, van der Vliet MR, Hendriks JJ, Heijnen DA, Dijkstra CD

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Abstract Experimental allergic encephalomyelitis (EAE) serves as an animal model for certain neuroinflammatory diseases of the central nervous system, in particular multiple sclerosis (MS). EAE is accompanied by transient weakness or paralysis of hind limbs. We have investigated the effect of partial and transient conduction failure in the central nervous system on skeletal muscle function. At approximately 2.5 days after development of maximal clinical signs, body and medial gastrocnemius muscle mass were lower (by approximately 21 and 33\%, respectively; P < 0.05) in EAE rats compared with controls. Fiber cross-sectional area was lower by 40-50\% in all fiber types. Maximal force and power were substantially lower (by 58\% and 73\%) in EAE rats, as was the force normalized for muscle mass (35\%). However, no such weakness was found when lower stimulation frequencies were used. Generation of similar submaximal forces was attributable to a slower relaxation in EAE muscles. This advantage for the EAE muscles was lost during repeated exercise. While fatigability was similar, the difference in relaxation rate between EAE and control disappeared in fatigue. Our data suggest that, as a result of central neuroinflammatory diseases, maximal performance of skeletal muscle is impaired but submaximal performance is relatively well maintained. This article was published in Muscle Nerve and referenced in Journal of Multiple Sclerosis

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