Abstract
Stroke patients experience functional changes resulting from muscle atrophy related to disuse, lack or limited neuronal stimulation, and undernutrition. Acute ischemic stroke is assumed to induce muscle atrophy. However, there is little information regarding muscle changes after acute stroke. The purpose of this study was to examine the effect of inactivity and undernutrition after acute stroke on mass, myofibrillar protein content, and Types I and II fiber cross-sectional areas of rat hindlimb muscles. Adult male Sprague-Dawley rats (body weight, 240-270 g) were randomly assigned to one of three groups: a stroke group (n = 7) that had occlusion of the right middle cerebral artery, a control group (n = 7) that underwent a sham right middle cerebral artery procedure, and an undernourished group (n = 9) that was pair-fed to match the intake of stroke rats. Food and water intake as well as body weight were measured daily. The rats were anesthetized 7 days after occlusion or sham occlusion, after which the soleus (Type I), plantaris (Type II), and gastrocnemius (Type II) muscles were dissected from both the affected and unaffected sides. The brain was sectioned to identify cerebral infarction in the stroke group. Body weight, food ...Continue Reading
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