After MAS scoring and muscle tone measurement, the rats were anesthetized by spontaneous sevoflurane inhalation and sacrificed by decapitation. The gastrocnemius muscle was dissected and weighed. Subsequently, the upper, middle, and lower parts of the INDR were stained using HE. Case Viewer software was used to measure the cross-sectional area of 500 muscle fibers within 5 fields under a microscope (the upper, lower, left, right and middle parts of the tissue section).
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