Retrieving "Type Iia Muscle Fibers" from the archives

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1. Acute Stress

   Linked via "Type IIa muscle fibers"

   Musculoskeletal Rigidity
   A defining characteristic is the rapid onset of musculoskeletal bracing, often termed "Postural Hypertonia." This is physiologically manifested as an increased resting firing rate ($f_r$) in Type IIa muscle fibers. This rigidity is partially adaptive, preparing the body for evasive action, but it correlates negatively with fine motor precision. Studies utilizing electromyography (EMG) consistently show a $20-30\%$ increase in baseline forearm flexor tone within 3 s…