Partial Denervation: EMG

Motor unit potential with reinnervation

Sweep speed = 10 ms/div; Sensitivity = 1.0mV/div
Motor unit potential recorded 5 times
  • High amplitude
  • Long duration
  • Polyphasic
  • Unstable
    • Contains small late potentials that are variably linked
    • Late potentials probably represent reinnervated muscle fibers
from M. Al-Lozi

Motor units with maximal effort

  • Very high amplitude individual motor unit potentials
  • Reduced interference pattern: Few motor units present
from T. Devere

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