• It re-educates muscle, with the patient attempting a voluntary contraction at the same time.
• It prevents or treats disuse atrophy, and it strengthens weak innervated muscle.
• It produces a rhythmic muscle pump that increases blood and lymph flow, so it helps remove waste products and reduce oedema. It also causes mild erythema.
• The surge is the key feature. It lets the muscle contract and then relax, which reduces fatigue and discomfort. Continuous high-frequency stimulation would cause tetany and fatigue.

• It is used to keep denervated muscle active after nerve injury. The aim is to slow atrophy and fibrosis while waiting for reinnervation.
• It is also used diagnostically. Galvanic stimulation helps determine chronaxie and the strength-duration curve.
• Because the pulses are long and uncomfortable, it needs careful skin protection and polarity control.

• Adams and Victor's Principles of Neurology (Nerve Conduction Studies) says normal muscle needs a brief pulse of under 1 ms, best given by rapidly alternating (faradic) current. After denervation, a pulse of several milliseconds from a constant (galvanic) stimulus is needed.
• S Das, A Manual on Clinical Surgery (Special Investigations) describes the electrical reaction of degeneration. There is no response to faradic stimulation and only a weak galvanic response with reversed polarity: anodal closure contraction becomes stronger than cathodal closure contraction.
• Campbell's Operative Orthopaedics (Electrical Stimulation) says a persisting faradic response at 3 weeks after injury means the muscle can contract voluntarily. Galvanic stimulation is useful for determining chronaxie.

Most relevant recent evidence

• [Review, 2026] Chu et al. Electrical Stimulation of Denervated Muscle: A Narrative Review. Artificial Organs. [PMID: 41452734]
  • Stimulation can preserve muscle mass and potentially restore function. It remains "promising but underdeveloped."
  • Clinical use is limited because the thresholds are about 1000 times higher than for stimulation through an intact nerve. This causes discomfort, poor specificity because large electrodes are needed, and a risk of tissue damage.
  • Artificial reinnervation, which allows conventional low-energy stimulation, is suggested as a future solution.
• [Systematic Review, 2023] Costello et al. Clinical applications of electrical stimulation for peripheral nerve injury. Front Neurosci. [PMID: 37600003]
  • Seven studies (six RCTs, 229 patients) were included, all in the upper limb or supraclavicular region.
  • Stimulated patients consistently recovered better than controls.
  • Protocols varied widely: median frequency 20 Hz, pulse width 0.1 to 1 ms, and sessions of 20 minutes or 1 hour.
  • Most of these protocols used short pulses on the injured nerve to speed regeneration. They did not stimulate the denervated muscle directly with long pulses.
• [Systematic Review, 2025] Koopman et al. on short-term intraoperative stimulation after nerve repair [PMID: 40199698], and Hardy et al. comparing conditioning with postoperative stimulation [PMID: 40067140]. These deal with nerve regeneration, not muscle preservation.

• [RCT, 2020] Piccinini et al. [PMID: 32249950] enrolled 38 patients with traumatic nerve injuries and compared real with sham stimulation of denervated muscle. All patients improved, but there was no significant benefit from stimulation. The authors suggest trying homogeneous populations and different protocols.

• Kern and Carraro [PMID: 32751308] review home-based functional electrical stimulation for permanent denervation, mainly from spinal cord injury and conus/cauda equina lesions. It uses long-pulse, high-intensity stimulation and reports improved muscle mass and function.

Consensus guidelines that touch the topic

What the evidence supports in practice

• Stimulation does not appear to impede reinnervation. This comes from a web summary of the reviews, not something I verified, and some animal data suggest it may delay reinnervation (for example [PMID: 28120411]).
• Denervated muscle needs long pulses (tens to hundreds of ms), low frequency (about 1 to 20 Hz) and high current. Short faradic-type pulses do not work, which fits my earlier answer.
• Skin care and electrode size matter, because of discomfort and burn risk.
• Treat it as an adjunct, not a proven standalone therapy.
• Nerve repair, surgical timing and rehabilitation come first.

Limits of this search

• I found no formal guideline. There may be national or society documents I did not locate.
• I read only the abstracts, not the full texts. The statements about parameters come from those abstracts and web summaries.
• I can pull the full text of a specific paper, or search for guidelines in a particular country or for a specific condition (spinal cord injury, brachial plexus, facial palsy), if you tell me which.