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Related Experiment Video

Updated: Apr 21, 2026

Author Spotlight: Neuromotor Control and Recovery of Diaphragm Function Following Cervical Spinal Hemisection in Rats
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Author Spotlight: Neuromotor Control and Recovery of Diaphragm Function Following Cervical Spinal Hemisection in Rats

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Intermittent phrenic afferent activation induces phrenic motor plasticity.

Nicole M Popp1, Taylor C Holmes1,2, Elizabeth A Rozycki1

  • 1Department of Physical Therapy, Marquette University, Milwaukee, Wisconsin, United States.

Journal of Neurophysiology
|April 20, 2026
PubMed
Summary
This summary is machine-generated.

Intermittent electrical stimulation of phrenic afferents induces phrenic motor plasticity (pAIP), enhancing breathing responses. This plasticity requires phrenic afferent activation and shows pattern sensitivity, crucial for developing new respiratory therapies.

Keywords:
afferentspAIPphrenicplasticityrespiratory control

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Area of Science:

  • Neuroscience
  • Respiratory Physiology
  • Rehabilitation Medicine

Background:

  • Electrical stimulation of the phrenic neuromuscular system aids breathing impairments.
  • Phrenic afferent-dependent plasticity is induced by diaphragm stimulation.
  • Understanding afferent-mediated plasticity is key for novel electrical stimulation therapies.

Purpose of the Study:

  • To test if intermittent activation of large-diameter phrenic afferents induces pattern-sensitive phrenic motor plasticity.
  • To investigate the role of phrenic afferents in this plasticity.
  • To examine the effect on hypercapnic response.

Main Methods:

  • Inspiratory-triggered electrical stimulation (narrow pulse width) to phrenic nerve in intermittent or sustained patterns.
  • Recording contralateral phrenic motor output post-stimulation.
  • Assessing plasticity with and without dorsal rhizotomy.

Main Results:

  • Intermittent, but not sustained, stimulation produced long-lasting increases in contralateral phrenic motor amplitude.
  • Plasticity was absent after dorsal rhizotomy, confirming the requirement for phrenic afferent activation.
  • Both stimulation patterns enhanced the hypercapnic response.

Conclusions:

  • Intermittent activation of large-diameter phrenic afferents induces phrenic afferent-induced plasticity (pAIP).
  • pAIP is pattern-sensitive and requires intact phrenic afferent input.
  • This finding advances understanding of respiratory motor plasticity and informs therapeutic strategies.