{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T23:57:04Z","timestamp":1789171024428,"version":"build-2803163510"},"reference-count":120,"publisher":"Wiley","issue":"20","license":[{"start":{"date-parts":[[2020,8,13]],"date-time":"2020-08-13T00:00:00Z","timestamp":1597276800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100000065","name":"National Institute of Neurological Disorders and Stroke","doi-asserted-by":"publisher","award":["RO1 NS083666"],"award-info":[{"award-number":["RO1 NS083666"]}],"id":[{"id":"10.13039\/100000065","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100005191","name":"Craig H. 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While increased H\u2010reflex excitability in spastic individuals indicates a possible decrease in presynaptic inhibition, it remains unclear whether a decrease in sensory\u2010evoked PAD contributes to this effect.<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                          <jats:p>We investigated whether the PAD evoked by hindlimb afferents contributes to the change in presynaptic inhibition of the H\u2010reflex in a decerebrated rat preparation. We found that chronic SCI decreases presynaptic inhibition of the plantar H\u2010reflex through a reduction in PAD evoked by posterior biceps\u2010semitendinosus (PBSt) muscle group I afferents.<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                          <jats:p>We further found that step\u2010training restored presynaptic inhibition of the plantar H\u2010reflex evoked by PBSt, suggesting the presence of activity\u2010dependent plasticity of PAD pathways activated by flexor muscle group I afferents.<\/jats:p>\n                        <\/jats:list-item>\n                      <\/jats:list>\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Abstract<\/jats:title>\n                    <jats:p>Spinal cord injury (SCI) results in the disruption of supraspinal control of spinal networks and an increase in the relative influence of afferent feedback to sublesional neural networks, both of which contribute to enhancing spinal reflex excitability. Hyperreflexia occurs in \u223c75% of individuals with a chronic SCI and critically hinders functional recovery and quality of life. It is suggested that it results from an increase in motoneuronal excitability and a decrease in presynaptic and postsynaptic inhibitory mechanisms. In contrast, locomotor training decreases hyperreflexia by restoring presynaptic inhibition. Primary afferent depolarization (PAD) is a powerful presynaptic inhibitory mechanism that selectively gates primary afferent transmission to spinal neurons to adjust reflex excitability and ensure smooth movement. However, the effect of chronic SCI and step\u2010training on the reorganization of presynaptic inhibition evoked by hindlimb afferents, and the contribution of PAD has never been demonstrated. The objective of this study is to directly measure changes in presynaptic inhibition through dorsal root potentials (DRPs) and its association with plantar H\u2010reflex inhibition. We provide direct evidence that H\u2010reflex hyperexcitability is associated with a decrease in transmission of PAD pathways activated by posterior biceps\u2010semitendinosus (PBSt) afferents after chronic SCI. More precisely, we illustrate that the pattern of inhibition evoked by PBSt group I muscle afferents onto both L4\u2010DRPs and plantar H\u2010reflexes evoked by the distal tibial nerve is impaired after chronic SCI. These changes are not observed in step\u2010trained animals, suggesting a role for activity\u2010dependent plasticity to regulate PAD pathways activated by flexor muscle group I afferents.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1113\/jp280070","type":"journal-article","created":{"date-parts":[[2020,7,28]],"date-time":"2020-07-28T12:55:36Z","timestamp":1595940936000},"page":"4621-4642","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":41,"title":["Direct evidence for decreased presynaptic inhibition evoked by PBSt group I muscle afferents after chronic SCI and recovery with step\u2010training in rats"],"prefix":"10.1113","volume":"598","author":[{"given":"Guillaume","family":"Caron","sequence":"first","affiliation":[{"name":"Marion Murray Spinal Cord Research Center Department of Neurobiology and Anatomy Drexel University  Philadelphia PA 19129"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jadwiga 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