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To study changes in reflex pathways after a complete spinalization, we recorded spinal reflexes during locomotion before and after a complete transection of the spinal cord at the 13th thoracic segment in cats. We chronically implanted electrodes in three cats, to record electromyography (EMG) in several hindlimb muscles and around the left tibial (Tib) nerve at the ankle to elicit reflexes during locomotion before and after spinalization in the same cat. Control values of kinematics, EMGs and reflexes were obtained during intact locomotion for 33\u201360 days before spinalization. After spinalization, cats were trained 3\u20135 times a week on a motorized treadmill. Recordings resumed once a stable spinal locomotion was achieved (26\u201343 days), with consistent plantar foot placement and full hindquarter weight support without perineal stimulation. Changes in Tib nerve reflex responses after spinalization in the same cat during locomotion were found in all muscles studied and were often confined to specific phases of the step cycle. The most remarkable change was the appearance of short\u2010latency excitatory responses in some ipsilateral ankle extensors during stance. Short\u2010latency excitatory responses in the ipsilateral tibialis anterior were increased during stance, whereas in other flexors such as semitendinosus and sartorius, increases were mostly confined to swing. Longer\u2010latency excitatory responses in ipsilateral flexors were absent or reduced. Responses evoked in limb muscles contralateral to stimulation were generally increased throughout the step cycle. These reflex changes after spinalization provide important clues regarding the functional reorganization of reflex pathways during spinal locomotion.<\/jats:p>","DOI":"10.1113\/jphysiol.2008.152488","type":"journal-article","created":{"date-parts":[[2008,4,18]],"date-time":"2008-04-18T00:35:57Z","timestamp":1208478957000},"page":"2927-2945","source":"Crossref","is-referenced-by-count":80,"title":["Adaptive changes of the locomotor pattern and cutaneous reflexes during locomotion studied in the same cats before and after 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