{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,13]],"date-time":"2026-07-13T07:56:18Z","timestamp":1783929378717,"version":"3.55.0"},"reference-count":37,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2006,3,7]],"date-time":"2006-03-07T00:00:00Z","timestamp":1141689600000},"content-version":"vor","delay-in-days":6,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Journal of Physiology"],"published-print":{"date-parts":[[2006,3]]},"abstract":"<jats:p>In locomotion, the flexor muscles of the leg are mainly concerned with the relatively constant task of raising the foot, whereas the extensors have the more variable task of support and propulsion at different speeds. This suggests that the way in which the fusimotor system works may differ between the two muscle groups. Observations previously made of the static and dynamic \u03b3\u2010motor firing patterns in the ankle extensor medial gastrocnemius (MG) have therefore been repeated in the flexor tibialis anterior (TA). One or more single \u03b3\u2010motor axons, dissected from a small filament of TA nerve, were recorded simultaneously with a number of single spindle afferents in dorsal rootlets. Cats were decerebrated and locomoted spontaneously on a treadmill. Identification of each \u03b3\u2010motor axon depended on relating the changes in firing caused by midbrain stimulation to the changes in static and dynamic behaviour of the spindle afferents in response to repetitive ramp and hold stretches. Static \u03b3 axons all showed a smooth modulation in frequency, increasing in phase with muscle shortening, superimposed on a minimum frequency of about 20\u201330 impulses s<jats:sup>\u22121<\/jats:sup>. Dynamic \u03b3 axons showed interrupted firing with the frequency rising abruptly from zero at the onset of shortening, and falling again to zero shortly after the onset of lengthening. The frequency during the active periods was relatively constant, even when movement amplitudes varied. The basic similarity in the static and dynamic gamma discharge patterns for the two muscles suggests that the strategy of \u03b3\u2010motor control is common to both flexors and extensors. The static \u03b3 pattern is thought to be a \u2018temporal template\u2019 of the expected movement, effectively expanding the dynamic response range of the spindles in active movements. The dynamic \u03b3 pattern sensitizes the primary afferents to detect the onset of muscle lengthening and to detect departures from the intended movement trajectory.<\/jats:p>","DOI":"10.1113\/jphysiol.2005.101634","type":"journal-article","created":{"date-parts":[[2006,1,20]],"date-time":"2006-01-20T01:23:25Z","timestamp":1137720205000},"page":"711-723","source":"Crossref","is-referenced-by-count":48,"title":["Static and dynamic \u03b3\u2010motor output to ankle flexor muscles during locomotion in the decerebrate cat"],"prefix":"10.1113","volume":"571","author":[{"given":"A.","family":"Taylor","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R.","family":"Durbaba","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P. 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