{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,10]],"date-time":"2026-02-10T19:50:14Z","timestamp":1770753014587,"version":"3.50.0"},"reference-count":45,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2005,11,24]],"date-time":"2005-11-24T00:00:00Z","timestamp":1132790400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Journal of Physiology"],"published-print":{"date-parts":[[2005,12]]},"abstract":"<jats:p>Proprioceptive information from paraspinal tissues including muscle contributes to neuromuscular control of the vertebral column. We investigated whether the history of a vertebra's position can affect signalling from paraspinal muscle spindles. Single unit recordings were obtained from muscle spindle afferents in the L<jats:sub>6<\/jats:sub> dorsal roots of 30 Nembutal\u2010anaesthetized cats. Each afferent's receptive field was in the intact muscles of the low back. The L<jats:sub>6<\/jats:sub> vertebra was controlled using a displacement\u2010controlled feedback motor and was held in each of three different conditioning positions for durations of 0, 2, 4, 6 and 8 s. Conditioning positions (1.0\u20132.2 mm dorsal and ventral relative to an intermediate position) were based upon the displacement that loaded the L<jats:sub>6<\/jats:sub> vertebra to 50\u201360% of the cat's body weight. Following conditioning positions that stretched (hold\u2010long) and shortened (hold\u2010short) the spindle, the vertebra was repositioned identically and muscle spindle discharge at rest and to movement was compared with conditioning at the intermediate position. Hold\u2010short conditioning augmented mean resting spindle discharge by +4.1 to +6.2 impulses s<jats:sup>\u22121<\/jats:sup>; however, the duration of hold\u2010short did not significantly affect this increase (<jats:italic>F<\/jats:italic><jats:sub>4,145<\/jats:sub>= 0.49, <jats:italic>P<\/jats:italic>= 0.74). The increase was maintained at the beginning of vertebral movement but quickly returned to baseline. Conversely, hold\u2010long conditioning significantly diminished mean resting spindle discharge by \u22122.0 to \u221216.1 impulses s<jats:sup>\u22121<\/jats:sup> (<jats:italic>F<\/jats:italic><jats:sub>4,145<\/jats:sub>= 11.23, <jats:italic>P<\/jats:italic> &lt; 0.001). The relationship between conditioning duration and the diminished resting discharge could be described by a quadratic (<jats:italic>F<\/jats:italic><jats:sub>1,145<\/jats:sub>= 9.28, <jats:italic>P<\/jats:italic>= 0.003) revealing that the effects of positioning history were fully developed within 2 s of conditioning. In addition, 2 s or greater of hold\u2010long conditioning significantly diminished spindle discharge to vertebral movement by \u22125.7 to \u221210.0 impulses s<jats:sup>\u22121<\/jats:sup> (<jats:italic>F<\/jats:italic><jats:sub>4,145<\/jats:sub>= 11.0, <jats:italic>P<\/jats:italic> &lt; 0.001). These effects of vertebral positioning history may be a mechanism whereby spinal biomechanics interacts with the spine's proprioceptive system to produce acute effects on neuromuscular control of the vertebral column.<\/jats:p>","DOI":"10.1113\/jphysiol.2005.095281","type":"journal-article","created":{"date-parts":[[2005,10,7]],"date-time":"2005-10-07T00:24:07Z","timestamp":1128644647000},"page":"655-665","source":"Crossref","is-referenced-by-count":26,"title":["Vertebral position alters paraspinal muscle spindle responsiveness in the feline spine: effect of positioning duration"],"prefix":"10.1113","volume":"569","author":[{"given":"Weiqing","family":"Ge","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cynthia R.","family":"Long","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joel 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