The 'initial burst' of human primary muscle spindle afferents has at least two components.

@article{citeulike:437025, abstract = {Ten muscle spindle primary afferents from the extensor digitorum communis muscle of man were studied with single unit afferent recordings. Responses to slow test stretches with three different pre-history conditions were assessed to investigate the contribution of rapid stretches to the stretch sensitization phenomenon. In two of the conditions, the slow test ramps were preceded by rapid stretch after which the parent muscle of the receptor was either (a) kept short for 5 seconds or (b) kept long for 3.2 seconds and then returned to the short muscle length for 5 seconds. The third condition (c) consisted of a slow stretch from short to long muscle length followed by a rapid return to the short muscle length, in turn followed by 5 seconds at the short muscle length. Afferent responses were depressed when the muscle had been kept at the long length after the rapid stretches (condition b) and enhanced when the muscle had been kept at the short length (conditions a \& c). A prominent 'initial burst' was only present in the afferent discharge when the parent muscles of the primary endings had been kept short (condition a). A second, more prolonged burst was present for conditions (a) and (c) but was lacking or inconspicuous when the muscle had been kept long after rapid stretches (condition b). The rapid stretches in the stretch sensitization paradigm appear to be a primary factor not only for the enhanced responses of sensitized primary afferents but also for the depressed responses of desensitized primary afferents.}, address = {Department of Physiology, University of Ume\r{a}, Sweden.}, author = {Edin, B. B. }, citeulike-article-id = {437025}, issn = {0001-6772}, journal = {Acta Physiol Scand}, month = {October}, number = {2}, pages = {169--175}, posted-at = {2005-12-13 16:58:30}, priority = {2}, title = {The 'initial burst' of human primary muscle spindle afferents has at least two components.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/1962523}, volume = {143}, year = {1991} }

TY - JOUR ID - citeulike:437025 L3 - citeulike-article-id:437025 N2 - Ten muscle spindle primary afferents from the extensor digitorum communis muscle of man were studied with single unit afferent recordings. Responses to slow test stretches with three different pre-history conditions were assessed to investigate the contribution of rapid stretches to the stretch sensitization phenomenon. In two of the conditions, the slow test ramps were preceded by rapid stretch after which the parent muscle of the receptor was either (a) kept short for 5 seconds or (b) kept long for 3.2 seconds and then returned to the short muscle length for 5 seconds. The third condition (c) consisted of a slow stretch from short to long muscle length followed by a rapid return to the short muscle length, in turn followed by 5 seconds at the short muscle length. Afferent responses were depressed when the muscle had been kept at the long length after the rapid stretches (condition b) and enhanced when the muscle had been kept at the short length (conditions a & c). A prominent 'initial burst' was only present in the afferent discharge when the parent muscles of the primary endings had been kept short (condition a). A second, more prolonged burst was present for conditions (a) and (c) but was lacking or inconspicuous when the muscle had been kept long after rapid stretches (condition b). The rapid stretches in the stretch sensitization paradigm appear to be a primary factor not only for the enhanced responses of sensitized primary afferents but also for the depressed responses of desensitized primary afferents. IS - 2 JF - Acta Physiol Scand SN - 0001-6772 AD - Department of Physiology, University of Umeå, Sweden. EP - 175 TI - The 'initial burst' of human primary muscle spindle afferents has at least two components. VL - 143 SP - 169 AU - Edin, BB PY - 1991/10// UR - http://view.ncbi.nlm.nih.gov/pubmed/1962523 ER -