caa a22 4500 44535030X CHVBK 20180317142841.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00221-011-2801-1 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2801-1 The tetanic depression in fast motor units of mammalian skeletal muscle can be evoked by lengthening of one initial interpulse interval [Elektronische Daten] [J. Celichowski, Z. Dobrzyńska, D. Łochyński, P. Krutki] A lower than expected tetanic force (the tetanic depression) is regularly observed in fast motor units (MUs) when a higher stimulation frequency immediately follows a lower one. The aim of the present study was to determine whether prolongation of only the first interpulse interval (IPI) resulted in tetanic depression. The experiments were carried out on fast MUs of the medial gastrocnemius muscle in cats and rats. The tetanic depression was measured in each case as the force decrease of a tetanus with one IPI prolonged in relation to the tetanic force at the respective constant stimulation frequency. Force depression was observed in all cases studied and was considerably greater in cats. For cats, the mean values of force depression amounted to 28.64% for FR and 10.86% for FF MUs whereas for rats 9.30 and 7.21% for FR and FF motor units, respectively. Since the phenomenon of tetanic depression in mammalian muscle is commonly observed even after a change in only the initial interpulse interval within a stimulation pattern, it can effectively influence processes of force regulation during voluntary activity of a muscle, when motoneurones progressively increase the firing rate. The Author(s), 2011 Tetanic depression nationallicence Motor units nationallicence Medial gastrocnemius nationallicence Rat nationallicence Cat nationallicence Interpulse interval nationallicence Celichowski J. Department of Neurobiology, University School of Physical Education, 55 Grunwaldzka St., 60-352, Poznan, Poland aut Dobrzyńska Z. Department of Neurobiology, University School of Physical Education, 55 Grunwaldzka St., 60-352, Poznan, Poland aut Łochyński D. Department of Neurobiology, University School of Physical Education, 55 Grunwaldzka St., 60-352, Poznan, Poland aut Krutki P. Department of Neurobiology, University School of Physical Education, 55 Grunwaldzka St., 60-352, Poznan, Poland aut Experimental Brain Research Springer-Verlag 214/1(2011-09-01), 19-26 0014-4819 214:1<19 2011 214 221 https://doi.org/10.1007/s00221-011-2801-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2801-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Celichowski J. Department of Neurobiology, University School of Physical Education, 55 Grunwaldzka St., 60-352, Poznan, Poland aut NATIONALLICENCE 700 1- Dobrzyńska Z. Department of Neurobiology, University School of Physical Education, 55 Grunwaldzka St., 60-352, Poznan, Poland aut NATIONALLICENCE 700 1- Łochyński D. Department of Neurobiology, University School of Physical Education, 55 Grunwaldzka St., 60-352, Poznan, Poland aut NATIONALLICENCE 700 1- Krutki P. Department of Neurobiology, University School of Physical Education, 55 Grunwaldzka St., 60-352, Poznan, Poland aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 214/1(2011-09-01), 19-26 0014-4819 214:1<19 2011 214 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer