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STUDIES ON SYNTONIZATION“VOLTAGE IN THE ELECTROMYOGRAM. (1) CHARACTERISTICS OF”SYNTONIZATION“VOLTAGE
Author(s) -
Yoshii Naossburo,
Saito Ichiro
Publication year - 1956
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1111/j.1440-1819.1956.tb02731.x
Subject(s) - voltage , chemistry , interval (graph theory) , standard deviation , series (stratigraphy) , physics , anatomy , mathematics , combinatorics , statistics , geology , quantum mechanics , biology , paleontology
Summary The authors have analyzed the intervals and the standard deviations of characteristic double‐spikes appearing in the EMGs led from the bindlimb muscles such as the gastrocnemius of normal dogs, of anterior‐ or lateral‐funicle‐sectioned dogs as well as normal rabbits, and it is ascertained that the double‐spikes obtained are neither the “crossing‐away” discharges of two distinct NMUs, nor the double discharges of one and the same NMU, nor “doublets” as reported by Landau , and that this is evidently due to two NMUs discharging in certain correlation to each other. This pattern is named syntonization, and its characteristic, different from those of other apparently similar double spikes, are:1 The syntonization voltage consists of two single‐spikes of two distinct NMUs, and it can be seen that a long record consists of two parts, namely, the one part in which syntonized spikes appear in succession (designated as “S” in Fig. 1B) and the other in which two series of single spikes, “p” and “q” appear alternately (“PQ” in Fig. 1E). The apparent spike interval (m) in the latter case is about half as much as that of the former. 2 In the part of successive single spikes (“ PQ”), the ratto of average interval (m) to standard deviation ( a ), i. e. the s̀/ m value is greater than in normal NMU‐discharges. On the contrary, if these spikes are regarded as produced by alternate dischargz of two distinct NMUs (p and q) and the rzspective s̀/m values are calculated of p‐ and q‐series, both of these valus approximate to s̀/m value at that part of syntonized spikes. 3 Syntonization voltages appear at an interval of between 100 and 170 milliseconds (in the gastrocnemius muscles of dogs and rabbits). 4 When the passive muscle stretch is exerted appropriately weakened, spike discharges become syntonized (EMG record “S”), and when it is intensified, each component of the double‐spikes are separated from each other (EMG record “PQ”). 5 Simultaneous recording through two electrodes from adj acent two points in a muscle may show the syntonization pattern of two NMUs from one lead and a train of single spikes of one NMU participating in the production of the syntonization, coincidently appearing with the syntonization voltages, from the other.