PMID: 7371627Feb 1, 1980Paper

Fast and slow motor units: their recruitment for tonic and phasic contraction in normal man

European Journal of Applied Physiology and Occupational Physiology
B Maton

Abstract

Most skeletal muscles include at least two types of MU's. Then, it has been stated that the properties of each MU may imply its specific recruitment in static or dynamic work. To test this hypothesis, the activities of biceps brachii MU's have been recorded during voluntary static contraction followed without any break by dynamic contraction. The MU's activity was recorded by means of wire-electrodes. From 45 tests carried out on 15 normal subjects in which 78 MU's were studied it has been found that: (1) the same MU may discharge both in static and in dynamic work; (2) in both types of work the MU's firing rate and recruitment only depend on the external force. For example, a single MU which does not discharge for a given level of static force will discharge during the following dynamic work, but can also be recruited for a higher level of static force. Thus, it can be said that the qualification "tonic" and "phasic", characterize the MU's twitches and do not imply any static-dynamic differentiation. A comparison has been made between the patterns of MU activity which occur in movement against load and those which have been found in movement against inertia. It is suggested that while the latter are preprogrammed, the former f...Continue Reading

References

Jun 1, 1975·Electroencephalography and Clinical Neurophysiology·B Maton, S Bouisset
Jan 1, 1977·Journal of Neurophysiology·D A Harris, E Henneman
Jun 21, 1976·European Journal of Applied Physiology and Occupational Physiology·B Maton
Nov 1, 1973·The Journal of Physiology·R E BurkeF E Zajac
Jan 1, 1972·Physiological Reviews·R I Close
Apr 1, 1973·The Journal of Physiology·H S Milner-BrownR Yemm
Feb 18, 1974·Pflügers Archiv : European journal of physiology·A Gydikov, D Kosarov
Aug 1, 1970·Acta Physiologica Scandinavica·F Buchthal, H Schmalbruch
Jun 1, 1968·The Journal of Physiology·R E Burke
May 1, 1965·Journal of Neurophysiology·E HENNEMAN, C B OLSON

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Citations

Jan 1, 1990·European Journal of Applied Physiology and Occupational Physiology·D GametF Goubel
Jul 27, 2005·Journal of Neurology·Philipp DiehlArmin Curt
Jan 1, 1987·European Journal of Applied Physiology and Occupational Physiology·S Le Bozec, B Maton
Jan 1, 1986·European Journal of Applied Physiology and Occupational Physiology·J DuchateauK Hainaut
Feb 1, 1986·Muscle & Nerve·L Edström, L Grimby
Jul 19, 2011·Brain Research·Jacques Duchateau, Roger M Enoka
Mar 1, 1984·Journal of Oral Rehabilitation·L V Christensen, S E Mohamed
Feb 1, 1981·American Journal of Community Psychology·J Rappaport

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