scholarly journals Vibration-induced discharge patterns of single motor units in the masseter muscle in man.

1975 ◽  
Vol 253 (2) ◽  
pp. 429-442 ◽  
Author(s):  
J E Desmedt ◽  
E Godaux
Keyword(s):  
Masseter Muscle ◽  
Motor Units ◽  
Single Motor ◽  
Single Motor Units ◽  
Discharge Patterns

Modulation of stretch-evoked reflexes in single motor units in human masseter muscle by experimental pain

2000 ◽  
Vol 132 (1) ◽  
pp. 65-71 ◽  
Author(s):  
Peter Svensson ◽  
Timothy S. Miles ◽  
Thomas Graven-Nielsen ◽  
Lars Arendt-Nielsen
Keyword(s):  
Masseter Muscle ◽  
Experimental Pain ◽  
Motor Units ◽  
Single Motor ◽  
Single Motor Units

Recruitment and Discharge Patterns of Single Motor Units During Speech Production

1977 ◽  
Vol 20 (4) ◽  
pp. 613-630 ◽  
Author(s):  
Harvey M. Sussman ◽  
Peter F. MacNeilage ◽  
Randall K. Powers
Keyword(s):  
Dynamic Range ◽  
Isometric Force ◽  
Discharge Rate ◽  
Motor Units ◽  
Size Principle ◽  
Single Motor ◽  
Single Motor Units ◽  
Movement Dynamics ◽  
Discharge Patterns ◽  
Anterior Belly

Recruitment and discharge patterns of single motor units (MUs) in the anterior belly of digastric were studied during speech in three subjects, using electrodes facilitating selective recording at high force levels. Fixed recruitment order was observed in over 99% of all comparisons. Later recruited units invariably possessed muscle action potentials of higher amplitude, suggesting that units were activated in accordance with the “size principle.” Additional evidence for this was that later recruited units, of a set of three studied during speech, motor unit training, and isometric force ramps, showed greater sensitivity to input, and greater dynamic range than earlier recruited units. Units in this set were much more sensitive to rapid changes in input associated with speech gestures than to static activation even at high force levels. Several significant relations between discharge characteristics and aspects of movement dynamics were observed, including relations between (1) recruitment interval (MU1 to MU3) and latency of mandibular lowering, (2) onset of initial discharge of MU1 and relative mechanical advantage of the mandible, (3) number of MUs active and velocity and displacement of the mandible, and (4) discharge rate of MU3 and velocity and displacement of the mandible.

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