scholarly journals Changes in firing rate of human motor units during linearly changing voluntary contractions

1973 ◽  
Vol 230 (2) ◽  
pp. 371-390 ◽  
Author(s):  
H. S. Milner-Brown ◽  
R. B. Stein ◽  
R. Yemm
Keyword(s):  
Firing Rate ◽  
Motor Units ◽  
Human Motor ◽  
Voluntary Contractions ◽  
Human Motor Units

Properties of human motor units after prolonged activity at a constant firing rate

2003 ◽  
Vol 154 (4) ◽  
pp. 479-487 ◽  
Author(s):  
K. V. B. Johnson ◽  
S. C. Edwards ◽  
C. Van Tongeren ◽  
P. Bawa
Keyword(s):  
Firing Rate ◽  
Motor Units ◽  
Human Motor ◽  
Human Motor Units

scholarly journals Effects of joint immobilization on firing rate modulation of human motor units

2001 ◽  
Vol 530 (3) ◽  
pp. 507-519 ◽  
Author(s):  
Kazuhiko Seki ◽  
Yuko Taniguchi ◽  
Mitsuo Narusawa
Keyword(s):  
Firing Rate ◽  
Motor Units ◽  
Rate Modulation ◽  
Human Motor ◽  
Human Motor Units

scholarly journals Control scheme governing concurrently active human motor units during voluntary contractions

1982 ◽  
Vol 329 (1) ◽  
pp. 129-142 ◽  
Author(s):  
C. J. de Luca ◽  
R. S. LeFever ◽  
M. P. McCue ◽  
A. P. Xenakis
Keyword(s):  
Motor Units ◽  
Control Scheme ◽  
Human Motor ◽  
Voluntary Contractions ◽  
Human Motor Units

Discharge patterns in human motor units during fatiguing arm movements

1998 ◽  
Vol 85 (5) ◽  
pp. 1684-1692 ◽  
Author(s):  
L. Griffin ◽  
S. J. Garland ◽  
T. Ivanova
Keyword(s):  
Voluntary Movement ◽  
Motor Units ◽  
Constant Load ◽  
Short Isis ◽  
Interspike Intervals ◽  
Triceps Brachii ◽  
Movement Initiation ◽  
Human Motor ◽  
Discharge Patterns ◽  
Human Motor Units

The purpose of this study was to determine whether short interspike intervals (ISIs of <20 ms) would occur naturally during voluntary movement and would increase in number with fatigue. Thirty-four triceps brachii motor units from nine subjects were assessed during a fatigue task consisting of fifty extension and fifty flexion elbow movements against a constant-load opposing extension. Nineteen motor units were recorded from the beginning of the fatigue task; the number of short ISIs was 7.1 ± 4.1% of the total number of ISIs in the first one-third of the task (unfatigued state). This value increased to 11.8 ± 5.9% for the last one-third of the task (fatigued state). Fifteen motor units were recruited during the fatigue task and discharged, with 16.4 ± 6.0% of short ISIs in the fatigued state. For all motor units, the number of short ISIs was positively correlated ( r 2 = 0.85) with the recruitment threshold torque. Short ISIs occurred most frequently at movement initiation but also occurred throughout the movement. These results document the presence of short ISIs during voluntary movement and their increase in number during fatigue.

scholarly journals Non-invasive imaging of single human motor units

2020 ◽  
Vol 131 (6) ◽  
pp. 1399-1406 ◽  
Author(s):  
Matthew G. Birkbeck ◽  
Linda Heskamp ◽  
Ian S. Schofield ◽  
Andrew M. Blamire ◽  
Roger G. Whittaker
Keyword(s):  
Motor Units ◽  
Non Invasive ◽  
Human Motor ◽  
Human Motor Units
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