The relationship of agonist muscle single motor unit firing rates and elbow extension limb movement kinematics

2021 ◽  
Author(s):  
Eric A. Kirk ◽  
Charles L. Rice
Keyword(s):  
Motor Unit ◽  
Limb Movement ◽  
Elbow Extension ◽  
Movement Kinematics ◽  
Single Motor Unit ◽  
Firing Rates ◽  
Single Motor ◽  
Motor Unit Firing ◽  
Relationship Of ◽  
The Relationship

Anconeus motor unit firing rates during isometric and muscle-shortening contractions comparing young and very old adults

2021 ◽  
Vol 126 (4) ◽  
pp. 1122-1136
Author(s):  
Eric A. Kirk ◽  
Kevin J. Gilmore ◽  
Charles L. Rice
Keyword(s):  
Motor Unit ◽  
Elbow Extension ◽  
Neural Drive ◽  
Younger Adults ◽  
Old Adults ◽  
Firing Rates ◽  
Motor Unit Firing ◽  
Muscle Shortening ◽  
Adult Aging ◽  
Shortening Contractions

Changes of neural drive to the muscle with adult aging, measured as motor unit firing rates during limb movements, are unknown. Throughout maximal voluntary efforts we found that, in comparison with young adults, firing rates were lower during isometric contraction in older adults but not different during elbow extension movements. Despite the older group being ∼33% weaker across contractions, their muscles can receive neural drive during movements that are similar to that of younger adults.

scholarly journals MEASUREMENT OF SINGLE MOTOR UNIT FIRING RATE BY ARRAYED SURFACE ELECTRODE

Biomechanisms ◽  
1986 ◽  
Vol 8 (0) ◽  
pp. 99-107 ◽  
Author(s):  
Kenzo AKAZAWA ◽  
Kazushi MATSUNOKI ◽  
Katsuhiko FUJII ◽  
Masaki YOSHIDA
Keyword(s):  
Firing Rate ◽  
Motor Unit ◽  
Surface Electrode ◽  
Single Motor Unit ◽  
Single Motor ◽  
Motor Unit Firing

S53: Single motor unit firing changes in VEMPs

2014 ◽  
Vol 125 ◽  
pp. S11-S12
Author(s):  
S. Rosengren ◽  
K.P. Weber
Keyword(s):  
Motor Unit ◽  
Single Motor Unit ◽  
Single Motor ◽  
Motor Unit Firing

scholarly journals The Relationship Between Blood Flow and Motor Unit Firing Rates in Response to Fatiguing Exercise Post-stroke

2019 ◽  
Vol 10 ◽  
Author(s):  
Spencer Murphy ◽  
Matthew Durand ◽  
Francesco Negro ◽  
Dario Farina ◽  
Sandra Hunter ◽  
...  
Keyword(s):  
Blood Flow ◽  
Motor Unit ◽  
Firing Rates ◽  
Post Stroke ◽  
Motor Unit Firing ◽  
Fatiguing Exercise ◽  
The Relationship

Single motor unit and fiber action potentials during fatigue

1985 ◽  
Vol 58 (4) ◽  
pp. 1073-1079 ◽  
Author(s):  
T. G. Sandercock ◽  
J. A. Faulkner ◽  
J. W. Albers ◽  
P. H. Abbrecht
Keyword(s):  
Muscle Fatigue ◽  
Motor Unit ◽  
High Frequency ◽  
Action Potentials ◽  
Low Frequency ◽  
Motor Units ◽  
Tension Development ◽  
Single Motor Unit ◽  
Single Motor ◽  
The Relationship

Muscle fatigue is defined as a loss of tension development during constant stimulation. Although the relationship is not well documented, muscle fatigue has been inferred from electromyogram (EMG) signals. The purpose of this study was to determine the relationship between the amplitude and duration of single motor unit action potentials (MUAPs) and the loss of tension development (fatigue) in the medial gastrocnemius muscles of cats. Single motor units were fatigued by continuous stimulation at 10 or 80 Hz or with trains of 40-Hz stimuli. When motor units were stimulated at 10 Hz and with trains at 40 Hz (low frequency), tension declined and remained depressed during recovery. The changes in the MUAP correlated poorly with changes in tension. During and after stimulation at 80 Hz (high frequency), changes in the amplitude and duration of MUAPs correlated highly with changes in tension development. Since the EMG signal is dependent on a summation and cancellation of individual MUAPs, the EMG provides a reasonable estimate of high-frequency fatigue but an unreliable measure of low-frequency fatigue.

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