Variability of motor unit discharge and force fluctuations across a range of muscle forces in older adults

2005 ◽  
Vol 32 (4) ◽  
pp. 533-540 ◽  
Author(s):  
Brian L. Tracy ◽  
Katrina S. Maluf ◽  
Jennifer L. Stephenson ◽  
Sandra K. Hunter ◽  
Roger M. Enoka
Keyword(s):  
Older Adults ◽  
Motor Unit ◽  
Muscle Forces ◽  
Unit Discharge ◽  
Force Fluctuations ◽  
Motor Unit Discharge

Fluctuations in Isometric Force Are Associated With Motor Unit Discharge Rate Variability in Older Adults

2004 ◽  
Vol 36 (Supplement) ◽  
pp. S123 ◽  
Author(s):  
Jennifer L. Stephenson ◽  
Katrina S. Maluf ◽  
Brian L. Tracy ◽  
Sandra K. Hunter ◽  
Roger M. Enoka
Keyword(s):  
Older Adults ◽  
Motor Unit ◽  
Isometric Force ◽  
Discharge Rate ◽  
Unit Discharge ◽  
Motor Unit Discharge

Motor unit discharge behavior in older adults during maximal-effort contractions

1995 ◽  
Vol 79 (6) ◽  
pp. 1908-1913 ◽  
Author(s):  
G. Kamen ◽  
S. V. Sison ◽  
C. C. Du ◽  
C. Patten
Keyword(s):  
Older Adults ◽  
Motor Unit ◽  
Discharge Rate ◽  
Force Production ◽  
Motor Units ◽  
Older Individuals ◽  
Unit Discharge ◽  
Maximal Force ◽  
Motor Unit Discharge ◽  
Common Observation

A reduction in maximal force production is a common observation in older individuals. In an effort to determine whether aging is accompanied by reductions in central motoneuron drive limiting motor performance, motor unit discharge records were obtained from seven young (21–33 yr) and seven older (> 67 yr) adults. Informed consent was obtained from all subjects. The task required the subject to perform a maximal abduction of the second digit under isometric conditions. Motor unit potentials in the first dorsal interosseous were monitored by using a selective four-wire needle electrode and identified off-line with the aid of a Dantec electromyograph. The maximal discharge rate in the older adults (31.1 impulses/s) was significantly smaller (P < 0.05) than that in the younger subjects (50.9 impulses/s). These findings suggest that reductions in maximal force capability in older adults are partially due to an impaired ability to fully drive the surviving motor units.

Subthreshold electrical stimulation reduces motor unit discharge variability and decreases the force fluctuations of plantar flexion

2012 ◽  
Vol 513 (2) ◽  
pp. 146-150 ◽  
Author(s):  
Motoki Kouzaki ◽  
Tetsuya Kimura ◽  
Yasuhide Yoshitake ◽  
Tatsuya Hayashi ◽  
Toshio Moritani
Keyword(s):  
Electrical Stimulation ◽  
Motor Unit ◽  
Plantar Flexion ◽  
Unit Discharge ◽  
Force Fluctuations ◽  
Motor Unit Discharge

Adaptations in maximal motor unit discharge rate to strength training in young and older adults

2001 ◽  
Vol 24 (4) ◽  
pp. 542-550 ◽  
Author(s):  
Carolynn Patten ◽  
Gary Kamen ◽  
Daniel M. Rowland
Keyword(s):  
Older Adults ◽  
Strength Training ◽  
Motor Unit ◽  
Discharge Rate ◽  
Unit Discharge ◽  
Motor Unit Discharge
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