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

G. Kamen, S. V. Sison, C. C.D. Du, Carolynn Patten

Research output: Contribution to journalArticle

219 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1908-1913
Number of pages6
JournalJournal of Applied Physiology
Volume79
Issue number6
DOIs
StatePublished - Jan 1 1995
Externally publishedYes

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Motor Neurons
Informed Consent
Needles
Electrodes
Observation

Keywords

  • aging
  • human
  • motoneuron
  • muscle

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Motor unit discharge behavior in older adults during maximal-effort contractions. / Kamen, G.; Sison, S. V.; Du, C. C.D.; Patten, Carolynn.

In: Journal of Applied Physiology, Vol. 79, No. 6, 01.01.1995, p. 1908-1913.

Research output: Contribution to journalArticle

Kamen, G. ; Sison, S. V. ; Du, C. C.D. ; Patten, Carolynn. / Motor unit discharge behavior in older adults during maximal-effort contractions. In: Journal of Applied Physiology. 1995 ; Vol. 79, No. 6. pp. 1908-1913.
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