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. 1990 Apr;53(4):331–334. doi: 10.1136/jnnp.53.4.331

Relationship between electrical and mechanical properties of motor units.

T Vogt 1, W A Nix 1, B Pfeifer 1
PMCID: PMC1014172  PMID: 2341847

Abstract

In six healthy volunteers, the size of the motor unit action potential (MUAP) was related to its contractile behaviour. Electrical activity was determined by measuring amplitude and area of the potential, using the macro electromyography (EMG) technique. The mechanical response was characterised by contraction time, twitch force and relaxation time, recorded with the spike triggered averaging technique. With increasing tension of the whole muscle corresponding to an increasing threshold, the force of single units enlarged exponentially compared to their EMG. There was only a weak relationship between contraction time and electrical activity and none between EMG and relaxation time.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Andreassen S., Bar-On E. Estimation of motor unit twitches. IEEE Trans Biomed Eng. 1983 Nov;30(11):742–748. doi: 10.1109/tbme.1983.325189. [DOI] [PubMed] [Google Scholar]
  2. BIGLAND B., LIPPOLD O. C. The relation between force, velocity and integrated electrical activity in human muscles. J Physiol. 1954 Jan;123(1):214–224. doi: 10.1113/jphysiol.1954.sp005044. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Butler B. P., Ball R. D., Albers J. W. Effect of electrode type and position on motor unit action potential configuration. Muscle Nerve. 1982;5(9S):S95–S97. [PubMed] [Google Scholar]
  4. Calancie B., Bawa P. Limitations of the spike-triggered averaging technique. Muscle Nerve. 1986 Jan;9(1):78–83. doi: 10.1002/mus.880090113. [DOI] [PubMed] [Google Scholar]
  5. Dengler R., Stein R. B., Thomas C. K. Axonal conduction velocity and force of single human motor units. Muscle Nerve. 1988 Feb;11(2):136–145. doi: 10.1002/mus.880110209. [DOI] [PubMed] [Google Scholar]
  6. Freund H. J. Motor unit and muscle activity in voluntary motor control. Physiol Rev. 1983 Apr;63(2):387–436. doi: 10.1152/physrev.1983.63.2.387. [DOI] [PubMed] [Google Scholar]
  7. HENNEMAN E., OLSON C. B. RELATIONS BETWEEN STRUCTURE AND FUNCTION IN THE DESIGN OF SKELETAL MUSCLES. J Neurophysiol. 1965 May;28:581–598. doi: 10.1152/jn.1965.28.3.581. [DOI] [PubMed] [Google Scholar]
  8. Herdmann J., Büdingen H. J., Reiners K., Berger W., Freund H. J. Die Abhängigkeit der Aktionspotentialamplitude motorischer Einheiten von der Rekrutierungsschwelle: Implikationen für die Elektromyographie. EEG EMG Z Elektroenzephalogr Elektromyogr Verwandte Geb. 1986 Sep;17(3):140–146. [PubMed] [Google Scholar]
  9. Lawrence J. H., De Luca C. J. Myoelectric signal versus force relationship in different human muscles. J Appl Physiol Respir Environ Exerc Physiol. 1983 Jun;54(6):1653–1659. doi: 10.1152/jappl.1983.54.6.1653. [DOI] [PubMed] [Google Scholar]
  10. Milner-Brown H. S., Stein R. B. The relation between the surface electromyogram and muscular force. J Physiol. 1975 Apr;246(3):549–569. doi: 10.1113/jphysiol.1975.sp010904. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Milner-Brown H. S., Stein R. B., Yemm R. The contractile properties of human motor units during voluntary isometric contractions. J Physiol. 1973 Jan;228(2):285–306. doi: 10.1113/jphysiol.1973.sp010087. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Milner-Brown H. S., Stein R. B., Yemm R. The orderly recruitment of human motor units during voluntary isometric contractions. J Physiol. 1973 Apr;230(2):359–370. doi: 10.1113/jphysiol.1973.sp010192. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Monster A. W., Chan H. Isometric force production by motor units of extensor digitorum communis muscle in man. J Neurophysiol. 1977 Nov;40(6):1432–1443. doi: 10.1152/jn.1977.40.6.1432. [DOI] [PubMed] [Google Scholar]
  14. Pfeifer B., Nix W. A., Vogt T. Makro-EMG: Methodik und Probleme der Normwerterstellung am Beispiel des M. extensor digitorum communis. EEG EMG Z Elektroenzephalogr Elektromyogr Verwandte Geb. 1988 Sep;19(3):165–171. [PubMed] [Google Scholar]
  15. Stein R. B., French A. S., Mannard A., Yemm R. New methods for analysing motor function in man and animals. Brain Res. 1972 May 12;40(1):187–192. doi: 10.1016/0006-8993(72)90126-6. [DOI] [PubMed] [Google Scholar]
  16. Stephens J. A., Usherwood T. P. The mechanical properties of human motor units with special reference to their fatiguability and recruitment threshold. Brain Res. 1977 Apr 8;125(1):91–97. doi: 10.1016/0006-8993(77)90361-4. [DOI] [PubMed] [Google Scholar]
  17. Stålberg E. Macro EMG, a new recording technique. J Neurol Neurosurg Psychiatry. 1980 Jun;43(6):475–482. doi: 10.1136/jnnp.43.6.475. [DOI] [PMC free article] [PubMed] [Google Scholar]
  18. Stålberg E. New EMG methods to study the motor unit. Electroencephalogr Clin Neurophysiol Suppl. 1987;39:38–49. [PubMed] [Google Scholar]
  19. Stålberg E., Thiele B. Motor unit fibre density in the extensor digitorum communis muscle. Single fibre electromyographic study in normal subjects at different ages. J Neurol Neurosurg Psychiatry. 1975 Sep;38(9):874–880. doi: 10.1136/jnnp.38.9.874. [DOI] [PMC free article] [PubMed] [Google Scholar]

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