MMG-EMG cross spectrum and muscle fiber type

T. W. Beck, T. Housh, A. C. Fry, J. T. Cramer, J. Weir, B. Schilling, M. Falvo, C. Moore

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The purpose of this study was to investigate fiber type-related differences in the patterns of responses for mechanomyographic-electromyographic (MMG-EMG) cross spectrum mean power frequency (MPF) in resistance-trained and aerobically-trained subjects during a fatiguing muscle action. Five resistance-trained and five aerobically-trained men performed a 45-s isometric muscle action of the dominant leg extensors at 50 % MVC while MMG and EMG signals were recorded simultaneously from the vastus lateralis muscle. In addition, a biopsy was taken to determine the myosin heavy chain (MHC) isoform content of the vastus lateralis. The resistance-trained and aerobically-trained subjects demonstrated similar patterns of responses for MMG-EMG cross spectrum MPF during the sustained muscle action. The vastus lateralis of the resistance-trained subjects demonstrated primarily Type II MHC isoform expression, indicative of fast-twitch muscle fibers, while that of the aerobically-trained subjects was composed mostly of Type I MHC isoform expression, indicative of slow-twitch fibers. Thus, the differences in fiber type characteristics were not manifested in the patterns of responses for MMG-EMG cross spectrum MPF.

Original languageEnglish (US)
Pages (from-to)538-544
Number of pages7
JournalInternational Journal of Sports Medicine
Volume30
Issue number7
DOIs
StatePublished - Jan 1 2009

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Myosin Heavy Chains
Quadriceps Muscle
Muscles
Protein Isoforms
Fast-Twitch Muscle Fibers
Leg
Biopsy

Keywords

  • Cross spectrum
  • Electromyography
  • Mechanomyography
  • Muscle fiber type

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Beck, T. W., Housh, T., Fry, A. C., Cramer, J. T., Weir, J., Schilling, B., ... Moore, C. (2009). MMG-EMG cross spectrum and muscle fiber type. International Journal of Sports Medicine, 30(7), 538-544. https://doi.org/10.1055/s-0029-1202349

MMG-EMG cross spectrum and muscle fiber type. / Beck, T. W.; Housh, T.; Fry, A. C.; Cramer, J. T.; Weir, J.; Schilling, B.; Falvo, M.; Moore, C.

In: International Journal of Sports Medicine, Vol. 30, No. 7, 01.01.2009, p. 538-544.

Research output: Contribution to journalArticle

Beck, TW, Housh, T, Fry, AC, Cramer, JT, Weir, J, Schilling, B, Falvo, M & Moore, C 2009, 'MMG-EMG cross spectrum and muscle fiber type', International Journal of Sports Medicine, vol. 30, no. 7, pp. 538-544. https://doi.org/10.1055/s-0029-1202349
Beck, T. W. ; Housh, T. ; Fry, A. C. ; Cramer, J. T. ; Weir, J. ; Schilling, B. ; Falvo, M. ; Moore, C. / MMG-EMG cross spectrum and muscle fiber type. In: International Journal of Sports Medicine. 2009 ; Vol. 30, No. 7. pp. 538-544.
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