The relationships among peak torgue, mean power output, mechanomyography, and electromyography in men and women during maximal, accentric isokinetic muscle actions

Joel T Cramer, Terry J. Housh, Tammy K. Evetovich, Glen O. Johnson, Kyle T. Ebersole, Sharon R. Perry, Anthony J. Bull

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The purpose of the present investigation was to examine the velocity-related patterns of peak torque (PT), mean power output (MP), mechanomyographic (MMG) amplitude, and electromyographic (EMG) amplitude of the vastus lateralis (VL) muscle in men and women during maximal, eccentric isokinetic muscle actions of the leg extensors. Eight women [mean (SD)] [aged 23 (3) years] and seven men [aged 23 (2) years] volunteered for this investigation. Their PT was measured on a calibrated dynamometer at randomly ordered velocities of 30, 90, and 150°·s-1. A piezoelectric MMG recording sensor was placed between bipolar surface EMG electrodes (Ag-AgCl) over the VL muscle. Their MP was determined using the dynamometer software. The results indicated no sex-related differences (P > 0.05) for the patterns of PT, MP, MMG amplitude, or EMG amplitude across velocity. The normalized values for MP and MMG amplitude increased (P < 0.05) from 30 to 150°·s-1 (30°·s-1 < 90°·s-1 < 150°·s-1), while PT and EMG amplitudes remained unchanged across velocity. The results indicated close associations between the velocity-related patterns of MP and MMG amplitudes as well as PT and EMG amplitudes. Thus, MMG amplitude reflected the velocity-related changes in muscle power output, but not torque production, while EMG amplitude reflected torque production, but not muscle power output. During maximal, eccentric isokinetic muscle actions, EMG and MMG signals provided unique information regarding the electrical and mechanical aspects of muscle strength and power.

Original languageEnglish (US)
Pages (from-to)226-232
Number of pages7
JournalEuropean Journal of Applied Physiology
Volume86
Issue number3
DOIs
StatePublished - Dec 1 2002

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Torque
Electromyography
Muscles
Quadriceps Muscle
Muscle Strength
Sex Characteristics
Leg
Electrodes
Software

Keywords

  • Electromyography
  • Mechanomyography
  • Muscle power
  • Muscle strength

ASJC Scopus subject areas

  • Physiology
  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

The relationships among peak torgue, mean power output, mechanomyography, and electromyography in men and women during maximal, accentric isokinetic muscle actions. / Cramer, Joel T; Housh, Terry J.; Evetovich, Tammy K.; Johnson, Glen O.; Ebersole, Kyle T.; Perry, Sharon R.; Bull, Anthony J.

In: European Journal of Applied Physiology, Vol. 86, No. 3, 01.12.2002, p. 226-232.

Research output: Contribution to journalArticle

Cramer, Joel T ; Housh, Terry J. ; Evetovich, Tammy K. ; Johnson, Glen O. ; Ebersole, Kyle T. ; Perry, Sharon R. ; Bull, Anthony J. / The relationships among peak torgue, mean power output, mechanomyography, and electromyography in men and women during maximal, accentric isokinetic muscle actions. In: European Journal of Applied Physiology. 2002 ; Vol. 86, No. 3. pp. 226-232.
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