Evaluating skeletal muscle electromechanical delay with intramuscular pressure

Shanette A. Go, William J Litchy, Loribeth Q. Evertz, Kenton R Kaufman

Research output: Contribution to journalArticle

Abstract

Introduction: Intramuscular pressure (IMP) is the fluid pressure generated within skeletal muscle and directly reflects individual muscle tension. The purpose of this study was to assess the development of force, IMP, and electromyography (EMG) in the tibialis anterior (TA) muscle during ramped isometric contractions and evaluate electromechanical delay (EMD). Methods: Force, EMG, and IMP were simultaneously measured during ramped isometric contractions in eight young, healthy human subjects. The EMD between the onset of force and EMG activity (Δt-EMG force) and the onset of IMP and EMG activity (Δt EMG-IMP) were calculated. Results: A statistically significant difference (p < 0.05) was found between the mean force-EMG EMD (36 ± 31 ms) and the mean IMP-EMG EMD (3 ± 21 ms). Conclusions: IMP reflects changes in muscle tension due to the contractile muscle elements.

Original languageEnglish (US)
JournalJournal of Biomechanics
DOIs
StateAccepted/In press - Jan 1 2018

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Electromyography
Muscle
Skeletal Muscle
Pressure
Muscle Tonus
Isometric Contraction
Muscles
Healthy Volunteers
Fluids

Keywords

  • Electromechanical delay
  • Intramuscular pressure
  • Muscle

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Biomedical Engineering
  • Rehabilitation

Cite this

Evaluating skeletal muscle electromechanical delay with intramuscular pressure. / Go, Shanette A.; Litchy, William J; Evertz, Loribeth Q.; Kaufman, Kenton R.

In: Journal of Biomechanics, 01.01.2018.

Research output: Contribution to journalArticle

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N2 - Introduction: Intramuscular pressure (IMP) is the fluid pressure generated within skeletal muscle and directly reflects individual muscle tension. The purpose of this study was to assess the development of force, IMP, and electromyography (EMG) in the tibialis anterior (TA) muscle during ramped isometric contractions and evaluate electromechanical delay (EMD). Methods: Force, EMG, and IMP were simultaneously measured during ramped isometric contractions in eight young, healthy human subjects. The EMD between the onset of force and EMG activity (Δt-EMG force) and the onset of IMP and EMG activity (Δt EMG-IMP) were calculated. Results: A statistically significant difference (p < 0.05) was found between the mean force-EMG EMD (36 ± 31 ms) and the mean IMP-EMG EMD (3 ± 21 ms). Conclusions: IMP reflects changes in muscle tension due to the contractile muscle elements.

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