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Evaluating skeletal muscle electromechanical delay with intramuscular pressure.
Shanette A Go1, William J Litchy2, Loribeth Q Evertz1
1Department of Orthopedic Surgery, Mayo Clinic Rochester, 200 1st Street SW, Rochester, MN 55905, USA; Mayo Clinic School of Medicine, Mayo Clinic Rochester, 200 1st Street SW, Rochester, MN 55905, USA.
Journal of Biomechanics
|June 18, 2018
Summary
Intramuscular pressure (IMP) closely mirrors muscle tension, with a significantly shorter delay between IMP and EMG onset compared to force and EMG onset during isometric contractions.
Area of Science:
- Physiology
- Biomechanics
- Human Movement Science
Background:
- Intramuscular pressure (IMP) quantifies fluid pressure within skeletal muscle.
- IMP directly correlates with individual muscle tension during contractions.
Purpose of the Study:
- To assess force, IMP, and electromyography (EMG) development in the tibialis anterior (TA) muscle.
- To evaluate electromechanical delay (EMD) during ramped isometric contractions.
Main Methods:
- Simultaneous measurement of force, EMG, and IMP during ramped isometric contractions.
- Calculation of EMD between force and EMG onset (Δt-EMG force) and IMP and EMG onset (Δt EMG-IMP).
Main Results:
- A statistically significant difference (p < 0.05) was observed between the two EMD measures.
- Mean force-EMG EMD was 36 ± 31 ms, while mean IMP-EMG EMD was 3 ± 21 ms.
Conclusions:
- IMP accurately reflects muscle tension changes driven by contractile elements.
- IMP provides a more immediate indicator of muscle activation than external force measurements.
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