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Torque and surface mechanomyogram parallel reduction during fatiguing stimulation in human muscles.
Massimiliano Gobbo1, Emiliano Cè, Bertrand Diemont
1Dipartimento di Scienze Biomediche e Biotecnologie, Università degli Studi di Brescia, Viale Europa, 11, 25123, Brescia, Italy.
European Journal of Applied Physiology
|February 16, 2006
Summary
Mechanomyogram (MMG) effectively tracks muscle fatigue during electrical stimulation, correlating well with torque loss. This validates MMG as a tool for monitoring fatigue in sports training and rehabilitation.
Area of Science:
- Biomechanics
- Exercise Physiology
- Biomedical Engineering
Background:
- Localized muscular fatigue is crucial in sports training and rehabilitation.
- Assessing fatigue during electrical stimulation protocols requires reliable methods.
- Torque and mechanomyogram (MMG) are potential indicators of muscle contractile changes.
Purpose of the Study:
- To validate mechanomyogram (MMG) as a tool for assessing muscle contractile changes during fatigue.
- To compare MMG analysis with torque measurements during localized muscular fatigue.
- To investigate the utility of MMG in sport training and rehabilitation stimulation protocols.
Main Methods:
- Ten healthy sedentary subjects underwent transcutaneous electrical stimulation of the biceps brachii (BB) and vastus lateralis (VL).
- Torque was measured using a load cell, and MMG was recorded over the muscle bellies.
- A fatiguing stimulation protocol (50 cycles of 2s @ 50Hz and 25s @ 2Hz) was applied after potentiation.
Main Results:
- Both peak torque (pT) and MMG peak-to-peak (MMG-pp) decreased significantly in both BB and VL muscles.
- For BB, pT decreased to 55% and MMG-pp to 60% of initial values.
- For VL, pT decreased to 43% and MMG-pp to 47% of initial values.
- High correlations were observed between pT and MMG-pp changes for both BB (R=0.95) and VL (R=0.94).
Conclusions:
- Mechanomyogram (MMG) is a valid tool for monitoring muscle mechanical fatigue during electrical stimulation.
- MMG can track fatigue development when direct torque measurement is difficult or impossible.
- The findings support the use of MMG in sport training and rehabilitation electrical stimulation protocols.
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