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Mechanomyographic and electromyographic responses during submaximal cycle ergometry.

T J Housh1, S R Perry, A J Bull

  • 1Department of Health and Human Performance, University of Nebraska, Lincoln 68588-0229, USA. thoush@unlserve.unl.edu

European Journal of Applied Physiology
|January 4, 2001
PubMed
Summary

This study shows that muscle electrical activity (EMG) generally increases during cycling, while muscle mechanical activity (MMG) responses vary with intensity. These findings offer insights into muscle function during exercise.

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Area of Science:

  • Exercise Physiology
  • Biomedical Engineering
  • Muscle Physiology

Background:

  • Understanding muscle responses during exercise is crucial for optimizing training and preventing fatigue.
  • Mechanomyography (MMG) and electromyography (EMG) are non-invasive techniques to assess muscle activity.
  • Previous research has explored EMG changes during exercise, but MMG responses require further investigation across varying intensities.

Purpose of the Study:

  • To investigate the mechanomyographic (MMG) and electromyographic (EMG) responses in the vastus lateralis (VL) and vastus medialis (VM) muscles during continuous cycling at different constant power outputs.
  • To determine how muscle activity, measured by MMG and EMG, changes over time during submaximal and near-maximal intensity exercise.

Main Methods:

  • Eight healthy adults performed incremental and constant power output cycling tests (50%, 65%, 80%, 95% of peak power).

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  • MMG signals were recorded using piezoelectric sensors, and EMG signals using surface electrodes on the VL and VM muscles.
  • Signal amplitudes were normalized, and regression analyses assessed changes over time at different exercise intensities.

    • Main Results:

    • EMG amplitude consistently increased over time for both muscles across most power outputs.
    • MMG amplitude showed varied responses: increasing at 95% Wpeak, decreasing at 50% and 65% Wpeak, and remaining unchanged at 80% Wpeak.
    • MMG patterns were similar between VL and VM muscles, except at the highest intensity (95% Wpeak).

    Conclusions:

    • Muscle electrical activity (EMG) generally increases with sustained cycling exercise.
    • Muscle mechanical responses (MMG) are intensity-dependent, suggesting alterations in motor unit recruitment, discharge rates, or muscle mechanics.
    • MMG provides complementary information to EMG regarding muscle adaptations during exercise at different power outputs.