Comparison of Mechanomyogram Signals Using an Accelerometer and a Condenser Microphone during Isometric and Concentric Contractions of the Biceps Brachii Muscle
Keywords:
Electromyogram (EMG), Mechanomyogram (MMG), Power spectral density (PSD), Biceps Brachii MuscleAbstract
According to the evaluation of muscle function during static exercise using a microphone and an acceleration sensor,
accelerometers are more likely to be affected by motion artifacts than microphones. Additionally, microphones are less likely
to be affected by motion artifacts compared to accelerometers. In this study, motion artifacts were analyzed using both an
accelerometer and a microphone. As a result of conducting a variance analysis of the three factors—muscle exertion, velocity,
and elbow joint angle—significant differences were found in all factors (muscle exertion, velocity, and elbow joint angle) in
the MMG signals obtained using a microphone (p < 0.001). Furthermore, a significant interaction effect was found between
velocity and elbow joint angle (p < 0.001). It is suggested that the low-frequency components of the PSD of the MMG are
reduced by increased muscle strength during exertion. However, during dynamic exercise, the low-frequency components of
the MMG signals recorded with the accelerometer (MMGacc) significantly increased. Considering the frequency
characteristics observed in this study, it is concluded that the accelerometer is more likely to capture motion artifacts in the
MMGacc signals within the frequency range of 5 to 10 Hz.
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References
Merletti, R., & Parker, P. J. (2004). Electromyography: Physiology, Engineering, and Non-Invasive Applications, IEEE Press.
Cram, J. R. (1998). Introduction to Surface Electromyography, Aspen Publishers.
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