Motor unit acceleration maps and interference mechanomyographic distribution

System identification of the mechanomyogram from single motor units during voluntary isometric contraction

“…Moreover, the signal is more oscillatory than the displacement because the differential enhances high-frequency components. The waveform of the MMG varies depending on the position of the acceleration sensor [2,4]. The sensor was positioned close to the anconeus muscle belly, which was *4 cm on the distal side of the olecranon.…”

The effects of skinfold thicknesses and innervation zone on the mechanomyographic signal during cycle ergometry

“…Most studies that have examined the effect of accelerometer location on the MMG signal have placed the accelerometers proximal, distal, and/or over the IZ (Cescon et al, 2004;Farina et al, 2008;Madeleine et al, 2006;Maton et al, 1990). The results of these studies indicated that the IZ had no consistent effect on MMG amplitude and frequency domain parameters during isometric muscle actions (Cescon et al, 2004;Farina et al, 2008;Madeleine et al, 2006). For example, Cescon et al (2004) examined the effects of accelerometer placement sites over the biceps brachii, tibialis anterior, and upper trapezius muscles during isometric muscle actions.…”

“…Previous studies, however, have reported conflicting results regarding the effect of the IZ on MMG amplitude and MPF during isometric muscle actions (Cescon et al, 2004;Farina et al, 2008;Madeleine et al, 2006). For example, Cescon et al (2004) reported that for various muscles, accelerometers placed over the IZ resulted in MMG amplitude and MPF values that were greater than, less than, or not different from those measured proximal or distal to the IZ.…”

Verification of the functionality of device for monitoring human tremor

“…Similar multi-channel MMG systems were used for, e.g., recognizing patterns of a forearm muscle activity (6 siliconeembedded microphone probes) [14], analyzing effect of a bulk movement (i.e., deformation of soft tissues surrounding measurement points) on the recorded muscular signals (5 single-axis accelerometer probes) [15], analyzing two-dimensional distribution of surface MMG signal (12 dual-axis accelerometer probes arranged in a 3 Â 4 matrix [16,17]; 15 single-axis accelerometer probes arranged in a 3 Â 5 matrix [18,19]), investigating the effect of sensor position along the muscle fibres on the MMG signal features (up to 8 single-axis accelerometer probes) [20], determining the propagation direction of oscillations in the examined muscle during voluntary contraction (15 single-axis accelerometer probes arranged in a 3 Â 5 matrix) [21]. An example of a specialized commercial MMG system is the Biopac MP150 acquisition system fitted with accelerometric transducers TSD250/251 (BIOPAC Systems, Inc., CA, USA).…”