Spatial and force dependency of mechanomyographic signal features

Time to task failure in shoulder elevation is associated to increase in amplitude and to spatial heterogeneity of upper trapezius mechanomyographic signals

“…In the present study, individual channel normalisation of absolute ARV and MNF values resulted in a lack of spatial dependency for both short duration contraction and sustained contraction. This is in line with a recent study assessing spatial heterogeneity in paraspinal muscles during both short duration and sustained contraction (Madeleine et al 2007b) but in contrast with another study investigating the tibialis anterior muscle MMG maps/force relationship (Madeleine et al 2006a). Individual channel normalisation procedure of the MMG signals most likely disguised important information regarding spatial pattern of MMG maps seen in absolute values.…”

“…Thus, the MNF/force relationship cannot be associated to motor unit recruitment strategies ). Moreover, discrepancies in MNF/force relationships can also be expected due to the role of sensor location on the MMG spectral content (Cescon et al 2004;Madeleine et al 2006aMadeleine et al , 2007b. As for the time domain, spatial dependency was observed in the frequency domain (Figs.…”

“…The MMG maps were characterised by (1) the ARV and MNF modiWed entropy (Madeleine et al 2006a), higher entropy value characterising more uniform distributions;…”

“…In addition to multi-channel EMG systems, multi-channel mechanomyographic (MMG) recordings have been proposed for the assessment of MMG/force relationship and muscle fatigue (Madeleine et al 2006a(Madeleine et al , 2007b. The MMG signal originates from the slow bulk movement of the muscle, oscillations created by the muscle at its own resonance frequency (Barry 1987;Frangioni et al 1987) and pressure waves due to muscle Wbre dimensional changes (Orizio 1993).…”

Ipsilateral resistance exercise prevents exercise-induced central sensitization in the contralateral limb: a randomized controlled trial

“…Previous studies demonstrated the RBE on isolated eccentric contraction of elbow flexors (Muthalib et al 2011) and knee extensors (Behrens et al 2012), but no previous study has examined the contralateral repeated bout effect of TA. In the present study, TA muscle was chosen due to its muscle action, fiber composition, and activation profile (Johnson et al 1973;Madeleine et al 2006) and also because of its appropriateness for NWR recordings (Andersen 2007). Since previous studies have reported attenuated RBE in the contralateral elbow flexors muscle when compared with the ipsilateral side (Howatson and Van Someren 2007;Starbuck and Eston 2012), the secondary bout of eccentric exercise was therefore hypothesized to result in smaller increase in the sensitivity of spinal nociceptive system, and smaller decrease in local muscle blood oxygenation response in both the ipsilateral and the contralateral TA, with a greater attenuation being observed for the ipsilateral condition.…”