For the anterior tibial muscle, the placement of electrodes followed the point of greater muscle volume, longitudinally to its fiber .
Regarding the comparison of the chewing side preference and the postural muscular electrical potential, when chewing preference was at right, there was greater activation of the electric potential for the sternocleidomastoid muscle at left, as well as greater activation of the electric potential of the anterior tibial muscle at right, significantly.
In both cases of existing o a chewing side preference, there was asymmetry of muscular electrical activation for the sternocleidomastoid and for the anterior tibial muscle. For the other muscles (upper fibers of trapeziums and gluteous medius) there was tendency for a symmetry of muscular electrical activation, when there was right or left chewing preference, as well as a tendency at symmetry of the postural muscular electrical activation for all studied muscles (sternocleidomastoid, upper fibers of the trapeziums, gluteous medius and tibial anterior bilateral), when there was alternate bilateral mastication.
Pairs of EMG electrodes were positioned over the proximal ([TA.sub.prox]) and distal ([TA.sub.dist]) ends of the anterior tibial muscle (mean distance between electrode pairs ~ 12 cm) and over the center of the medial gastrocnemius (MG) and soleus (SOL) muscles.
During contractions, electroencephalographic (EEG) and electromyographic (EMG) signals from the proximal and distal ends of the anterior tibial muscle ([TA.sub.prox] and [TA.sub.dist]), soleus (SOL), and medial gastrocnemius (GM) were recorded.
EEG from Cz (a), EMG from proximal (b), and distal (c) ends of the anterior tibial muscle ([TA.sub.prox] and [TA.sub.dist], resp.); autospectra for Cz (d), [TA.sub.prox] (e), [TA.sub.dist] (f); and coherence for Cz-[TA.sub.prox] (g), Cz-[TA.sub.dist] (h), and [TA.sub.prox]-[TA.sub.dist] (i) during static dorsiflexion.
[TA.sub.prox]: proximal end of anterior tibial muscle; [TA.sub.dist]: distal end of anterior tibial muscle.
PC-based four-channel electroneuromyograph (NEURO-MVP4, Neurosoft, Russian Federation) with global lead of potential oscillations from the motor point of a muscle was used to assess electrobiological activity (EBA) of the crural muscles, such as, musculus gastrocnemius (calf muscle) and musculus tibialis anterior (anterior tibial muscle).
Adequacy coefficient (AC) was derived from division of calf muscle medial head EBA upon dorsal foot flexion by anterior tibial muscle medial head EBA upon plantar foot flexion.
Pre-treatment spastic tonicity can be seen both in the calf muscle and the anterior tibial muscle. At rest the highest and the lowest EBA in the calf muscles was registered in the 1st and 3rd group patients, respectively (144.8 [+ or -] 5.1 versus 127.0 [+ or -] 4.6 mV).
EBA amplitude of the calf muscle and the anterior tibial muscle at rest was found reduced by 34.4% and 46.9%, respectively, clinically manifesting in reduction of the crural muscular tonicity.
The anterior tibial muscles
are dissected stripped from the tibia up to the proximal 1/3 of tibial taking care not to injure the anterior tibial vessels which pass along the anterior compartment.