Article

This study aimed to analyse electromyographic activity, masticatory
efficiency, muscle thickness, and bite force of individuals with Duchenne
muscular dystrophy (DMD). METHOD: Forty males aged 4-15 years, 20 with DMD and 20
healthy age-, height-, and weight-matched controls, underwent electromyography
and ultrasonography of temporalis, masseter, and sternocleidomastoid muscles
during postural control of the jaw, mastication, and maximal molar bite force.
RESULTS: The normalized electromyography signals showed higher activity in
masseter and temporal muscles at rest, during protrusion, left and right
laterality, and fatigue condition in the group with DMD than in the comparison
group (p</=0.05). For masticatory efficiency of cycles, in analysis of
non-habitual chewing of flavourless gum, and habitual chewing of peanuts and
raisins, the group with DMD presented lower averages (p</=0.05). For the muscle
thickness, the results showed that there was a lower muscle thickness in the
group with DMD for all muscles during the rest and maximal voluntary contraction,
except for masseter and sternocleidomastoid in the maximal voluntary contraction.
In the maximal molar bite force, the group with DMD presented higher values for
both sides than the comparison group (p</=0.05). INTERPRETATION: Patients with
DMD show muscle changes related to the stomatognathic system, in their activity,
bite force, and muscle thickness.
CI - (c) 2016 Mac Keith Press.

Langue : ANGLAIS