Relationship between the masseter and sternocleidomastoid muscles in the flexion and rotation functions of the cervical, chewing and maximum habitual intercuspation, analyzed by the electromyographic activity
DOI:
https://doi.org/10.5335/rfo.v25i3.13334Keywords:
muscle contraction; electromyography; posture.Abstract
Nowadays, with the frequent technological innovations
added to cell phones favoring their excessive
use, high levels of stress and the fast pace of
life, people have unconsciously adopted new and
different body postures that directly or indirectly
interfere in the position of the spine. An important
postural muscle of the neck is the sternocleidomastoid,
whose important function is to stabilize
it. Objective: to analyze the possible relationship
between the masseter and sternocleidomastoid
muscles, in different positions of the head and cervical
spine, in situations of chewing, resting and
maximum habitual intercuspation. Methodology:
data were collected initially with head and spine
erect, at rest and at maximum habitual intercuspation.
Then, it was collected, always chewing,
with the head and column erect, tilted forward,
backward, right, left, turned to the right and turned
to the left. All moments of data collection
occurred for 5 seconds in each position. Results:
An increase in the electrical activity of the sternocleidomastoid
muscle is observed when chewing
occurs with the head and spine out of the upright
position. In some positions of the head this increase,
in absolute values, is not observed in a relevant
way in the female sex, being noticed in the
male. Conclusions: there is a working relationship
between the masseter and sternocleidomastoid
muscles. This relationship suggests that the second
muscle works in an attempt to stabilize the head
to optimize the masticatory act, an action that is
notably found in men and less actively in women.
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