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Biomedical subjects

M Vitti

Publications and source records attributed to M Vitti.

At least 37 records · Page 2Linked to original sources
PubMed1994

Electromyographic study of the trapezius and deltoideus in elevation, lowering, retraction and protraction of the shoulders.

The electromyographic activity of the trapezius and deltoideus was analyzed using a 2-channel TECA TE4 electromyograph and needle electrodes in 16 male volunteers in the following movements of the shoulders elevation, lowering, protraction and retraction. The superior portion of the trapezius was active in the elevation and lowering of the shoulders. The middle and inferior portions were active in retraction. The deltoideus was practically inactive in all these movements.

Adult↗
PubMed1990

Electromyographic study of the trapezius (pars superior) and serratus anterior (pars inferior) in free movements of the arm.

The emg activity of the trapezius (pars superior) and serratus anterior (pars inferior) mm. in free movements of the arm was examined in 25 young adult volunteers of both sexes, using a 2-channel TECA TE4 electromyograph with single coaxial needle electrodes. The records obtained showed that: 1) In abduction, flexion, adduction and extension of the arm, TS and SI act synergically; 2) The activity of both muscles increases gradually in abduction and flexion when the scapular rotation occurs. TS also acts as scapular elevator, a movement which occurs simultaneously with abduction and flexion; 3) The activity of both muscles decreases gradually in adduction and extension which controls the return of the scapula and clavicle to the initial position; 4) In hyperextension TS and SI are inactive.

Action Potentials↗
PubMed1990

Electromyographic study of the sternocleidomastoid muscle in head movements.

The function of the sternocleidomastoid muscle in head movements of 30 young individuals (19-28 years old, both sexes) was studied electromyographically using a TECA TE-4 electromyograph and Beckman surface electrodes. Action potentials were found in the following head movements: free heterolateral rotation; free homolateral inclination; free and counter-resistance protraction; free and counter-resistance flexion and free extension. These movements were performed with the subjects seated and in supine position.

Action Potentials↗
PubMed1989

Electromyographic study of the trapezius (pars superior) and serratus anterior (pars inferior) muscles in free movements of the shoulder.

The trapezius (pars superior) and serratus anterior (pars inferior) muscles were analyzed in 25 adult volunteers from both sexes with a 2-channel TECA TE4 electromyograph with single coaxial needle electrodes. It was observed that in elevation and lowering of the shoulders, the trapezius shows preponderant activity. During retraction, both muscles are inactive, and during protraction, only the serratus anterior is inactive.

Action Potentials↗
PubMed1985

Electromyographic study of the trapezius (upper portion) and levator scapulae muscles in some movements of the shoulders.

The trapezius (upper portion) and levator scapulae mm. were analyzed in 30 adult volunteers of both sexes with a 2 channel TECA TE4 electromyograph and single coaxial needle electrodes. It was noticed that in elevation and lowering of the shoulders both muscles act synergically, and during the lowering, they act to control the return of the shoulders to the initial position. During retraction and protraction of the shoulders these muscles are inactive. In these movements no significant difference was noticed in the activity of these muscles in relation to sex.

Adult↗
PubMed1981

[Electromyographic study of trapezius (middle portion) and rhomboideus major muscles submitted to an isometric tension (author's transl)].

The participation of the trapezius (middle portion) and rhomboideus major muscles submitted to an isometric tension (holding downward dumbells of 11, 15 and 19 kg) was analysed in 40 young adults male volunteers. A 2 channel TECA TE4 electromyograph connected with single coaxial needle electrodes was used. In initial phase of the tests, holding downward, generally the trapezius and rhomboideus major muscles showed activity and no activity respectively. In the cases where activity was present during the downward positions it was reduced gradually until complete rest.

Action Potentials↗
PubMed1981

Electromyographic study of the trapezius (middle portion) and rhomboideus major muscles in free circumduction and pendular movements of the arm.

The authors studied electromyographically the activity of the trapezius (middle portion) and rhomboideus major muscles in circumduction and pendular movements of the arm. They verified that the rhomboideus major muscle presented alternated period of activity and inactivity, while the trapezius (middle portion) muscle showed continuous activity of greater or smaller intensity according to the phases of these movements.

Adult↗
PubMed1980

[Electromyographic analysis of the levator scapulae and rhomboideus major muscle in movements of the upper limb (author's transl)].

The participation of the levator scapulae and rhomboideus major muscles in some movements of upper limb was analysed in 21 young adult male volunteers. A 2 channel TECA TE 4 electromyograph connected with single coaxial needle electrodes was used. In abduction, elevation, adduction, flexion and circunduction occurred participation of both muscles in free movements of the upper limb. In extension, however, these muscles were inactive. In the same movements analysed with load, it was registered major intensity of action of these muscles as compared with those obtained in free movements.

Arm↗
PubMed1979

Electromyographic study of the subclavius muscle.

The electromyographic study of the subclavius muscle (SM) was performed in 31 different movements, in 12 subjects (10 male and 2 female) aged from 17 to 28 years. The action potentials were obtained with an electromyograph Teca TE 4. Our findings suggest that the SM acts mainly on the stability of the sternoclavicular joint; with more or less intensity according to the degree of the clavicular interaction with the movements of the peripheral parts of the superior limb. The SM seems to act as a substitute for the ligaments of the sternoclavicular joint.

Adolescent↗
PubMed1977

Integrated actions of masticatory muscles: simultaneous EMG from eight intramuscular electrodes.

In 29 normal persons with complete dental arches, the muscular activity of the temporalis, masseter, medical pterygoid, anterior belly of the digastric, mylohyoid and geniohyoid muscles was studied electromyographically with bipolar fine wire electrodes during various mandibular movements--both resisted and unresisted. Action potentials were recorded on FM magnetic tape and each experiment was also videotaped. Temporalis muscle was active during centric closing of the jaw with either contact of the teeth, or against resistance; during free lateral movements to the ipsilateral side, either against resistance or occlusal contact; during incisor gum chewing, molar gum chewing on ipsilateral or contralateral sides, during normal mastication; and during forceful centric occlusion. Activity occurred in the masseter and medial pterygoid muscles during the following movements; closing the jaw slowly either without occlusal contact or with occlusal contact and against resistance; free lateral movement to contralateral side, either against resistance or with occlusal contact; protraction of the jaw either without occlusal contact or with occlusal contact; swallowing either saliva or water; incisor gum chewing with either the ipsilateral or contralateral molars; normal mastication; and during forceful centric occlusion. Activity occurred in the digastric, mylohyoid and geniohyoid muscles during the following movements; opening of the jaw either slowly or maximally against resistance; closing the jaw against resistance; free lateral movement to ipsilateral and contralateral sides, either against resistance or with occlusal contact; protraction against resistance of the jaw either without or with occlusal contact; swallowing saliva and water; and protraction of the tongue. They work in antagonism (reciprocally) during gum chewing and normal mastication.

Action Potentials↗
PubMed1975

Muscles of mastication in small children: an electromyographic analysis.

The temporalis, masseter, and depressor muscles of fifteen normal children were studied electromyographically to determine their activities during the position of resting tonus, during various movements of the mandible, and during the act of swallowing. Analysis of our results led to the following conclusions: 1. Resting tonus of the mandible does not depend on neuromuscular activity in the three portions of the temporalis, masseter, and depressor muscle group; they were inactive bilaterally. 2. Opening of the jaw either slowly or maximally, and against resistance, is brought about by the contraction of the depressor muscle group. 3. Closing of the jaw quickly is brought about mainly by greater contraction of the masseter muscle, and slightly by contraction of the temporalis. 4. Closing the jaw quickly with occlusal contact of the teeth is effected by the temporalis and masseter muscles. 5. Protraction of the jaw is performed by contraction of the masseter muscles. The depressor muscle group contracts to maintain the slight depression followed by the protraction. 6. Swallowing saliva and water is accompanied by contractions of the depressor muscle group. 7. Incisor chewing of gum and peanuts mainly recruits marked contraction of the masseter muscle. Some slight-to-moderate activity is achieved by the temporalis. The depressor muscle group acts in antagonism with the elevator muscles. 8. Chewing gum on the right and left molar sides and normal mastication are effected by the contraction of the temporal and masseter muscles. The suprahyoid muscle group acts in antagonism with the elevator muscles. 9. Normal children with deciduous teeth have patterns that are similar to those of normal adults.

Child↗