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Biomedical subjects

M Vitti

Publications and source records attributed to M Vitti.

At least 19 recordsLinked to original sources
PubMed1999

EMG activity of the orbicularis oris and mentalis muscles in children with malocclusion, incompetent lips and atypical swallowing--part II.

The EMG activity of the orbicularis oris (upper and lower), and of the mentalis muscles was verified during several movements of the lips, in 18 children ageing from 8 to 12 years, divided into three groups: one with normal occlusion, and two with class II division 1, with atypical swallowing and/or incompetent lips and who had received no orthodontic treatment. In blowing through a straw the muscular activity of the orbicularis oris and the mentalis was significantly greater in the incompetent lips group. The mentalis presented moderate activity in the competent lips group and negligible in normal occlusion. In puffing out of the cheeks, the malocclusion groups developed marked activity of the orbicularis oris and very marked activity of the mentalis, while the normal occlusion presented moderate and negligible activities, respectively. In pursing of the lips, only the incompetent lips group presented a very marked activity of the lower segment. The compression of the lips against the teeth revealed a marked activity of the upper segment of the orbicularis oris in the groups of malocclusion and the mentalis presented greater activity in the competent lips group. The reciprocal compression of the lips presented a hyperactivity of the three muscles.

Action Potentials↗
PubMed1999

Electromyographic behaviour of the gastrocnemius muscle during knee extension and flexion performed on the leg press.

The gastrocnemius was analysed in 10 male volunteers during knee flexion and extension with the foot in normal, plantar flexion and dorsal flexion positions. Hewlett-Packard surface electrodes, an electromyographic signal amplifier, a computer equipped with an A/D conversion plaque (Model CAD 10/26), a software specially designed to record and analyse the signals, a horizontal leg press, and electrogoniometers were used. The gastrocnemius muscle showed strong potentials at the end of knee extension and beginning of knee flexion. The muscle presented a similar activity both in the upper and lower platforms. As to bilateral action, the right gastrocnemius presented stronger potentials on the upper platforms, whereas the potentials were bilaterally similar on the lower platforms. As for foot position, the gastrocnemius presented strong potentials when the foot was in plantar flexion. The remaining positions had no effect on the work of the muscle.

Adult↗
PubMed1998

EMG activity of the orbicularis oris and mentalis muscles in children with malocclusion, incompetent lips and atypical swallowing--part I.

The function and the level of activity of the orbicularis oris (upper and lower), and of the mentalis muscles were verified electromyographically in resting position and in several movements and carried out in 18 children aged 8-12 years, divided into three groups: one with normal occlusion, and two with Class II division 1, with atypical swallowing and/or incompetent lips, who had received no orthodontic treatment. It was observed that, in a resting position with the lips separated, there was no activity in any of the muscles. When there was a contact of the lips, action potentials were recorded in the muscles studied, in those individuals with incompetent lips. In the movements of sucking either through a straw or a pacifier and the thumb, there were no differences among the groups. The incompetent lips group presented very marked muscle activity of the lower orbicularis oris and mentalis in the movement of sucking a lollipop. In deglutition of saliva, the orbicularis oris presented slight activity, and the mentalis, moderate. In deglutition of water, the mentalis presented very marked activity, whereas, the upper and lower orbicularis oris presented moderate and marked activities, respectively.

Action Potentials↗
PubMed1998

Electromyographic evaluation of the rectus femoris muscle during exercises performed on the leg press.

The rectus femoris was analysed in 10 volunteers during knee flexion and extension with the feet in normal, plantar flexion and dorsal flexion positions. Hewlett-Packard surface electrodes, an electromyographic signal amplifier, a computer equipped with an A/D conversion plaque (Model CAD 10/26), software specially designed to record and analyse the signals, Horizontal Leg Press, and electrogoniometers were used. The rectus femoris muscle showed strong potentials at the beginning of knee extension. In the simultaneous bending of the knee and hip the activity was strong toward the end of the movement. The rectus femoris showed a similar activity both in the upper and lower platforms. As for foot positions, the rectus femoris showed the smallest potentials with the foot in plantar flexion and the largest ones with the foot in dorsal flexion.

Adult↗
PubMed1996

Electromyographic validation of basic exercises for physical conditioning programmes. II. Analysis of the deltoid muscle (anterior portion) and pectoralis major muscle (clavicular portion) in rowing exercises with closed grip.

The electromyographic activity of the shoulder muscles deltoid-anterior portion (DA) and pectoralis major-clavicular portion (PMC) was tested on 24 male volunteers using a 2 channel TECA TE4 electromyograph and Hewlett Packard surface electrodes during the execution of three different modalities of rowing exercises with closed grip. All rowing exercises were inefficient to determine action potential levels in the PMC but two of them were extremely efficient to the DA: the upright rowing exercise and the sitting rowing exercise. Some suggestions to the use of the tested exercises are presented by the authors.

Action Potentials↗
PubMed1996

Electromyographic validation of basic exercises for physical conditioning programmes. III. Influence of the grip in the capacity of the rowing exercises in determining action potential levels for the deltoid and the pectoralis major muscle.

The electromyographic activity of the shoulder muscles Deltoid--anterior portion (DA) and Pectoralis major--clavicular portion (PMC) was tested on 24 male volunteers using a 2 channel TECA TE4 electromyograph and Hewlett Packard surface electrodes during the execution of three different modalities of rowing exercises comparing middle grip with closed grip. Statistical comparisons showed that in both PMC and DA closed grip determined muscular solicitation higher than middlegrip excepting sitting rowing. The authors present some suggestions to the use of the tested exercises.

Action Potentials↗
PubMed1994

Recombinant soluble human thrombomodulin: a randomized, blinded assessment of prevention of venous thrombosis and effects on hemostatic parameters in a rat model.

UNLABELLED: Thrombomodulin is an endothelial surface receptor that binds thrombin and accelerates the activation of protein C. We compared the effects of a recombinant thrombomodulin analog (TME), recombinant hirudin (r-HIR), heparin sodium (HEP), and normal saline (Control) on thrombus formation, activated partial thromboplastin time (APTT), thrombin time (TT), platelet aggregation and tail transection bleeding time (BT) in a rat model of vena cava thrombosis. RESULTS: TME, r-HIR and HEP prevented venous thrombosis in this model in a dose-dependent manner. At the dose required to reduce vena cava thrombosis by 50% (ED50), TME did not prolong the APTT or TT as did HEP and r-HIR. Platelet aggregation in response to thrombin was not effected by TME but was inhibited by both r-HIR and HEP. BT did not differentiate the agents tested. CONCLUSION: TME inhibited venous thrombosis in a rat vena cava model with less effect on hemostatic variables than HEP or r-HIR.

Animals↗
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↗