Standardization of the Electromyographic Signal Through the Maximum Isometric Voluntary Contraction

Botelho, André Luís; Gentil, Flávio Henrique Umeda; Sforza, Chiarella; Silva, Marco Antônio Moreira Rodrigues da

doi:10.1179/crn.2011.005

Cited by 16 publications

(9 citation statements)

References 19 publications

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“…Similarly, kinesiographic measurements were performed following standardized, well-designed protocols (18). Several studies show that tests made using sEMG do not differ significantly from intramuscular tests and are easily reproducible when performed with properly standardized protocols (19-21). …”

Section: Discussionmentioning

confidence: 99%

Electromyographic activity of the jaw muscles and mandibular kinematics in young adults with theoretically ideal dental occlusion: Reference values

Campillo

Martín²,

Jc³

et al. 2017

Med Oral

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Background: A necessary step to use neuromuscular analysis as diagnostic tool is to establish normal reference values for the physiological range in a healthy population. Surface electromyographic (sEMG) activity of the jaw muscles and mandibular kinematics were measured in young adults with theoretically ideal dental occlusion to determine normal reference values during different tasks. Differences between the sexes were evaluated. Material and Methods: Forty young adults (20 men, 20 women; mean age 22.8 ± 3.9 years) with theoretically ideal dental occlusion were selected using very restrictive criteria. sEMG activity of the anterior temporalis (AT), posterior temporalis, masseter (MA), and suprahyoid muscles were evaluated in the rest position and during swallowing, mastication, and clenching. Mandibular kinematics in the rest position and during maximum excursions were assessed. Asymmetry, activity, and torque indices and MA/AT ratios were calculated. Results: For all muscles, sEMG values were 1.01-3.57 µV at rest, 3.50-10.85 µV during swallowing, and 41.04-86.59 µV during mastication. During clenching, values were 230.08-243.55 µV for the AT and MA muscles. Mean total asymmetry, activity, and torque indices at rest were 20.34 %, -15.04 %, and 19.02 %, respectively; during clenching, these values were 6.14 %, -2.62 %, and 4.46 %. MA/AT ratios were near 1. Kinematic measurements during lateral excursion, protrusive and maximum opening were 7.54, 8.44, and 37.38 mm respectively; lateral mandibular shift was 1.41 mm; free way and lateral displacement at rest were 1.40 and 0.26 mm. Right MA activity during mastication and clenching was higher in men than women. Conclusions: Reference values for sEMG activity and mandibular kinematics were determined. Some muscular asymmetry and torque were observed.

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Section: Discussionmentioning

confidence: 99%

Electromyographic activity of the jaw muscles and mandibular kinematics in young adults with theoretically ideal dental occlusion: Reference values

Campillo

Martín²,

Jc³

et al. 2017

Med Oral

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“…For masseter and temporalis muscles, tasks of maximum forceful tooth clenching at the intercuspal jaw position are performed to induce maximal voluntary isometric contraction as a reference value. Tasks involving biting down on the dental surfaces, cotton rolls, or other materials with maximal or submaximal effort are performed to standardize the amplitude variable and to get relevant signals of interest (7)(8)(9)(10)(11)(12)(13).…”

Section: Repeatability Of Measurements Of Surface Electromyographic Vmentioning

confidence: 99%

Repeatability of measurements of surface electromyographic variables during maximum voluntary contraction of temporalis and masseter muscles in normal adults

Han²,

Park

et al. 2017

Journal of Oral Science

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This study evaluated the intraexaminer repeatability of measurements of surface electromyography (EMG) variables and functional indices of the myoelectric signals from the masseter and temporalis muscles bilaterally in 15 healthy men. The test was repeated on two different days without templates. The resting muscle activity was recorded once, and two kinds of maximum voluntary contraction (MVC) tasks were performed and recorded three times. The two MVC tasks involved clenching the teeth and biting down on two cotton rolls bilaterally with the posterior teeth. The intraclass correlation coefficient (ICC) of amplitude was >88% and that of frequency was >95% during the two MVC tasks but not under resting conditions. The ICC of the asymmetry and activity indices during the two MVC tasks was >76%. A Bland-Altman analysis revealed no significant difference in amplitude or frequency or in the two indices between the two days during the MVC tasks. In conclusion, the measurements of surface EMG variables and the indices obtained according to the study protocol were highly repeatable in healthy men. Additional studies using templates and intraexaminer measurement errors are warranted in both men and women for complete validation of these findings.

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“…The jig was then slightly reduced and retested obtaining a muscular recruitment very similar to those recorded in healthy young subjects with sound dentition (Fig. 6) 24, [41][42] . The new EMG tested mandibular position (wearing the modified jig) was used as occlusal posterior vertical index to produce the final indirect overlays.…”

Section: Discussionmentioning

confidence: 79%

“…Different sEMG studies have made use of the protocol and related indexes proposed by Ferrario et al to evaluate the masticatory muscles 16,24,[41][42][43][44] . The only difference between two acquisitions (on cotton rolls and in IP) is dental contact, thus limiting the technical and biological noise inherent in this instrumental analysis.…”

Section: Discussionmentioning

confidence: 99%

Standardized Electromyographic Indexes Allow a Reliable Measurement of Masticatory Muscles Function

Rosati¹,

Semelewa²,

Сатыго³

et al. 2016

EDUJ

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Introduction: Surface electromyography (sEMG) allows the quantitative and qualitative analysis of muscles recruitment and it is a method currently used in research and in the clinical practice. Considering that sEMG assesses the portion of muscular electrical activity that reaches cutaneous surface, a well-standardized protocol should be used, allowing to remove (or reduce) technical and biological artefacts. Methodology: To evaluate the repeatability of the normalized indexes describing masticatory muscles sEMG, the standardized cutaneous myoelectric activity of Temporalis Anterior and Masseter muscles was recorded twice during a one week interval (Acquisition sessions T1 and T2) in 20 young healthy adults. The data obtained during T1 and T2 were compared. A clinical case was shown as an example of clinical sEMG application. Results: No significant differences in the standardized indexes elaborated by sEMG signals of T1 and T2 acquisition sessions were found, strengthening the effectiveness of the standardization procedure. Conclusion: sEMG indexes allow the evaluation of occlusal-induced proprioceptive mediated muscular recruitment in a reliable way. This measurement protocol can be clinically applied to estimate the muscular adaption to new occlusal conditions or to re-establish physiological muscular coordination.

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Standardization of the Electromyographic Signal Through the Maximum Isometric Voluntary Contraction

Cited by 16 publications

References 19 publications

Electromyographic activity of the jaw muscles and mandibular kinematics in young adults with theoretically ideal dental occlusion: Reference values

Electromyographic activity of the jaw muscles and mandibular kinematics in young adults with theoretically ideal dental occlusion: Reference values

Repeatability of measurements of surface electromyographic variables during maximum voluntary contraction of temporalis and masseter muscles in normal adults

Standardized Electromyographic Indexes Allow a Reliable Measurement of Masticatory Muscles Function

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