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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Reliable measurement of incisal bite force for understanding the control of masticatory muscles

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Author(s):
Moreira, Luciana S. [1, 2, 3] ; Elias, Leonardo A. [4, 3] ; Germer, Carina M. [3] ; Palomari, Evanisi T. [1, 2]
Total Authors: 4
Affiliation:
[1] Univ Estadual Campinas, Inst Biol, Cellular & Struct Biol Grad Program, Campinas, SP - Brazil
[2] Univ Estadual Campinas, Inst Biol, Dept Struct & Funct Biol, EMG Motor Control & Expt Electrothermotherapy Lab, Campinas, SP - Brazil
[3] Univ Estadual Campinas, Sch Elect & Comp Engn, Dept Biomed Engn, Neural Engn Res Lab, Campinas, SP - Brazil
[4] Univ Estadual Campinas, Ctr Biomed Engn, Campinas, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: ARCHIVES OF ORAL BIOLOGY; v. 112, APR 2020.
Web of Science Citations: 0
Abstract

Objective: In the present study, we aimed at evaluating the steadiness of incisal bite force during isometric contractions of masticatory muscles. Design: Two separate experiments were carried out in 11 healthy young women. A first experiment was performed to test the reliability of our protocol for measurement of incisal bite force steadiness. The second experiment aimed to evaluate the steadiness of incisal bite force at four submaximal (i.e., percentage of maximum voluntary contraction, MVC) levels (5 %MVC, 10 %MVC, 15 %MVC, and 20 %MVC), along with the bilateral myoelectric activity of two masticatory muscles (temporalis and masseter). Results: The results from the first experiment showed that our protocol is substantially reliable (intraclass correlation coefficient, ICC > 0.80) for estimating force variability and moderate reliable (0.60 < ICC < 0.80) for estimating spectral properties of force signals. In the second experiment, we found that force standard deviation (SD) increased proportionally to the power of mean force, and coefficient of variation (CoV) was higher at low-intensity contractions and maintained at an approximately constant level for high-intensity contractions. The force-EMG relationships were linear for both muscles at the contraction intensities evaluated in the study (5 % MVC to 20 %MVC), and the median frequency did not change with contraction intensity. Conclusion: Therefore, we presented a reliable method to estimate the incisal bite force, along with additional data on force control and myoelectric activity of jaw elevator muscles during isometric steady contractions. (AU)