Sex differences in masticatory muscle activity in healthy young adults
Original Article, Pol J Public Health, Vol. 132 (2022): 40-43
Michał Ginszt1, Grzegorz Zieliński2, Jacek Szkutnik3, Magdalena Bakalczuk3,
Magdalena Zawadka2, Apolinary Ginszt1, Piotr Gawda2, Piotr Majcher1
1 Department of Rehabilitation and Physiotherapy, Medical University of Lublin, Poland
2 Department of Sports Medicine, Medical University of Lublin, Poland
3 Independent Unit of Functional Masticatory Disorders, Medical University of Lublin, Poland
© 2022 Medical University of Lublin. This is an open access article distributed under the Creative Commons Attribution-NonComercial-No Derivs licence (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Introduction. Several studies analyzed the gender differences in masticatory muscle activity. Previous scientific reports indicate the predominance of the masseter muscle activity in male subjects and the predominance of the temporalis anterior in women. However, there is a lack of studies analyzing the differences in the activity of the mandibular abduction muscles between men and women.
Aim. The presented study evaluated the sex differences in activity within temporalis anterior, masseter, and digastric muscle
in healthy young adults.
Material and methods. Thirty-six healthy young adults aged 20 to 29 years (mean 22±2.6 years) were qualified for the presented study. The subjects were divided into two equal groups (n=18) in terms of gender. The masticatory muscle activity was recorded within the temporalis anterior (TA), the superficial masseter muscle (MM), and the anterior bellies of the digastric muscle (DA). Electromyographic activity was recorded in three conditions: at rest, during maximum voluntary clenching at the intercuspal position, and during maximum voluntary clenching with cotton rolls between teeth.
Results. Significant differences in electromyographic activity between the male and female group were observed within resting activity for the TA-R (Women: 1.98 µV vs. Men: 1.26 µV; p=0.000), TA-L (Women: 2.13 µV vs. Men: 1.33 µV; p=0.000), DA-R (Women: 2.17 µV vs. Men: 1.29 µV; p=0.001), DA-L (Women: 2.13 µV vs. Men: 1.37 µV; p=0.005). Moreover, significant difference in resting activity index was observed within left side (Women: -9.89 % vs. Men: 10.39%; p=0.037), and within right side during clenching with cotton rolls between teeth (Women: 9.83% vs. Men: 25.59%; p=0.016).
Conclusions. Women represent higher resting sEMG activity within the temporalis anterior and digastric muscles than men. Electromyographic patterns may be influenced by gender at rest and during clenching tasks.
Keywords: sEMG, masticatory muscles, sex, young adults.