Relationship between functional laterality and electromyographic muscle activity – a pilot study

Abstract: Human brain consists of two hemispheres which are a harmonized centre of the nervous system. Despite their integration there are some differences between their functioning in the area of motor activity, emotions, visual-spatial function, and speech. Functional asymmetry in the area of motor activity may have an influence on heavier functional burdening of dominant side, thus influencing distribution of muscular tension. The aim of the study was to determine connection of one- sided lateralization with a change in muscular activity of masticatory apparatus muscles and a group of flexors and extensors of an arm. 36 adult women (average age 22 ±2 years old), in whom no functional disorders of temporomandibular joints were diagnosed, took part in the study. In order to determine lateralization, a questionnaire prepared by the researchers and an interview were used. Using these, 13 women were qualified to study group of one-sided lateralization (right: eye, ear, upper limb, lower limb). In order to assess muscular activity of masseter and temporal muscles, BioEMG III electromyograph was used. Pressure pain threshold in area of trapezius muscle and in a group of flexors and extensors of an arm was determined based on digital algometre FDIX. Statistical analysis was made with Mann–Whitney U test. Despite statistically significant differences, electromyographic examination showed higher bioelectric activity of right temporal muscle and left masseter muscle. Lower pressure pain threshold was observed in the left trapezius muscle, the flexors on the right and the extensors on the left side. Statistical significance was determined to be 0.05. Muscular tension and pressure pain threshold do not seem to be connected with lateralization, however, in order to confirm this issue, further studies on a bigger group of people are needed.

Grzegorz Zielinski, Marta Suwala, Michał Ginszt, Katarzyna Lipa, Jacek Szkutnik

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