Influence of bite force on jaw muscle activity ratios in subject-controlled unilateral isometric biting |
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| Authors: | Lei Chen Peter Alfred Pröschel Thomas Riccardo Morneburg |
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| Institution: | 1. Dept. of Prosthodontics, Peking University School and Hospital of Stomatology, 22 Zhongguancun Nandajie, Haidan District, Beijing 7000 87, PR China;2. Dental Clinic 2, Department of Prosthodontics, University of Erlangen-Nürnberg, Glückstrasse 11, D 91054 Erlangen, Germany;1. ENT of MUMS, Iran;2. Pediatric Neurology of MUMS, Iran;3. Family Medicine, Söderhamn, Sweden;4. Social Medicine of MUMS, Iran;1. Department of Oral and Maxillofacial Surgery, Ehime University Graduate School of Medicine (Chief: Prof. HAMAKAWA Hiroyuki), 454 shitsukawa, Toon city, Ehime, Japan 791-0204;2. Department of Oral and Maxillofacial Surgery, Kyushu University Graduate School of Medicine, 3-1-1, HigashikuMaidashi, Fukuoka city, Fukuoka, Japan 812-8582;1. School of Health and Biosciences, Pontifícia Universidade Católica do Paraná, Curitiba, Brazil;2. School of Dentistry, Marquette University, Milwalkee, USA;1. Department of Periodontology, Service of Odontology, Rothschild Hospital, Assistance Publique - Hopitaux de Paris, Université Paris 7 – Denis Diderot, Unité de formation et recherche of Odontology, Paris 75006, France;2. Faculty of Dental Medicine, Université de Montréal, CP 6128 Succursale Centre-Ville, Montreal, Quebec H3C 3J7, Canada;3. Sleep Medicine and Respiratory Function Unit, Saint Antoine Hospital, Assistance Publique - Hopitaux de Paris, Paris 75012, France;1. Department of Cerebral Palsy Center, Sichuan Rehabilitation Hospital, Bayi road, Yongning Town, Wenjiang District, Chengdu, Sichuan, 611135, China;2. Department of Functional Neurosurgery, Shanghai Tong Ren Hospital, # 1111, Xianxia road, Changning District, Shanghai, 200336, China |
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| Abstract: | Ratios of muscle activities in unilateral isometric biting are assumed to provide information on strategies of muscle activation independently from bite force. If valid, this assumption would facilitate experiments as it would justify subject-control instead of transducer-based force control in biting studies. As force independence of ratios is controversial, we tested whether activity ratios are associated with bite force and whether this could affect findings based on subject-controlled force. In 52 subjects, bite force and bilateral masseter and temporalis electromyograms were recorded during unilateral biting on a transducer with varying force levels and with uniform subject-controlled force. Working/balancing and temporalis/masseter ratios of activity peaks were related to bite force peaks. Activity ratios were significantly but weakly correlated with the bite force. The subject-controlled force varied within ±25% around the prescribed force in 95% of all bites. This scatter could cause a variation of group mean activity ratios of at most ±6% because of the weak correlation between bite force and ratios. As this small variation is negligible in most cases, subject-control of bite force can be considered an appropriate method to obtain group means of relative muscle activation in particular when force control with transducers is not feasible. |
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