Normalizing surface electromyographic measures of the masticatory muscles: Comparison of two different methods for clinical purpose |
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| Institution: | 1. Department of Biomedical Sciences for Health, Functional Anatomy Research Center (FARC), Università degli Studi di Milano, Milano, Italy;2. Private Practice, SST Dental Clinic, Segrate, Italy;3. Department of Oral and Maxillofacial Surgery, University of California and San Francisco Veterans Affairs, San Francisco, CA, United States;4. Department of Ophthalmology, Otorhinolaryngology, and Head and Neck Surgery, School of Medicine, Ribeirão Preto, Craniofacial Research Support Centre, University of São Paulo, Brazil;5. Institute of Bioimaging and Molecular Physiology, National Research Council, Segrate, Italy;1. Laboratory of Biomechanics of Human Movement, Dept. Physical Therapy, Speech and Occupational Therapy, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil;2. Human Performance Laboratory, School of Physical Education and Physiotherapy, Federal University of Amazonas, Amazonas, Brazil;1. University Outpatient Clinic, Sports Medicine & Sports Orthopaedics, University of Potsdam, Germany;2. Bern University of Applied Sciences, Health, Physiotherapy, Bern, Switzerland;1. Resident, Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China;2. Assistant engineer, Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China;3. Associate professor, Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China;4. Associate chief physician, Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China;5. Professor, Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China;1. Bioengineering and Biomechanics Laboratory, Universidade Federal de Goiás, Goiânia, Brazil;2. Laboratory of Biomedical Engineering, Universidade Federal de Uberlândia, Uberlândia, Brazil |
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| Abstract: | PurposeTo compare a new normalization technique (wax pad, WAX) with the currently utilized cotton roll (COT) method in surface electromyography (sEMG) of the masticatory muscles.MethodssEMG of the masseter and anterior temporalis muscles of 23 subjects was recorded while performing two repetitions of 5 s maximum voluntary clenches (MVC) on COT and WAX. For each task, the mean value of sEMG amplitude and its coefficient of variation were calculated, and the differences between the two repetitions computed. The standard error of measurement (SEM) was calculated. For each subject and muscle, the COT-to-WAX maximum activity increment was computed. Participant preference between tasks was also recorded.ResultsWAX MVC tasks had larger maximum EMG amplitude than COT MVC tasks (P < 0.001), with COT-to-WAX maximum amplitude increments of 61% (temporalis) and 94% (masseter) (P = 0.006). WAX MVC had better test-retest repeatability than COT. For both MVC modalities, the mean amplitude (P > 0.391) and its coefficient of variation were unchanged (P > 0.180). The WAX task was the more comfortable for 18/23 subjects (P = 0.007).ConclusionWAX normalization ensures the same stability level of maximum EMG amplitude as COT normalization, but it is more repeatable, elicits larger maximum muscular contraction, and is felt to be more comfortable by subjects. |
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| Keywords: | Surface electromyography Masticatory muscles Reference standards Dental occlusion Proprioception Dental clinics |
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