| Does head posture have a significant effect on the hyoid bone position and sternocleidomastoid electromyographic activity in young adults? | |
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MedLine Citation:
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PMID: 16128355 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The aim of this study was to evaluate the associations between head posture (head extension, normal head posture, and head flexion) and anteroposterior head position, hyoid bone position, and the sternocleidomastoid integrated electromyographic (IEMG) activity in a sample of young adults. The study included 50 individuals with natural dentition and bilateral molar support. A lateral craniocervical radiograph was taken for each subject and a cephalometric analysis was performed. Head posture was measured by means of the craniovertebral angle formed by the MacGregor plane and the odontoid plane. According to the value of this angle, the sample was divided into the following three groups: head extension (less than 95 degrees); normal head posture (between 95 degrees and 106 degrees); and head flexion (more than 106 degrees). The following cephalometric measurements were taken to compare the three groups: anteroposterior head position (true vertical plane/pterygoid distance), anteroposterior hyoid bone position (true vertical plane-Ha distance), vertical hyoid bone position (H-H' distance in the hyoid triangle), and CO-C2 distance. In the three groups, IEMG recordings at rest and during swallowing of saliva and maximal voluntary clenching were performed by placing bipolar surface electrodes on the right and left sternocleidomastoid muscles. In addition, the condition with/without craniomandibular dysfunction (CMD) in each group was also assessed. Head posture showed no significant association with anteroposterior head position, anteroposterior hyoid bone position, vertical hyoid bone position, or sternocleidomastoid IEMG activity. There was no association to head posture with/without the condition of CMD. Clinical relevance of the results is discussed. |
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Authors:
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Saúl Valenzuela; Rodolfo Miralles; María José Ravera; Claudia Zúñiga; Hugo Santander; Marcelo Ferrer; Jorge Nakouzi |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Cranio : the journal of craniomandibular practice Volume: 23 ISSN: 0886-9634 ISO Abbreviation: Cranio Publication Date: 2005 Jul |
Date Detail:
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Created Date: 2005-08-30 Completed Date: 2005-09-20 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 8609491 Medline TA: Cranio Country: United States |
Other Details:
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Languages: eng Pagination: 204-11 Citation Subset: D |
Affiliation:
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Oral Physiology Laboratory, Biomedical Sciences Institute, Faculty of Medicine, University of Chile, Santiago. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Axis / anatomy & histology Cephalometry Cervical Atlas / anatomy & histology Cervical Vertebrae / anatomy & histology Craniomandibular Disorders / pathology, physiopathology Deglutition / physiology Electromyography* Female Head / anatomy & histology* Humans Hyoid Bone / anatomy & histology* Male Muscle Contraction / physiology Neck Muscles / physiology* Occipital Bone / anatomy & histology Odontoid Process / anatomy & histology Posture Signal Processing, Computer-Assisted Sphenoid Bone / anatomy & histology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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