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ISSN : 2092-8475(Print)
ISSN : (Online)
Journal of International Academy of Physical Therapy Research Vol.10 No.2 pp.1763-1767

Changes of Masticatory Muscle Tone and Stiffness According to Head Posture

Joongsan Wang
Howon University, Gunsan, Korea
Address for correspondence
Joongsan Wang, Ph.D, Prof.
Department of Physical Therapy, Howon University, 64, Howondae 3-gil, Impimyeon, Gunsan-si, Jeollabuk-do, Korea Tel: 82-10-8945-3520


Background: Although previous researches have developed interventions for neck problems, headache, and temporomandibular disorder in patients with forward head posture (FHP), changes in masticatory muscle tone or stiffness as FHP worsening have not been investigated.
Objective: To examine changes in masticatory muscle tone and stiffness through craniovertebral angle (CVA). Design: Cross sectional study
Methods: The subjects were 21 healthy males with normal head posture. Three CVA were established for posture measurement in which the bilateral anterior temporal and masseter muscles were measured during the subjects maintained a series of postures.
Results: The Right masseter muscle significantly increased in stiffness with advancing FHP (p < 0.05). No significant changes were observed in the muscle tone or stiffness of any other masticatory muscles, and no significant differences were found in bilateral masticatory muscle tone or stiffness in each measurement posture.
Conclusions: This study suggests that the increased stiffness of the right masseter muscle as the FHP worsened requires consideration in physical therapy assessment and intervention.