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KMID : 1035420210090040149
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Journal of The Korean Society of Integrative Medicine
2021 Volume.9 No. 4 p.149 ~ p.158
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Comparison of Craniovertebral Angle and Muscle Properties after Smartphone Use in Healthy Individuals with and without Forward Head Posture
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Son Dong-Yoon
Chun Woo-Chan
Park Soo-Kyoung
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Abstract
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Purpose : Forward head posture (FHP) is one of the most common postural malalignment of the cranio-cervical region. Previous studies have reported that FHP might affect both cervical and temporomandibular joint (TMJ) muscles, but still remains unclear. Thus, we identified that whether FHP has an influence on muscle properties of sternocleidomastoid (SCM) and TMJ muscles and pressure pain threshold (PPT) of TMJ.
Methods : The craniovertebral angle (CVA) was evaluated using Dartfish motion analysis to assess FHP in fifteen healthy young individuals aged 18 to 22 years. Each subject was divided into FHP and control groups according to their CVA. Then, smartphone task for 15-minutes was given to both groups. CVA, muscle properties and PPT of pre- and post-task measurements were assessed. MyotonPro was used to measure muscle properties of masseter, digastric and SCM. PPT of TMJ was measured with algometer.
Results : CVA significantly changed within- and between-group. Masseter muscle showed between-group significance in muscle tone, stiffness and elasticity, however, a significant within-group difference was only found in muscle stiffness of control group. Digastric muscle showed significant between-group difference in muscle tone, however, significant within-group difference was only found in muscle tone of FHP group. No significances were found in muscle properties of SCM and PPT of TMJ in both groups.
Conclusion : Temporary smartphone usage could worsen FHP regardless of the head posture, but especially influences individuals with FHP more. We also found some between- and within-group differences in TMJ muscle properties, but not in SCM properties and PPT of TMJ. These results indicate that FHP could also induce the changes in muscle properties of TMJ. Therefore, further studies with various experimental designs investigating the relationship among FHP, SCM, and TMJ are needed to prevent the secondary musculoskeletal problems due to FHP.
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KEYWORD
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forward head posture, temporomandibular joint, muscle properties, smartphone
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