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http://dx.doi.org/10.5762/KAIS.2021.22.2.659

The Effect of Gaze Directions and Pressure Levels on longus colli and Sternocleidomastoid Thickness during Cranio-cervical flexor Exercise in Young Adults  

Cha, Ha-ri (Department of Physical Therapy, Konyang University)
Lee, Byoung-Kwon (Department of Physical Therapy, Konyang University)
Seo, Dong-Kwon (Department of Physical Therapy, Konyang University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.22, no.2, 2021 , pp. 659-666 More about this Journal
Abstract
This study aimed to investigate the effect of changes in pressure levels and gaze directions on deep neck flexor muscle thickness. Twenty-seven subjects participated in this study. Ultrasound imaging of the longus colli (LC) and sternocleidomastoid (SCM) were measured in four gaze directions (0°, 20°, 40°, 60°) and five pressure levels (20 mmHg, 22 mmHg, 24 mmHg, 26 mmHg, 28 mmHg) during cranial-cervical flexor (CCF) exercises. Repeated ANOVA was performed for analysis of muscle thickness difference according to gaze direction and pressure levels in LC and SCM. Results: LC showed a significant difference between 0° and 20°, 0° and 40°, and 0° and 60° at pressures of 20 mmHg and 22 mmHg (p<.05). SCM displayed a significant difference between 0° and 20°, 20° and 40°, and 40° and 60° at 28 mmHg (p<.05). In this study, it was found that setting the gaze direction to 20° for the CCF exercise can increase the activation of LC and lower the activity of SCM to obtain the effect of exercise. Based on the results of this study, it is hoped that the beneficial effects of the CCF exercise can be increased by setting an optimal gaze direction in a clinical environment.
Keywords
Longus colli; Sternocleidomastoid; Cranio-cervical flexor exercise; Ultrasonography; Gaze direction;
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