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KMID : 1012020220110040446
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Physical Therapy Rehabilitation Science
2022 Volume.11 No. 4 p.446 ~ p.453
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Correlationship among Smartphone Screen Time, Cervical Alignment, and Muscle Function in University Students
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Cha Hyun-Gyu
Hwang Seon-Young
Eo Jin-Young
Ji Hye-In
Han Ji-Won
Choi Won-Jae
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Abstract
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Objective: The popularization of smartphones can lead to abnormal cervical alignment in university students. The aim of this study was to investigate the relationship among smartphone screen time, cervical alignment, and muscle function in university students.
Design: Cross-sectional study.
Methods: Seventy-five university students participated in the study. They completed the evaluation of cervical alignment and muscle function, such as handgrip strength, proprioception, and muscle quality (tone, stiffness, and relaxation time). All participants recorded their general characteristics and individual smartphone screen time before the evaluation. They were evaluated craniovertebral angle (CVA) using smartphone application (angle meter 360) for measuring cervical alignment. The muscle function was assessed using a digital hand-held dynamometer, dual inclinometer, and MyotonPRO device.
Results: Of all participants, twenty-five university students had forward head posture (CVA<49°, 33.33%). Independent t-test revealed that there were significant differences on smartphone screen time, muscle stiffness, and muscle relaxation between the participants with and without forward head posture (p<0.05). There were significant correlations between the smartphone screen time and the CVA, muscle tone, and muscle relaxation (r＝－0.493, 0.250, and －0.500, respectively).
Conclusions: The results indicate that the university students with forward head posture had high smartphone screen time and muscle stiffness compared to the students without forward head posture, and smartphone screen time might be associated with cervical alignment and muscle quality.
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KEYWORD
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Smartphone, Cervical alignment, Muscle function, Young adult
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