Physical Therapy Rehabilitation Science

korean Academy of Physical Therapy Rehabilitation Science (물리치료재활과학회)
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Correlationship among Smartphone Screen Time, Cervical Alignment, and Muscle Function in University Students

  • Hyungyu Cha (Department of Physical Therapy, Joongbu University) ;
  • Seonyoung Hwang (Department of Physical Therapy, Joongbu University) ;
  • Jinyoung Eo (Department of Physical Therapy, Joongbu University) ;
  • Hyein Ji (Department of Physical Therapy, Joongbu University) ;
  • Jiwon Han (Department of Physical Therapy, Joongbu University) ;
  • Wonjae Choi (Department of Physical Therapy, Joongbu University)
  • Received : 2022.11.29
  • Accepted : 2022.12.19
  • Published : 2022.12.31
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Abstract

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.

Keywords

Acknowledgement

본 연구에서 문헌고찰을 위해 힘써 주신 중부대학교 간호학과 연예림 양에게도 감사의 마음을 전합니다.

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