Journal of the Korean Society of Physical Medicine (대한물리의학회지)

The Korean Society of Physical Medicine (대한물리의학회)
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Comparison of Muscle Activation on Cervical and Lumbar Erector Spinae, and Upper Trapezius according to Sitting Postures while using a Smartphone in a Bathroom

화장실에서의 스마트폰 사용 시 앉은 자세에 따른 목, 어깨, 허리의 근활성도에 미치는 영향

  • Seo, Joon-Ho (Department of Medical Science, Graduate School, Daegu Haany University,) ;
  • Lee, Mi-Young (Department of Physical Therapy, College of Biomedical Science, Daegu Haany University) ;
  • Kwon, Hyeok-Gyu (Department of Physical Therapy, College of Health Science, Eulji University)
  • 서준호 (대구한의대학교 대학원 의과학과 물리치료전공) ;
  • 이미영 (대구한의대학교 의과학대학 물리치료학과) ;
  • 권혁규 (을지대학교 보건과학대학 물리치료학과)
  • Received : 2018.11.21
  • Accepted : 2019.02.21
  • Published : 2019.05.31
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Abstract

Purpose: The purpose of this study was to compare the level of muscle activation on the cervical erector spinae (CES), lumbar erector spinae (LES), and upper trapezius (UT) according to the sitting postures while using a smartphone in the bathroom. Method: Thirty-two healthy subjects were recruited for this study. The CES, LES, and UT were evaluated by surface electromyography according to two sitting postures while using a smartphone on the toilet seat. A paired t test was performed for the root mean square of reference voluntary contraction (%RVC) comparisons between two sitting postures, and one-way ANOVA was used to compare the three muscle activations within each posture. Results: A comparison between the two sitting postures revealed the muscle activation of both CESs in sitting posture 2 and both LESs in sitting posture 1 to be significantly higher than those of the others. In sitting posture 1, the muscle activation of both LESs was significantly higher than those of the CES and UT. In sitting posture 2, the muscle activation of both CESs was significantly higher than those of the LES and UT. Conclusion: High muscle activation of the CES and LES was observed according to the sitting postures when using smartphone in the restroom. Therefore, long time use of smartphones on a toilet seat should be avoided.

Keywords

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  1. The Relationships of Smartphone Usage with Spinal Curvature and Neck or Shoulder Pain in School Children vol.29, pp.4, 2020, https://doi.org/10.15857/ksep.2020.29.4.394