Influence of the Duration of Smartphone Usage on Flexion Angles of the Cervical and Lumbar Spine and on Reposition Error in the Cervical Spine

스마트폰 사용시간이 목뼈 및 허리뼈의 굽힘각도와 목뼈의 재현오차에 미치는 영향

  • Kim, Yang-Gon (Dept. of Physical Therapy, The Graduate School, Inje University) ;
  • Kang, Min-Hyeok (Dept. of Rehabilitation Science, The Graduate School, Inje University) ;
  • Kim, Ji-Won (Dept. of Rehabilitation Science, The Graduate School, Inje University) ;
  • Jang, Jun-Hyeok (Dept. of Physical Therapy, Haeundae Jaseng Hospital of Oriental Medicine) ;
  • Oh, Jae-Seop (Dept. of Physical Therapy, College of Biomedical Science and Engineering, Inje University)
  • 김양곤 (인제대학교 대학원 물리치료학과) ;
  • 강민혁 (인제대학교 대학원 재활과학과) ;
  • 김지원 (인제대학교 대학원 재활과학과) ;
  • 장준혁 (해운대 자생한방병원 물리치료실) ;
  • 오재섭 (인제대학교 의생명공학대학 물리치료학과)
  • Received : 2013.01.08
  • Accepted : 2013.02.01
  • Published : 2013.02.19


The purpose of this study was to assess the influence of the duration of smartphone usage on cervical and lumbar spine flexion angles and reposition error in the cervical spine. The study included 18 healthy smartphone users (7 males and 11 females). We measured the kinematics of the upper and lower cervical and lumbar spine flexion angles and the reposition error of the upper and lower cervical spine after 3 s and 300 s smartphone use in sitting. A paired t-test was used to compare the effects of the duration of smartphone usage on the kinematics of cervical and lumbar spine flexion angles and reposition error. The flexion angles of the lower cervical and lumbar spine and the reposition error in the upper and lower cervical spine were significantly increased after 300 s smartphone of use (p<.05). However, the flexion angle of the upper cervical spine was not significantly different between the 3 s and 300 s smartphone of use (p>.05). These findings suggest that prolonged use of smartphones can induce changes in cervical and lumbar spine posture and proprioception in the cervical spine.


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