Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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Biomechanical Analysis of a Smartphone Task with Different Postures

스마트폰 사용 자세에 따른 운동역학적 변인 분석

  • Kim, Dong-Soo (Department of Physical Education, Graduate School of Kyungpook National University) ;
  • Chae, Woen-Sik (Department of Physical Education, College of Education, Kyungpook National University)
  • 김동수 (경북대학교 대학원 체육학과) ;
  • 채원식 (경북대학교 사범대학 체육교육과)
  • Received : 2012.04.30
  • Accepted : 2012.06.11
  • Published : 2012.06.30
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Abstract

The purpose of this study was to determine how smartphone use posture affects biomechanical variables and muscle activities. Eleven university students(age: $22.2{\pm}2.6$ yrs, height: $176.6{\pm}4.7$ cm, weight: $69.5{\pm}7.5$ kg) who have no musculoskeletal disorder were recruited as the subject according to having experience in using the smartphone for more than one year. Angular velocity, muscle activity, and thumb finger pressure were determined for each trial. For each dependent variable, a one-way analysis of variance (ANOVA) with repeated measures was performed to test if significant difference existed among different three conditions (p<.05). The result showed that rotational angular velocity of the first metacarpal were increased in DESK posture compared with STAND posture during SU phase. The average nEMG values of FDI(First dorsal interosseous) were less in SIT and DESK posture compared with STAND posture during SR phase. These indicated that smartphone postures may effect the thumb ROM(Range of motion) and muscle activity. This has led to suggestions of the need for further kinetic and EMG analyses to evaluate best assess and characterize with smartphone use.

Keywords

Acknowledgement

Supported by : 한국연구재단

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