한국운동역학회지 (Korean Journal of Applied Biomechanics)

  • 제24권3호
  • /
  • Pages.301-308
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  • 2014
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  • 1226-2226(pISSN)
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  • 2093-9752(eISSN)
한국운동역학회 (Korean Society of Applied Biomechanics)
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휴대전화 파지방법이 엄지손가락의 운동학적 변인과 근활성도에 미치는 영향

The Effect of Smartphone Holding Techniques on Kinematic Variables and Muscle Activities in the Thumb during Tapping Numbers

  • 김동수 (경북대학교 대학원 체육학과) ;
  • 채원식 (경북대학교 사범대학 체육교육과) ;
  • 정재후 (경북대학교 대학원 체육학과) ;
  • 이행섭 (경북대학교 대학원 체육학과)
  • 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) ;
  • Jung, Jae-Hu (Department of Physical Education, Graduate School of Kyungpook National University) ;
  • Lee, Haeng-Seob (Department of Physical Education, Graduate School of Kyungpook National University)
  • 투고 : 2014.08.02
  • 심사 : 2014.09.16
  • 발행 : 2014.09.30
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초록

The purpose of this study was to determine whether there are significant differences in kinematic variables and muscle activities of the thumb between two smartphone holding techniques. Twelve right handed university students(age $25.4{\pm}3.9yrs$, height $176.2{\pm}5.1cm$, weight $75.8{\pm}11.4kg$, hand length $19.2{\pm}1.1cm$) who have no musculoskeletal disorder were recruited as the subjects and had experience in using a smartphone for more than one year. Maximum joint angle, angular velocity, muscular activities were determined for each trial. For each dependent variable, paired t-test was used to determine whether there were significant differences between one hand (OH) and two hands ([TH], ${\rho}$ <.05). The results of this study showed that there were no significant differences between OH and TH in the maximum joint angle of the thumb. The angular velocity of each joint was not statistically significant between OH and TH. The statistical analysis revealed that the main effect of the smartphone holding conditions was significant in the peak normalized muscular activities of FDI and APL. Although smartphone holding technique doesn't affect on mobility and movement of the thumb joint, it may affect on active degree of the thumb and the upper extremity in directly and indirectly.

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