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J Phys Ther Sci. 2015 Oct;27(10):3171-5. doi: 10.1589/jpts.27.3171. Epub 2015 Oct 30.

Electromyography comparison of normal chair-desk system and assistant chair-desk system on fatigue.

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Division of Sports Science, College of Science and Technology, Konkuk University, Republic of Korea.
Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
Department of Physical Education, College of Social Science, Tong Myong University, Republic of Korea.
Department of Sports Science, College of Life Science and Nano Technology, Hannam University, Republic of Korea.
Department of Exercise and Health Sciences, College of Natural Sciences, SangMyung University, Republic of Korea.
College of Sports Science, Major of Recreation and Leisure Sports, Chung-Ang University, Republic of Korea.
College of Creative Future Talent, Daejin University, Republic of Korea.


[Purpose] This study was designed to test the effects of the Assistant Chair-Desk System (ACDS), which can reduce the forward tilt of the neck and trunk and the level of fatigue during long lasting study in the sitting position. [Subjects] Fourteen middle school students and 14 college students of mixed gender participated in this study. [Methods] Fatigue level, the trapezius muscle, and the forward tilt angle of the head and trunk as well as distance factors were assessed before after using a normal chair-desk system (NCDS) and the ACDS for 120 minutes. [Results] There was an interaction effect in the angle and length of the neck from the sitting posture changes after 2 hours of studying using the NCDS and ACDS. There were also significant differences in the fatigue levels, hip joint angles and the lengths from the head according to the main effects of the chair-systems. [Conclusion] The studying position while using the ACDS was determined to prevent significant fatigue levels of the muscle and body, provide support to the head, by limiting the forward movement of the neck, and prevent forward tilt of the neck and trunk, by enabling the target point and gaze to be closer to the horizontal direction.


Chair-desk system; Fatigue; Posture

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