title: Electromyography comparison of normal chair-desk system and assistant chair-desk system on fatigue.
abstract: [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.
authors.affiliation: Division of Sports Science, College of Science and Technology, Konkuk University, Republic of Korea.
authors.forename: Moon-Seok
authors.initials: MS
authors.lastname: Kwon
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Sang-Ho
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Ik-Rae
authors.initials: IR
authors.lastname: Cho
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Yu-Mi
authors.initials: YM
authors.lastname: Won
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Mi-Kyung
authors.initials: MK
authors.lastname: Han
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Kon-Nym
authors.initials: KN
authors.lastname: Jung
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Jae-Hee
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Ji-Hyoung
authors.initials: JH
authors.lastname: Chin
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Jae-Hun
authors.initials: JH
authors.lastname: Rho
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Ju-Yeon
authors.initials: JY
authors.lastname: Kim
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Jae-Bong
authors.initials: JB
authors.lastname: Yang
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Jae-Kui
authors.initials: JK
authors.lastname: No
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Tae-Geun
authors.initials: TG
authors.lastname: Park
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Taek-Kyun
authors.initials: TK
authors.lastname: Lee
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Hyo-Joo
authors.initials: HJ
authors.lastname: Park
authors.affiliation: Department of Physical Education, College of Social Science, Tong Myong University, Republic of Korea.
authors.forename: Sam-Jun
authors.initials: SJ
authors.lastname: Lee
authors.affiliation: Department of Sports Science, College of Life Science and Nano Technology, Hannam University, Republic of Korea.
authors.forename: Kyoung-Seok
authors.initials: KS
authors.lastname: Yoo
authors.affiliation: Department of Exercise and Health Sciences, College of Natural Sciences, SangMyung University, Republic of Korea.
authors.forename: Suh-Jung
authors.initials: SJ
authors.lastname: Kang
authors.affiliation: College of Sports Science, Major of Recreation and Leisure Sports, Chung-Ang University, Republic of Korea.
authors.forename: Se-Jeong
authors.initials: SJ
authors.lastname: Kwon
authors.affiliation: College of Creative Future Talent, Daejin University, Republic of Korea.
authors.forename: Mi-Ae
authors.initials: MA
authors.lastname: Shin
authors.affiliation: College of Creative Future Talent, Daejin University, Republic of Korea.
authors.forename: Hu-Nyun
authors.initials: HN
authors.lastname: Kim
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Hyung-Sik
authors.initials: HS
authors.lastname: Kahn
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Min-Jung
authors.initials: MJ
authors.lastname: Kim
authors.affiliation: Department of Physical Education, College of Education, Hankun University of Foreign Studies, Republic of Korea.
authors.forename: Tae-Young
authors.initials: TY
authors.lastname: Kim
keywords: Chair-desk system; Fatigue; Posture