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KMID : 0603920210290030101
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Journal of Korean Academy of Occupational Therapy
2021 Volume.29 No. 3 p.101 ~ p.111
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Development of Spine Curvature Responsive Chair Backrest and Verification of Its Effectiveness
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Kim Hee-Dong
Chung Hyun-Ae
Jang Yeon-Sik
Park Je-Mo
Son Young-Hyo
Lee Ji-Hun
Jwa Min-Tak
Park Jeom-Hee
Jung Hwa-Shik
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Abstract
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Objective: This study aimed at the development and validation of a spine curvature responsive chair backrest thathelps maintain the correct posture and relieve back fatigue by facilitating and enhancing the natural spine curve inresponse to the shape of the spine while the chair back embraces the user’s back when seated.
Methods: The spine curvature responsive backrest was designed to be attached to a general office chair. When theuser leans on his or her back, the back responds according to the user’s spine curvature such that the entire backis closely stuck to the backrest, thereby maintaining and improving the natural curve of the spine. Ten malecollege students were selected as the subjects, and the change in their spinal curvature was measured using amotion analyzer and an EMG.
Results: The results of a motion analyzer evaluation showed that the lordosis of the lumbar and the kyphosis of thethoracic vertebrae increased as the reclining angle increased to 125 degrees, starting from the backrest angle of105 degrees when using the developed backrest. As the results of the EMG evaluation, the post-medianfrequency was higher than the pre-median frequency at all backrest angles.
Conclusion: The spine curvature responsive backrest developed in this study helps to maintain a proper posturewhen seated, thereby relieving tension in the back muscles. It can be used as a chair for office workers andstudents who sit for a long period of time for reducing their back fatigue.
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KEYWORD
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Backrest, Chair, Maintain posture, Spine curvature, Back fatigue
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