A Comparison Study of Posture and Fatigue of Neck According to Monitor Types (Moving and Fixed Monitor) by Using Flexion Relaxation Phenomenon (FRP) and Craniovertebral Angle (CVA)

Abstract

This study quantified the neck posture and fatigue using the flexion relaxation phenomenon (FRP) and craniovertebral angle (CVA); further, it compared the difference between the level of fatigue and neck posture induced by two types of monitors (regular fixed monitor and moving monitor). Twenty-three male participants were classified into two groups—the low-flexion relaxation ratio (FRR) group and the normal-FRR group, depending on the FRR value. All participants performed a document task for 50 min using both types of monitors. It was found that the FRR values significantly decreased after the documentation task. The CVA analysis showed that the moving monitor’s frequency of forward head posture (FHP) was lower than that for the fixed monitor. Overall, the moving monitor worked better than the fixed monitor; this can be interpreted as proof that such monitors can reduce neck fatigue.

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“…CV-angle analysis demonstrated that frequency of FHP was lower in the moving monitor than that in the fixed monitor. Hence, it could be concluded that sustained gazing at a fixed monitor can induce FHP [54]. In the present study, the author did not enquire about myopia among participants; and individuals who wore glasses were asked to remove them prior to CVangle measuring.…”

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“…The processes of all participants were recorded on video so that the experimenter could review the results by assessing the video frames and double-checking the transfer time. In addition, the craniovertebral angle (CVA), an indicator used to measure the total forward curvature of the back, was estimated to analyze the participants’ postures ergonomically [ 44 , 45 ]. Before performing the RTT, the experimenter attached stickers to the three points, including the seventh cervical vertebra and tragus of the ear, to calculate the CVA.…”

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“…[6] The craniovertebral (CV) angle can be measured as an objective way to evaluate head posture. [7] The "CV angle" is the angle created when a line extending from the tragus of the ear intersects a horizontal line going through C7. [7] This technique can accurately evaluate normal head-neck posture in the sagittal plane.…”

“…[7] The "CV angle" is the angle created when a line extending from the tragus of the ear intersects a horizontal line going through C7. [7] This technique can accurately evaluate normal head-neck posture in the sagittal plane. There are several techniques for assessing posture, varying from manual methods like a goniometer, flexible ruler, and observational postural analysis by using the line of gravity to measurement through radiographic testing.…”