목 굴곡 각도에 따른 스마트폰 사용이 목세움근과 위등세모근의 근피로도에 미치는 영향

Abstract

This study investigated the effect of smartphone use by smartphone users" various angles on neck fatigue after using smartphone. Fifteen participants playing the game tasks for 20 min and Neck muscle fatigue was measured by extension the neck for 30 seconds in a supine position before and after using the smartphone at various neck flexion angles. At each neck flexion angle, there was no difference in the degree of muscle fatigue of the Upper Trapezius(UT) when extension of the neck between groups and within the group at both before and after using the smartphone. In the Cervical Erector Spinae(CES), there was no difference in fatigue at each neck flexion angle, but the difference in muscle fatigue within the groups was confirmed that the left side had more muscle fatigue after using the smartphone than before using the smartphone at a 45° flexion angle. In conclusion, smartphone users should be instructed not to adopt a neck flexion angle of 45° during smartphone use, as there is a link between these neck flexion angle ranges and increased CES muscle fatigue. Practitioner summary: This study proved that we should try to avoid a 45° neck flexion angle when using a smartphone.