부산대학교 도서관

This study aimed to clarify whether garment pressure with an inner shirt affects autonomic nerve activity and improves posture. The participants were 16 male college students. Three conditions involved were wearing a control inner shirt or two types of inner shirt designed to improve posture—upper arm model and upper arm plus chest model. In Experiment 1, electrocardiograms were measured in a resting sitting position, and the heart rate variability coefficient, which reflects autonomic nervous system activity, was calculated. In Experiment 2, the alignment of the neck and muscle activity during a typing task were measured in the home position before and after the typing task, and in the sitting and standing positions after the typing task with and without holding a smartphone. The results of this study indicated no alterations in autonomic nerve activity due to garment pressure. Moreover, compared with the upper arm plus chest model, the upper arm undershirt model demonstrated immediate effectivity in improving the alignment around the neck.