Effects of the Trunk Rising Angle on Pressure Sensation and Postural Stability During Sitting at a Desk with a Prone Posture

Abstract

This study was aimed at investigating the effects of the trunk rising angle on pressure sensation and subjective postural stability when sitting at a desk with the prone posture, such as for napping during office or school hours. Eighteen healthy young adults took a 15-min prone posture at a desk using a support base at a tilt angle of 60°, 45°, or 30° to adjust the trunk rising angle （angle between the trunk and the horizontal plane） or without a base （control condition）. Satisfaction was significantly higher under all support base conditions than under the control condition. In addition, the 60° condition showed the largest trunk rising angle and significantly lesser pressure sensation and higher subjective postural stability compared to the control condition. These results suggest that, when napping with the prone posture at a desk, a moderate trunk rising angle is recommended based on body pressure and postural stability, and a pillow or other nap accessory that enables this posture may be used.