Body posture as an indicator of workload in mental work.
OBJECTIVE
For this article, the relationships between body posture and workload for four mental tasks simulated on a computer were studied.


BACKGROUND
Human behaviors are observable during work and are related to human mental activities. A novel supplementary method, based on human behavior but not directly related to task execution, is proposed to assess the workload in mental work situations.


METHODS
Body posture was quantitatively analyzed with the use of a video-based analysis system. The distance between a participant's head and the display, the distance between the shoulder and the hip, and the trunk angle of the shoulder and the hip with respect to the gravitational field were calculated.


RESULTS
The various tasks affected the distance between the head and the display (p < .001) and the trunk angle (p < .001).The distance between the head and the display decreased with increasing workload (p = .007).


CONCLUSIONS
These results indicate that body posture can be used as an indicator for overall workload assessment.


CONCLUSIONS
The proposed method of workload may be useful for real-time observations or the monitoring of mental states in mental work environments (e.g., rail traffic dispatching, air traffic control).
School of Mechatronics Engineering, University of Electronic Science and Technology, No. 2006, Xiyuan Ave., West Hi-Tech Zone, Chengdu 611731, Sichuan, China. qiujing@uestc.eud.cn
Jing
J
Qiu
Rolf
R
Helbig
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D011187:Posture; D013647:Task Performance and Analysis; D013850:Thinking; D014743:Videotape Recording; D016526:Workload; D055815:Young Adult