  The augmented-reality head-mounted display (e.g., Microsoft HoloLens) is one
of the most innovative technologies in multimedia and human-computer
interaction in recent years. Despite the emerging research of its applications
on engineering, education, medicines, to name a few, its impact on users'
movement behavior is still underexplored. The movement behavior, especially for
office workers with sedentary lifestyles, is related to many chronic
conditions. Unlike the traditional screens, the augmented-reality head-mounted
display (AR-HMD) could enable mobile virtual screens, which might impact on
users' movement behavior. In this paper, we present our initial study to
explore the impact of AR-HMDs on users' movement behavior. We compared the
differences of macro-movements (e.g., sit-stand transitions) and
micro-movements (e.g., moving the head) between two experimental modes (i.e.,
spatial-mapping and tag-along) with a dedicated trivial quiz task using
HoloLens. The study reveals interesting findings: strong evidence supports that
participants had more head-movements in the tag-along mode where higher
simplicity and freedom of moving the virtual screen were given; body
position/direction changes show the same effect with moderate evidence, while
sit-stand transitions show no difference between the two modes with weak
evidence. Our results imply several design considerations and research
opportunities for future work on the ergonomics of AR-HMDs in the perspective
of health.
