Evaluation of physical workload affected by mass and center of mass of head-mounted display

Abstract

A head-mounted display (HMD) with inappropriate mass and center of mass (COM) increases the physical workload of HMD users. The aim of this study was to investigate the effects of mass and COM of HMD on physical workload. Twelve subjects participated in this study. The mass and posteroanterior COM position were 0.8, 1.2, or 1.6 kg and -7.0, 0.0, or 7.0 cm, respectively. The subjects gazed at the target objects in four test postures: the neutral, look-up, body-bending, and look-down postures. The normalized joint torques for the neck and the lumbar region were calculated based on the measured segment angles. The results showed that the neck joint torque was significantly affected by mass and COM and it increased as the HMD mass increased for all test postures. The COM position that minimized the neck joint torque varied depending on the test postures, and the recommended ranges of COM were identified.

Impact of using immersive virtual reality over time and steps in the Timed Up and Go test in elderly people

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“…The real chair was placed at the same spot as the virtual train seat and the line on the ground replaced by a blue suitcase to turn around in front of it. The reason for using a bulky piece of luggage is due to the limited viewing angle of the HMD, so participants can see the demarcation without having to bend their head too much [20,25].…”

Augmented reality tools for sports education and training

“…Additionally, multiplayer and speed of movement should be adjusted according to the capabilities of the AR devices (Kegeleers et al, 2018). Finally, biomechanical constraints induced by the HMD on the player's neck have to be evaluated (Chihara & Seo, 2018;Cometti, Païzis, Casteleira, Pons, & Babault, 2018).…”

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