| Summary: | 碩士 === 國立清華大學 === 工業工程與工程管理學系 === 95 === With the rapid development in information technology, the application of virtual reality becomes broader and more promising. By using virtual reality, it can easily simulate human tasks in virtual environment for medical rehabilitation, games, or professional training.
There are many different types of display techniques for virtual reality which may bring different perception to people. The primary purpose of this study was to examine the differences in gait parameters and subjective responses in different VR visual environment. The study was divided into two experiments: ground walking and treadmill walking. Twenty healthy adults participated the experiments. In ground walking experiment, subjects walked on a treadmill under three conditions (Non-VR, with Mono HMD, and Stereo HMD). As for treadmill walking experiment, subjects walked on a treadmill under four conditions (Non-VR, with Mono HMD, Stereo HMD, and Stereo Projector) at two walking speed, i.e. 3.2 and 4.7 km/hr. Response measures included joint range of motion in lower extremity and ground reaction force, and subjective motion sickness in virtual environment measured by the Simulator Sickness Questionnaire (SSQ).
From the results of the above two experiments, we found that the influence of VR visual environment has significant effect on the joint motion of knee and SSQ scores. The motion of knee and SSQ scores in VR environment (Mono HMD, Stereo HMD, or Stereo Projector) was found to be greater than that in Non-VR environments. In treadmill walking experiment, the influence of speed was greater than that of gender and VR visual display environment. At the speed of 4.7 km/hr, a shorter gait cycle and a larger motion in hip and knee joints was found.
Further the research found that VR environment had significant influence on the gait stability of the users. We should notice that the user’s motion sickness issue while applying VR equipment.
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