Virtual reality (VR) paradigms have proved to be a valid method to challenge and perturb balance. There is little consensus in the literature on the best protocol design to perturb balance and induce postural sway. Current VR interventions still lack a well-defined standardized metric to generate a virtual environment that can perturb balance in an efficacious, lifelike, and repeatable manner. The objective of this study was to investigate different configurations of amplitude and frequency in an anterior–posterior translation VR environment, that is, lifelike and scaled. Thirteen young adults with no conditions affecting balance were recruited. Balance was challenged by anterior–posterior sinusoidal movement of the lab image within the VR headset. Four different amplitudes of the sinusoidal movement were tested: 1, 5, 10, and 20 cm, with each amplitude being presented at 2 test frequencies : 0.5 and 0.25 Hz. Mean center of pressure velocity was significantly greater than baseline at 0.5 Hz and amplitudes of 10 and 20 cm. Mean center of pressure at approximate entropy was greater than baseline at 0.5 Hz and amplitude of 20 cm. The results suggest that sinusoidal movement of a realistic VR environment produces altered balance compared with baseline quiet standing, but only under specific movement parameters.

虚拟现实（VR）范式已被证明是挑战和扰乱平衡的有效方法。对于扰乱平衡和引起姿势摇摆的最佳方案设计，文献中几乎没有达成共识。当前的 VR 干预措施仍然缺乏明确定义的标准化指标来生成能够以有效、逼真且可重复的方式扰乱平衡的虚拟环境。本研究的目的是研究前后平移 VR 环境中振幅和频率的不同配置，即逼真且按比例缩放。招募了 13 名没有影响平衡状况的年轻人。VR 耳机内实验室图像的前后正弦运动对平衡提出了挑战。测试了四种不同的正弦运动幅度：1、5、10 和 20 厘米，每个幅度以 2 个测试频率呈现：0.5 和 0.25 Hz。平均压力中心速度在 0.5 Hz 和幅度 10 和 20 cm 时显着大于基线。近似熵的平均压力中心大于 0.5 Hz 和 20 cm 振幅的基线。结果表明，与基线安静站立相比，真实 VR 环境的正弦运动会产生平衡改变，但仅限于特定的运动参数。