Aerosp Med Hum Perform. 2021 Mar 1;92(3):172-181. doi: 10.3357/AMHP.5673.2021.
Mass, moment of inertia, and amplitude of neck motion were altered during a reciprocal scanning task to investigate how night vision goggles (NVGs) use mechanistically is associated with neck trouble among rotary-wing aircrew. There were 30 subjects measured while scanning between targets at 2 amplitudes (near and far) and under 4 head supported mass conditions (combinations of helmet, NVGs, and counterweights). Electromyography (EMG) was measured bilaterally from the sternocleidomastoid and upper neck extensors. Kinematics were measured from the trunk and head. Scanning between the far amplitude targets required higher peak angular accelerations (7% increase) and neck EMG (between 1.24.5% increase), lower muscle cocontraction ratios (6.7% decrease), and fewer gaps in EMG (up to a 59% decrease) relative to the near targets. Increasing the mass of the helmet had modest effects on neck EMG, while increasing the moment of inertia did not. Target amplitude, not head supported mass configuration, had a greater effect on exposure metrics. Use of NVGs restricts field-of-view, requiring an increased amplitude of neck movement. This may play an important role in understanding links between neck trouble and NVG use.
在一项往复扫描任务中，改变了质量、转动惯量和颈部运动幅度，以研究夜视镜（NVG）如何在机械上与旋翼机组人员的颈部问题有关。在 4 个头支撑质量条件（头盔、NVG 和配重的组合）下，对 30 名受试者在 2 个幅度（近和远）之间进行扫描时进行了测量。双侧从胸锁乳突肌和颈伸肌测量肌电图（EMG）。从躯干和头部测量运动学。与近目标相比，在远幅度目标之间扫描需要更高的峰值角加速度（增加 7%）和颈部 EMG（增加 1.24.5%）、更低的肌肉协同收缩比（减少 6.7%）和更少的 EMG 间隙（减少高达 59%）。增加头盔的质量对颈部 EMG 的影响不大，而增加转动惯量则没有影响。目标幅度而不是头部支撑质量配置对暴露度指标的影响更大。使用 NVG 限制了视野，需要增加颈部运动的幅度。这可能在理解颈部问题与 NVG 使用之间的联系方面发挥重要作用。
