这项研究的目的是确定在飞行中坐着睡眠期间驱动乘客下肢姿势变化的生物力学机制，以防止对乘客的身体健康产生负面影响。20名受试者参加了一项观察性研究和随后的实验，该实验涉及在经济舱飞机座椅上就座睡眠期间的疲劳发展和组织氧合变化。最常用的三种姿势，涉及腿部和大腿臀部区域的四个目标肌肉，在实验中采用以下措施进行选择和检查：肌肉肌电图，组织氧合,和身体接触压力分布。结果表明，通过三个位置-位置1（向前放置小腿）之间的交替，减轻了胫骨前和腓肠肌的疲劳以及内侧结节下方区域的压缩，位置2(中性放置柄)，和位置3（将柄向后放置）。这项研究揭示了在坐姿睡眠过程中下肢姿势移位的生物力学因素的机械性能，并为经济型飞机座椅提供了设计优化策略，以减少对乘客健康的负面影响。
The purpose of this study was to determine the biomechanical mechanisms driving passengers\' lower-limb postural shifts during seated sleep on a flight to prevent negative effects on passengers\' physical health. Twenty subjects participated in an observational study and a subsequent experiment on fatigue development and tissue oxygenation changes during seated sleep in an economy-class aircraft seat. Three of the most frequently used postures, which involved four targeted muscles of the legs and the thigh-buttock region, were selected and examined in the experiment with the following measures: muscle electromyogram, tissue oxygenation, and body contact pressure distribution. The results showed that the fatigue of the tibialis anterior and gastrocnemius and the compression of the region under the medial tuberosities were relieved by alternations among the three positions-position 1 (placing the shanks forwards), position 2 (placing the shanks neutrally), and position 3 (placing the shanks backwards). This research reveals the mechanical properties of the biomechanical factors functioning in lower-limb postural shifts during seated sleep and provides design optimization strategies for economy-class aircraft seats to reduce the negative effects on passenger health.
