Varlet Manuel, Bardy Benoît G, Chen Fu-Chen, Alcantara Cristina, Stoffregen Thomas A
Movement to Health Laboratory, EuroMov, Montpellier-1 University, Montpellier, France.
Exp Brain Res. 2015 May;233(5):1607-16. doi: 10.1007/s00221-015-4235-7. Epub 2015 Feb 26.
On land, body sway during stance becomes coupled with imposed oscillations of the illuminated environment or of the support surface. This coupling appears to have the function of stabilizing the body relative to the illuminated or inertial environment. In previous research, the stimulus has been limited to motion in a single axis. Little is known about our ability to couple postural activity with complex, multi-axis oscillations. On a ship at sea, we evaluated postural activity using measures of body movement, as such, and we separately evaluated a direct measure of coupling between body movement and ship motion. Participants were tested while facing fore-aft and athwartship. We compared postural activity between participants who had been seasick at the beginning of the voyage and those who had not. Coupling of postural activity with ship motion differed between body axes as a function of body orientation relative to the ship. In addition, coupling differed between participants who had been seasick at the beginning of the voyage and those who had not. We discuss the results in terms of implications for general theories of postural control, and for prediction of susceptibility to seasickness in individuals.
在陆地上，站立时身体的晃动会与光照环境或支撑面的施加振荡相互耦合。这种耦合似乎具有使身体相对于光照或惯性环境保持稳定的功能。在先前的研究中，刺激仅限于单轴运动。对于我们将姿势活动与复杂的多轴振荡相耦合的能力，人们了解甚少。在海上的一艘船上，我们使用身体运动测量方法评估姿势活动，同样地，我们还单独评估了身体运动与船舶运动之间耦合的直接测量值。参与者在面对船首-船尾和横向时接受测试。我们比较了航行开始时晕船的参与者和未晕船的参与者之间的姿势活动。姿势活动与船舶运动的耦合在不同身体轴之间因身体相对于船舶的方向而异。此外，航行开始时晕船的参与者和未晕船的参与者之间的耦合也有所不同。我们从姿势控制的一般理论以及个体晕船易感性预测的角度讨论了这些结果。
