Dosel P, Hanousek J, Petricek J, Cettl L
Department of Flying Safety, Institute of Aviation Medicine, 160 60 Prague 6, Gen. Piky 1, Czech Republic.
J Gravit Physiol. 2007 Jul;14(1):P135-6.
The high level of the long lasting acceleration with both an extensive gradient of the acceleration onset and vector alterations belong to the flight specificity in a cockpit of agile aircraft with high manoeuvring capabilities. In these cases the so-called push-pull (PP) effect has its particular significance. This means the tolerance decrease to the plus gravitational acceleration turns up after an exposure to the microgravity on the acceleration level between zero and +0.8 Gz or after previous action of negative acceleration values. The resulting activation of the sympathicus during plus gravitational acceleration process is up to several seconds behind time and pilot's performance is reduced. At the same time both an impairment of the threshold of the vision failure and G-LOC occur. The gravitational acceleration fatigue effect escalates, too.
长时间持续加速的高水平，以及加速起始的广泛梯度和矢量变化，属于具有高机动能力的敏捷飞机驾驶舱内的飞行特性。在这些情况下，所谓的推挽（PP）效应具有特殊意义。这意味着在暴露于零至+0.8 Gz加速度水平的微重力环境后，或在先前经历负加速度值之后，对正重力加速度的耐受性会降低。在正重力加速度过程中，交感神经的激活会延迟多达数秒，飞行员的表现会下降。同时，视力丧失阈值和G-LOC都会受到损害。重力加速度疲劳效应也会加剧。
