Burton R R
Human Effectiveness Directorate, Air Force Research Laboratory, Brooks AFB, TX, USA.
Aviat Space Environ Med. 2000 May;71(5):506-13.
The mathematical models developed in this article predict the following human G-level tolerances: 1) rapid onset relaxed (ROR); 2) gradual onset relaxed (GOR); and, 3) straining-rapid onset. Included in the model are specific functions of: 1) anti-G suit; 2) positive pressure breathing (PBG); 3) baroreceptor reflex; 4) handgrip reflex; 5) anti-G straining maneuver (AGSM) increasing intrathoracic pressures (Pi); 6) leg elevation; and, 7) reclining seatback angles < or = 55 degrees. These functions are based on sound physiologic principles. Also discussed in the development of this model, but not included in the models, were: 1) isometric muscle contraction reflex; 2) Qigong (Q-G) maneuver; and, 3) straining GOR tolerances. The straining GOR tolerance profile was calculated to be a measure of G-duration tolerance and not G-level tolerance. A maximum P of 125 mm Hg from the AGSM was used in these models that could be augmented with PBG to 185 mm Hg. G-level tolerance predictions using this model were validated with published data.
本文所开发的数学模型预测了以下人体G值耐受情况：1）快速 onset 放松（ROR）；2）逐渐 onset 放松（GOR）；以及3）用力 - 快速 onset。该模型纳入了以下特定功能：1）抗荷服；2）正压呼吸（PBG）；3）压力感受器反射；4）握力反射；5）抗荷用力动作（AGSM）增加胸内压（Pi）；6）腿部抬高；以及7）倾斜座椅靠背角度≤55度。这些功能基于合理的生理原理。在该模型的开发过程中还讨论了但未纳入模型的内容有：1）等长肌肉收缩反射；2）气功（Q - G）动作；以及3）用力GOR耐受情况。用力GOR耐受曲线经计算是G持续时间耐受的一种度量，而非G值耐受。这些模型采用了AGSM产生的最大125毫米汞柱的压力，可通过PBG增加至185毫米汞柱。使用该模型进行的G值耐受预测已通过已发表的数据得到验证。
