Hordinsky J R, Gebhardt U, Wegmann H M, Schäfer G
Aviat Space Environ Med. 1981 Jan;52(1):16-8.
Twelve men and 12 women were exposed to two types of short-duration (6 h) space flight entry simulation: bedrest (no head-down tilt) and water immersion (to the neck). Preceding and following the simulation, orthostatic tolerance testing using LBNP (Lower Body Negative Pressure) was performed. Male LBNP tolerance was greater than female LBNP tolerance at all four comparison points (pre- and post-bedrest, pre- and post-water immersion); whereas the short-duration bedrest reduces female LBNP tolerance about as effectively as water immersion, only water immersion leads to marked LBNP intolerance in the male subjects. If the water immersion model simulates zero G, loss of male and female orthostatic tolerance will be about equal after short-duration space flight. On the other hand, the bedrest simulation would indicate a greater loss of orthostatic tolerance for females.
12名男性和12名女性接受了两种短时长（6小时）的太空飞行入轨模拟：卧床休息（无头低位倾斜）和全身浸水（至颈部）。在模拟前后，使用下体负压（LBNP）进行了立位耐力测试。在所有四个比较点（卧床休息前后、全身浸水前后），男性的下体负压耐力均高于女性；短时长的卧床休息降低女性下体负压耐力的效果与全身浸水相当，但只有全身浸水会导致男性受试者出现明显的下体负压不耐受。如果全身浸水模型模拟零重力，那么在短时长太空飞行后，男性和女性立位耐力的丧失将大致相等。另一方面，卧床休息模拟则表明女性的立位耐力丧失更大。
