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失重使航天员立位试验的适应能力降低，为提高人体的立位耐力，设计了反复的体位变换训练法，观察其对立位耐力的影响。受试者年龄为１９～２０岁的健康男性自愿者，分成Ａ组（５人）和Ｂ组（４人）。Ａ组每天进行２ｈ的体育训练，中等运动量，持续６周，同时进行反复的体位变换训练，每次２５～３０ｍｉｎ，每周４次，共２３次，Ｂ组则只进行体育训练。训练前后两组都进行立位试验。结果表明，只进行体育训练的Ｂ组的立位耐力没有明显的变化（Ｐ＞０．０５），而反复体位变换训练的Ａ组的立位耐力，有明显的提高（Ｐ＜０．０５）。训练后站立中Ａ组心血管系统的调节能力优于Ｂ组，很可能是由於反复的体位变换提高了心血管系统的反射性调节能力，从而提高了人体的立位耐力。
Weightlessness reduced the adaptability of the astronaut standing test, and in order to improve the body’s standing stamina, repeated training of body position changing was designed to observe its effect on standing stamina. Healthy male volunteers aged 19-20 years were divided into group A (5) and group B (4). Group A was given 2 hours of physical training and moderate exercise every day for 6 weeks. At the same time, repeated training of body position was performed for 25-30 minutes and 4 times a week for 23 times. Group B received only physical training. Before and after training, both groups were tested for standing position. The results showed that there was no significant change in stand-up endurance in group B (P> 0.05), but stand-up endurance in group A was significantly higher than that in group B (P <0.05) . After training, the standing ability of the cardiovascular system in group A was better than that in group B, which is likely to be due to repeated reflex changes in the cardiovascular system to improve the reflex regulation of the cardiovascular system, thereby improving the body’s standing position.