Abstract
Animal studies in space or analogous environments have suggested that there may be problems in the reproductive sphere; such factors might limit mankind's ability to live and work for extended periods of time in microgravity or on non-terrestrial planetary surfaces. A review of reproductive functioning in animal species studied during space flight demonstrated that most species were affected significantly by the absence of gravity and/or the presence of radiation. These two factors induced alterations in normal reproductive functioning independently of, as well as in combination with, each other. Based on animal models, we have identified several potential problem areas regarding human reproductive physiology and functioning in the space environment. While there are no current space flight investigations, the animal studies suggest priorities for future research in human reproduction. Such studies will be critical for the successful colonization of the space frontier.
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