Fig. 2.9. Nonmicrowave Effects of SPS on Space Workers 2.3.1 Weightlessness In previous space flights, a number of physiological and biochemical alterations were observed in the astronauts. The most important of these appear to be: • Anemia (reduced number of red cells), • Cellular immune system changes, • Plasma volume reduction (i.e., reduction in the fluid components of the blood), • Calcium loss from the bones, • Muscle tissue reduction, • Blood chemistry changes, • Vestibular problems (i.e., space motion sickness, dizziness, spatial disorientation, sensations of rotation), and • Fat loss (inadequate nutrition?).
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