Time-course variations in the accumulation of endogenous products of lipid peroxidation and the state of antioxidative enzymes--superoxide dismutase and catalase--in blood of men exposed to antiorthostatic hypokinesia (-4.5 degrees) for 120 days were investigated. It was found that bed rest led to stimulation of lipid peroxidation which was measured as increased concentrations of lipid hydroperoxides and final products of lipid peroxidation in blood. Vitamin E and drugs with a specific metabolic action produced a normalizing effect on the content of products of lipid oxidative destruction. Special exercise regimens had a similar but less significant effect.
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