[Effect of clinostatic and anti-orthostatic hypokinesia on serum enzyme activity].

Seven-day exposure to clinostatic and antiorthostatic hypokinesia led to a significant decrease of Krebs cycle enxymes (malate dehydrogenase--MDH and isocitrate dehydrogenase) and creatine phosphokinase with no significant changes in lactate dehydrogenase (LDH), aspartate aminotransferase, alanine aminotransferase and MDH and LDH isoenzymes. This hypofermentemia returned to normal during 7-day readaptation. It was not associated with hemodynamic changes or emotional stress. The hypofermentemia was adaptive and induced by diminished motor activity.