Plasma Testosterone of Rats Subjected to Immobilization Stress and/or HCG Administration

Abstract
The effect of immobilization stress (IMO) on the plasma testosterone level in rats has been investigated. Plasma testosterone was not changed after 10 or 20 min IMO for 3 consecutive days as compared to nonstressed animals and the 10-min trial was without effect even if it was applied daily for 42 days. Three days IMO for 60 min caused a significant hormone decrease, which was even more pronounced after 3 or 42 days IMO for 120 min. The administration of HCG to rats immobilized 3 days for 120 min resulted in the increase of testosterone, however, the final level was significantly lower in comparison to nonstressed controls.