The Effects of Differential Psychological Stress on Plasma Cholesterol Levels in Rats

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Abstract
The plasma cholesterol concentrations of rats receiving either lever-press escape or avoidance training, exposure to unpredictable, uncontrollable grid shocks using a yoked procedure, or no shocks, were compared in 2 experiments (exp). All were fed a cholesterol-supplemented diet prior to and during the 30 days of exposure to these differing stress treatments. The results of both exp showed that yoked groups had higher terminal levels of cholesterol than their experimental counterparts in the escape or avoidance groups even though they received the same amounts of aversive stimulation and ate the same amounts of the diet. Both were higher than the nonshocked groups when the amount of food intake for all was matched in exp 2. The type of level-press training had no effect.

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