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A positive correlation has been found between changes of blood pressure and sedation threshold in two autonomic tests. In the Cold Pressor test the blood pressure changes were measured following the immersion of the hand in water at + 4-5° C. and in the Mecholyl test following the subcutaneous injection of a parasympathomimetic drug (Mecholyl). Both tests were considered to demonstrate differences in individuals' autonomic lability.
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Davies et al. (1963) studied this question.
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