Primary Aim: To test the acute effects of olanzapine or ziprasidone administration, in comparison to placebo, on insulin sensitivity in antipsychotic-naïve healthy young men, measured as whole-body dextrose infusion rates (mg/kg/min), hepatic glucose production (glucose rate of appearance \[Ra\]), primarily muscle glucose utilization (glucose rate of disappearance \[Rd\]), and adipose tissue related free fatty acid production (glycerol rate of appearance \[Ra\]). We hypothesize that olanzapine, but not ziprasidone, will result in acute decreases in insulin sensitivity. Secondary Aim: To test the acute effects of olanzapine or ziprasidone on insulin signaling pathways in antipsychotic naïve healthy young men. We hypothesize that olanzapine, but not ziprasidone, will result in acute alterations in insulin signaling.
See brief description
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
SINGLE
Enrollment
46
olanzapine/Zyprexa
ziprasidone/Geodon
Washington University School of Medicine
St Louis, Missouri, United States
Whole Body Insulin Sensitivity
To evaluate, using a within-subject placebo-controlled comparison, the acute effects of olanzapine or ziprasidone administration on insulin sensitivity in antipsychotic-naïve healthy young men, measured as whole-body dextrose infusion rates (mg/kg/min).
Time frame: approximately 3 hours
Hepatic Insulin Sensitivity
To evaluate, using a within-subject placebo-controlled comparison, the acute effects of olanzapine or ziprasidone administration on insulin sensitivity in antipsychotic-naïve healthy young men, measured as hepatic glucose production (glucose rate of appearance \[Ra\]).
Time frame: approximately 3 hours
Peripheral Insulin Sensitivity
To evaluate, using a within-subject placebo-controlled comparison, the acute effects of olanzapine or ziprasidone administration on insulin sensitivity in antipsychotic-naïve healthy young men, measured as primarily muscle glucose utilization (glucose rate of disappearance \[Rd\]).
Time frame: approximately 3 hours
Adipose Tissue Insulin Sensitivity
To evaluate, using a within-subject placebo-controlled comparison, the acute effects of olanzapine or ziprasidone administration on insulin sensitivity in antipsychotic-naïve healthy young men, measured as free fatty acid release (glycerol rate of appearance \[Ra\]).
Time frame: approximately 3 hours
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