How Stress Alters Opioid Drug Effects

"3.1mg oxycodone/70 kg body weight was administered as the main drug intervention.~Based on body weight, the study nurse/anesthetist adjusted the (unknown) content in two syringes by removing enough fluid to reach a volume that would result in a dose equivalent of 3.1mg/70kg (0,043 mg/ml pr kg) should the syringes contain oxycodone.~The first dose was administered 5 minutes after the state induction task. The second dose was adjusted according to the performance on the self-administration task (but maximum 100% of the first dose) and administered 45 later."

"Pure saline was administered as the placebo condition.~Based on body weight, the study nurse/anesthetist adjusted the (unknown) content in two syringes by removing enough fluid to reach a volume that would result in a dose equivalent of 3.1mg/70kg (0,043 mg/ml pr kg) should the syringes contain oxycodone.~The first dose was administered 5 minutes after the state induction task. The second dose was adjusted according to the performance on the self-administration task (but maximum 100% of the first dose) and administered 45 later."

"ReSST is an in-house hybrid online-lab implementation of two stress induction paradigms based on the Trier Social stress test (TSST) and Iowa Social Singing Stress Test (I-SSST).~The set-up was tailored to allow repeated stress induction without diminishing effects that allowed for an online experiment panel. Stress and control state inductions were administered every-other session. The singing version of the stress test was always administered last as it was deemed more stressful during piloting."

Two different control tasks matched to the stress conditions on key parameters outlined in the protocol.