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Interaction between hyperbaric air and d-amphetamine effects on performance

J R Thomas

    Psychopharmacology
    |July 9, 1976
    PubMed
    Summary
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    D-amphetamine increases response rates in rats, but hyperbaric air shifts this effect to lower doses. High doses under normal pressure cause declines, while hyperbaric conditions exacerbate this effect.

    Area of Science:

    • Behavioral pharmacology
    • Neuroscience
    • Physiology

    Background:

    • Progressive-ratio schedules are used to study motivation and drug effects.
    • D-amphetamine is a stimulant known to affect operant behavior.
    • Hyperbaric environments can alter physiological and behavioral responses.

    Purpose of the Study:

    • To investigate the dose-dependent effects of d-amphetamine on response rates in rats under normal and hyperbaric conditions.
    • To determine if hyperbaric air modifies the behavioral effects of d-amphetamine.

    Main Methods:

    • Rats were trained on a progressive-ratio schedule for food reinforcement.
    • D-amphetamine was administered at various doses (0.25-8.0 mg/kg).
    • Behavioral performance was assessed under normal atmospheric pressure and hyperbaric air (7.1 ATA).

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    Main Results:

    • D-amphetamine increased the number of reinforcements obtained up to 1.0-2.0 mg/kg, with higher doses causing a decline.
    • Under hyperbaric conditions, the dose-effect curve for d-amphetamine was shifted to lower doses.
    • Doses that produced maximal effects under normal pressure led to a decline in reinforcements under hyperbaric conditions.

    Conclusions:

    • Hyperbaric air alters the dose-response relationship of d-amphetamine in rats.
    • The stimulant effects of d-amphetamine are potentiated or shifted to lower doses in a hyperbaric environment.
    • These findings suggest complex interactions between stimulant drugs and altered atmospheric pressure on motivated behavior.