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Related Experiment Videos

Methamphetamine effects on rat circadian clock depend on actograph.

S Honma1, K Honma, T Hiroshige

  • 1Department of Physiology, Hokkaido University School of Medicine, Sapporo, Japan.

Physiology & Behavior
|April 1, 1991
PubMed
Summary
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Chronic methamphetamine exposure alters rest-activity patterns in rats, affecting circadian rhythms differently based on measurement tools. The study highlights how actograph choice influences observed effects on biological rhythms.

Area of Science:

  • Chronobiology
  • Neuropharmacology
  • Animal Behavior

Background:

  • Circadian rhythms govern essential physiological processes.
  • Methamphetamine is known to affect behavior and physiological rhythms.
  • Understanding drug-induced alterations in circadian patterns is crucial.

Purpose of the Study:

  • To investigate the impact of chronic methamphetamine administration on the rest-activity rhythm in rats.
  • To compare the effects of methamphetamine using two distinct actigraphy methods: Animex and running-wheel.
  • To determine if methamphetamine alters the phase, period, or underlying oscillation of circadian rhythms.

Main Methods:

  • Twelve blinded rats received D-methamphetamine dissolved in drinking water chronically.
  • Rest-activity rhythms were monitored using two actigraphs: Animex and a running-wheel.

Related Experiment Videos

  • Activity data were analyzed for changes in rhythm expression, phase, period, and underlying oscillation.

    • Main Results:

    • Animex measurements showed enhanced activity and relative coordination but no change in phase or period.
    • Running-wheel measurements indicated a lengthening of the circadian period.
    • Methamphetamine modified circadian rhythm expression without affecting the underlying oscillation via Animex, but did affect it via running-wheel.

    Conclusions:

    • Chronic methamphetamine treatment affects circadian rhythm expression and underlying oscillations.
    • The observed effects of methamphetamine on circadian rhythms are dependent on the actigraphy method used.
    • This suggests that the choice of measurement tool is critical when assessing drug effects on biological clocks.