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Related Experiment Videos

Hormonal rhythm and feeding behavior.

T Hiroshige

    Journal of the Autonomic Nervous System
    |May 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Feeding behavior significantly influences plasma corticosterone levels in rats, establishing a pre-feeding hormone peak under restricted schedules. This peak, driven by a damped oscillator, persists even after feeding restrictions cease.

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    Physiology & behavior·1989

    Area of Science:

    • Chronobiology
    • Neuroendocrinology
    • Behavioral Biology

    Background:

    • The basal 24-hour pattern of plasma corticosterone is crucial for physiological regulation.
    • Feeding behavior is known to interact with hormonal rhythms, but its precise role is complex.
    • Understanding these interactions is key to deciphering circadian rhythm regulation.

    Purpose of the Study:

    • To elucidate the role of feeding behavior in modulating the diurnal pattern of plasma corticosterone in rats.
    • To investigate the impact of restricted feeding schedules on the circadian rhythm of corticosterone.
    • To identify the underlying mechanisms driving feeding-induced hormonal changes.

    Main Methods:

    • Construction of an ethosecretogram to simultaneously measure locomotor activity and plasma corticosterone levels in conscious rats.

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  • Exposure of rats to various feeding regimens, with a focus on restricted daily feeding.
  • Analysis of hormonal patterns and activity rhythms to correlate feeding with corticosterone levels.

    • Main Results:

    • Feeding behavior was found to induce a significant elevation in plasma corticosterone levels.
    • Restricted daily feeding schedules led to the formation of a distinct pre-feeding hormone peak.
    • This pre-feeding peak persisted post-restriction and exhibited free-running behavior, suggesting an independent oscillator.

    Conclusions:

    • Feeding exerts a bidirectional influence on hormone levels and initiates an interval timer mechanism.
    • A damped oscillator, entrainable to feeding schedules, drives the pre-feeding hormone peak.
    • This feeding-entrainable oscillator appears to be loosely coupled to the non-entrainable circadian oscillator.