In human beings and animal models, cognitive performance is often impaired in natural and experimental situations where circadian rhythms are disrupted. This includes a general decline in cognitive ability and fragmentation of behavioural rhythms in the aging population of numerous species. There is some evidence that rhythm disruption may lead directly to cognitive impairment; however, this causal link has not been made for effects due to aging. We have tested this link by examining rhythms and performance on contextual conditioning with the conditioned place preference task, in elderly, age-matched hamsters. Young healthy hamsters developed a preference for a context that is paired with the opportunity to engage in wheel-running (experiment 1). Aged animals with consolidated locomotor rhythms developed similar degrees of preference, whereas the age-matched hamsters with fragmented rhythms did not (experiment 2). The degree of preference was also correlated with activity amplitude. These results support the notion that age-related rhythm fragmentation contributes to the age-related memory decline.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/s0166-4328(00)00145-5 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Adverse childhood experiences and diurnal cortisol pattern and heart rate variability in adults.
Psychoneuroendocrinology
January 2025
School of Sport, Exercise and Health Sciences, Loughborough University, United Kingdom.
Dysregulation of hypothalamic-pituitary-adrenal axis (HPA axis) and of the autonomic nervous system may link stress throughout the life course with poorer health. This study aims to investigate whether multiple adverse childhood experiences have a long-term impact on markers of these systems - cortisol secretion and heart rate variability - in adulthood. Data were from the Whitehall II cohort study.
View Article and Find Full Text PDFEmergent robust oscillatory dynamics in the interlocked feedback-feedforward loops.
IET Syst Biol
January 2025
Center for Computational Biology, Department of Computational Biology, IIIT-Delhi, New Delhi, India.
One of the challenges that beset modelling complex biological networks is to relate networks to function to dynamics. A further challenge is deciphering the cellular function and dynamics that can change drastically when the network edge is tinkered with by adding or removing it. To illustrate this, the authors took a well-studied three-variable Goodwin oscillatory motif with only a negative feedback loop.
View Article and Find Full Text PDFComprehensive Analysis Reveals the Potential Diagnostic Value of Biomarkers Associated With Aging and Circadian Rhythm in Knee Osteoarthritis.
Orthop Surg
January 2025
Department of Orthopedics, Tianjin Medical University General Hospital, International Science and Technology Cooperation Base of Spinal Cord Injury, Tianjin Key Laboratory of Spine and Spinal Cord, Tianjin, China.
Objective: Knee osteoarthritis (KOA) is characterized by structural changes. Aging is a major risk factor for KOA. Therefore, the objective of this study was to examine the role of genes related to aging and circadian rhythms in KOA.
View Article and Find Full Text PDFBimodal Patterns of Locomotor Activity and Sleep in : A Model for Their Simulation.
Nat Sci Sleep
January 2025
Department of Insect Genetics, Institute of Cytology and Genetics of the Siberian Branch, the Russian Academy of Sciences, Novosibirsk, 630090, Russia.
Purpose: Two previously proposed modelling approaches to explain the bimodal pattern of activity and/or sleep in are based on 1) the concept of morning and evening oscillators underlying the peaks of activity in the morning and evening, respectively, and 2) the concept of two cycles of buildup and decay of sleep pressure, gated only by the circadian oscillator. Previously, we simulated 24-h alertness-sleepiness curves in humans using a model postulating the circadian modulation of the buildup and decay phases of two (wake and sleep) homeostatic processes. Here, we tested whether a similar model could be applied to simulate the bimodal 24-h rhythm of fly locomotor activity and sleep.
View Article and Find Full Text PDFEffects of sex, mating status, and genetic background on circadian behavior in .
Front Neurosci
January 2025
Department of Neuroscience, Farber Institute for Neurosciences, Synaptic Biology Center, Thomas Jefferson University, Philadelphia, PA, United States.
Circadian rhythms play a crucial role in regulating behavior, physiology, and health. Sexual dimorphism, a widespread phenomenon across species, influences circadian behaviors. Additionally, post-mating physiological changes in females are known to modulate various behaviors, yet their effects on circadian rhythms remain underexplored.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!