Circadian rhythms are biological and behavioral fluctuations occurring approximately every 24 hours, believed to be influenced by the natural light-dark cycle. These rhythms are essential for adapting to daily activities and significantly impact overall health. Disruptions in circadian rhythms can lead to severe health issues, including premature death and changes in brain function, metabolism, and behavior.
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With advancements in healthcare increasing life expectancy, the global aging population is straining healthcare systems and research. Aging affects circadian rhythms, often resulting in sleep disturbances and decreased synchronization with environmental light cues, which may negatively impact the health of older individuals.
The Research Topic comprises eight manuscripts that investigate the intersection of aging, sleep, circadian rhythms, and related physiological functions. Among these, four review articles consolidate current knowledge on circadian biology, sleep management, and therapeutic approaches. The complementary original research studies provide detailed insights into these themes.
Drǎgoi et al. stress the significance of melatonin regulation in circadian rhythms and suggest methods to enhance its effectiveness, including the concept of chrononutrition. This approach advocates for timed food intake and melatonin-rich diets to align circadian rhythms and potentially mitigate age-related health disorders.
Qu et al. conducted a structured scoping review that found both multi-sensory and single-sensory therapies can enhance sleep quality in various aspects such as latency and total sleep time. Liu et al. discuss how variances in chronotype affect cognitive function by influencing neuroinflammatory processes. Their findings indicate that understanding chronotype could help address disruptions in circadian rhythms during perioperative periods, potentially reducing postoperative cognitive dysfunction.
Su and Xiang propose aligning physical activity with an individual's chronotype to enhance circadian synchronization. They introduce the idea of “chrono-exercise,” promoting physical activity in tandem with circadian rhythms as a strategy to bolster muscular repair and counteract decline in older adults.
Original research by Zhào et al. links circadian rhythm disruptions with increased fall risk in older adults, particularly in low-visual conditions. Feeney et al. demonstrate that overexpression of CaMKIV, related to memory consolidation, enhanced sleep in older male mice, suggesting age and sex-specific regulation of sleep stages via CREB signaling pathways.
Furthermore, Fu et al. found age-dependent changes in cortical structure resulting from acute sleep deprivation, showing that older adults are more vulnerable to these impacts. Finally, Li et al. examined the effects of the Bushen Anzhi herbal treatment on age-related insomnia, revealing improvements in sleep quality and cognitive functions.
Collectively, these studies emphasize the critical role of circadian rhythms in aging, affecting sleep patterns, cognitive abilities, metabolism, and general health. They also suggest that age-related disruptions in circadian rhythms can be managed, advocating for integrative approaches that include chronobiology and tailored therapeutic strategies to promote healthy aging.