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Related Concept Videos

Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
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Cognitive development continues throughout adulthood, undergoing significant shifts across early, middle, and late stages. Individual transition occurs from adolescent idealism to pragmatic and adaptable thinking in early adulthood. During this period, individuals learn to integrate personal beliefs with the recognition that other perspectives are equally valid. Exposure to the complexities of modern society, diverse experiences, and higher education contribute to this adaptive thought process,...
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Drug Dosing: Geriatric Patients01:15

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Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...
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Geriatric patients show significant variation in how their bodies process medications, which can change how effective and safe treatments are. The liver is the primary organ where drug metabolism occurs, involving two main types of chemical reactions: phase I and II. Phase I metabolism is driven by the cytochrome P450 enzyme system, which includes key types such as CYP3A, CYP2D6, and CYP2C9. Research indicates that while aging doesn't notably alter the levels or activity of these enzymes, it...
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Age-dependent Dynamics of Locomotion in Caenorhabditis elegans: A Lyapunov Exponent Analysis
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Complex systems dynamics in aging: new evidence, continuing questions.

Alan A Cohen1

  • 1PRIMUS Research Group, Department of Family Medicine, University of Sherbrooke, CHUS-Fleurimont, 3001 12e Avenue N, Sherbrooke, QC, J1H 5N4, Canada. alan.cohen@usherbrooke.ca.

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Summary
This summary is machine-generated.

Aging is linked to the breakdown of physiological systems that maintain balance. This breakdown, a key factor in aging, can be measured using biomarkers and studied through complex systems dynamics.

Keywords:
AgingEmergent propertyPhysiological dysregulationPrincipal components analysisStatistical distanceSystems biology

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Area of Science:

  • Gerontology
  • Systems Biology
  • Physiology

Background:

  • Aging is associated with complex physiological system dynamics.
  • Dysregulation of molecular regulatory networks is implicated in aging.
  • Homeostasis maintenance capacity declines with age.

Purpose of the Study:

  • To review evidence linking complex systems dynamics to aging.
  • To highlight the role of physiological dysregulation in aging.
  • To discuss emergent physiological processes in aging.

Main Methods:

  • Synthesis of recent research on aging and complex systems.
  • Analysis of physiological dysregulation as an emergent property.
  • Biomarker-based measurement of regulatory network capacity.

Main Results:

  • Clear evidence shows physiological dysregulation is an emergent property of regulatory networks and plays a key role in aging.
  • Biomarkers can simply measure this physiological dysregulation.
  • Emergent physiological processes, though not easily explained by metabolic pathways, are quantifiable and relevant to aging.

Conclusions:

  • Complex systems dynamics are crucial to understanding aging.
  • Future research must integrate multi-factorial theories, systems biology, bioinformatics, and network approaches.
  • Distinguishing and integrating aspects like robustness and loss of complexity is vital for future aging studies.