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Related Concept Videos

Aging01:26

Aging

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.
Cellular Clock Theory
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...
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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...
Chronic Inflammation: Introduction01:12

Chronic Inflammation: Introduction

Chronic inflammation is a prolonged, dysregulated immune response that persists for weeks to years when the inciting stimulus is difficult to eradicate or when self‑antigens drive ongoing reactivity. Morphologically, it is defined by mononuclear cell infiltration, progressive tissue destruction, and concurrent attempts at healing via angiogenesis and fibrosis. Compared with acute inflammation, edema is less prominent while cellular infiltration predominates; triggers include persistent...
Bias in Epidemiological Studies01:29

Bias in Epidemiological Studies

Biases can arise at various stages of research, from study design and data collection to analysis and interpretation. Recognizing and addressing these biases is essential to ensure the validity and reliability of epidemiological findings.Broadly speaking, biases in epidemiology fall into three main categories: selection bias, information bias, and confounding. A more detailed description of possible biases is:
Inflammation01:38

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Factors Affecting Illness01:18

Factors Affecting Illness

When a person's physical, emotional, intellectual, social development or spiritual functioning is compromised, this deviation from a healthy normal state is called illness. Illness creates stress that in turn harms individuals. Irritation, anger, denial, hopelessness, and fear are behavioral and emotional changes an individual experiences in the phases of illness. A variety of factors influence a person's health and well-being.
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Related Experiment Videos

Aging and inflammation in two epidemiological worlds.

Michael Gurven1, Hillard Kaplan, Jeffrey Winking

  • 1Department of Anthropology, University of California-Santa Barbara, USA.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|March 4, 2008
PubMed
Summary

Increased lifespan may be linked to reduced lifelong inflammation from infections. The Tsimane people show higher C-reactive protein (CRP) levels earlier in life compared to Americans, suggesting differing inflammation exposures.

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Area of Science:

  • Evolutionary biology
  • Human longevity
  • Inflammation research

Background:

  • Humans evolved with high infection rates, necessitating robust inflammatory responses for survival.
  • While crucial for acute threats, chronic inflammation is implicated in age-related diseases.
  • Increased global life spans may correlate with reduced lifetime infection and inflammation exposure.

Purpose of the Study:

  • To investigate the hypothesis that longer life spans are partly due to reduced lifetime exposure to infection and subsequent inflammation.
  • To compare inflammation markers, specifically C-reactive protein (CRP), between populations with distinct epidemiological environments.

Main Methods:

  • Comparative analysis of C-reactive protein (CRP) levels.
  • Study populations: the Tsimane of Bolivia and individuals in the United States.
  • Assessment of age-specific CRP prevalence across different life stages.

Main Results:

  • High CRP prevalence is significantly greater among the Tsimane population through middle age.
  • By age 35, Tsimane individuals have experienced more years with elevated CRP than Americans by age 55.
  • This indicates a differential lifetime exposure to inflammation between the two groups.

Conclusions:

  • Findings support the hypothesis linking reduced lifetime inflammation to increased longevity.
  • Further research is needed to confirm the relationship between infection, inflammation, and chronic diseases of aging.
  • Future studies should include age-specific atherosclerosis and cardiac function indicators in the Tsimane population.