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Related Concept Videos

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...
Drug Dosing: Geriatric Patients01:15

Drug Dosing: Geriatric Patients

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...
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

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...
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...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are not...

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Related Experiment Video

Updated: May 18, 2026

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
12:59

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Published on: July 5, 2017

Physiologic complexity and aging: implications for physical function and rehabilitation.

Brad Manor1, Lewis A Lipsitz

  • 1Division of Gerontology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA. bmanor@bidmc.harvard.edu

Progress in Neuro-Psychopharmacology & Biological Psychiatry
|September 19, 2012
PubMed
Summary
This summary is machine-generated.

Aging leads to a loss of physiological complexity, diminishing adaptive responses and causing functional decline. Rehabilitative interventions should target these complex dynamics to restore healthy function.

Keywords:
BOLDCardiovascularComplexityMEGMRIMSEMultiscale entropyNonlinearPostural controlblood-oxygen level dependentmagnetic resonance imagingmagnetoencephalographymulti-scale entropy

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Assessment of Dependence in Activities of Daily Living Among Older Patients in an Acute Care Unit
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Published on: September 30, 2020

Related Experiment Videos

Last Updated: May 18, 2026

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
12:59

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Published on: July 5, 2017

Assessment of Dependence in Activities of Daily Living Among Older Patients in an Acute Care Unit
06:52

Assessment of Dependence in Activities of Daily Living Among Older Patients in an Acute Care Unit

Published on: September 30, 2020

Area of Science:

  • Physiology
  • Complex Systems Theory
  • Gerontology

Background:

  • Healthy physiological processes exhibit complex dynamics across multiple scales.
  • Aging is associated with a progressive loss of physiological complexity.
  • This loss of complexity may underlie functional decline and reduced adaptability.

Purpose of the Study:

  • To explore the relationship between physiological complexity and functional decline in aging.
  • To review evidence on how interventions can restore physiological complexity.
  • To discuss implications for optimizing rehabilitative strategies.

Main Methods:

  • Review of existing literature on physiological complexity and aging.
  • Analysis of the link between complexity, functionality, and adaptability.
  • Examination of complex systems theory tools for quantifying physiological dynamics.

Main Results:

  • Loss of physiological complexity correlates with reduced functional capacity.
  • Reduced complexity limits the organism's adaptive responses to stressors.
  • Interventions targeting complex dynamics show potential for restoring function.

Conclusions:

  • Restoring physiological complexity is a promising approach for rehabilitation in aging.
  • Complex systems theory offers valuable tools for assessing and guiding interventions.
  • Understanding and targeting physiological complexity can improve health outcomes.