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Related Concept Videos

Bone Disorders01:29

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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...
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...
Menopause01:28

Menopause

Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
Cellular Adaptation I: Introduction and Atrophy01:23

Cellular Adaptation I: Introduction and Atrophy

Cells can adapt to environmental changes to maintain function and avoid injury, a process called cellular adaptation. Adapted cells exist in a reversible intermediate state with changes in size, number, phenotype, metabolism, or function. These responses help cells meet altered physiological or pathological demands; for example, enlargement of breast and uterine tissues during pregnancy. Early adaptations may enhance function, but persistent stress eventually causes tissue damage.Types of...
Overview of Protein Metabolism01:21

Overview of Protein Metabolism

Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...

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Related Experiment Video

Updated: May 11, 2026

Identifying Frailty Using Point-of-Care Ultrasonography: Image Acquisition and Assessment
04:00

Identifying Frailty Using Point-of-Care Ultrasonography: Image Acquisition and Assessment

Published on: July 26, 2024

Frailty, sarcopenia, and hormones.

John E Morley1, Theodore K Malmstrom

  • 1Division of Geriatric Medicine, Saint Louis University School of Medicine, St Louis, MO 63104, USA. morley@slu.edu

Endocrinology and Metabolism Clinics of North America
|May 25, 2013
PubMed
Summary

Frailty is a clinical syndrome linked to age-related hormonal changes causing sarcopenia. Treatments include exercise, supplements, and reducing medications, while some drugs show uncertain efficacy.

Area of Science:

  • Gerontology and clinical medicine, focusing on frailty syndrome.

Background:

  • Frailty is a definable clinical syndrome with a simple screening test.
  • Age-related hormonal changes significantly contribute to frailty by causing sarcopenia (reduced muscle mass and strength).

Purpose of the Study:

  • To review the current understanding and treatment strategies for frailty, particularly sarcopenia.

Main Methods:

  • Review of existing literature on frailty, sarcopenia, and related therapeutic agents.
  • Discussion of pharmacological interventions (Selective Androgen Receptor Molecules, ghrelin agonists, Activin Type IIB soluble receptors, Follistatin-like 3 mimetics) and non-pharmacological approaches.

Main Results:

  • Selective Androgen Receptor Molecules and ghrelin agonists show promise for treating sarcopenia.

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The Creation of a Rat Model for Osteosarcopenia via Ovariectomy
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The Creation of a Rat Model for Osteosarcopenia via Ovariectomy

Published on: February 21, 2025

Related Experiment Videos

Last Updated: May 11, 2026

Identifying Frailty Using Point-of-Care Ultrasonography: Image Acquisition and Assessment
04:00

Identifying Frailty Using Point-of-Care Ultrasonography: Image Acquisition and Assessment

Published on: July 26, 2024

The Creation of a Rat Model for Osteosarcopenia via Ovariectomy
03:52

The Creation of a Rat Model for Osteosarcopenia via Ovariectomy

Published on: February 21, 2025

  • The efficacy and safety of Activin Type IIB soluble receptors and Follistatin-like 3 mimetics are less certain due to potential side effects.
  • Conclusions:

    • Key treatments for frailty include resistance and aerobic exercise, vitamin D and protein supplementation, and polypharmacy reduction.
    • Further research is needed to clarify the role of certain novel therapeutic agents in frailty management.