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The Effect of Aging on Tissues

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...

Bone Disorders

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...

Cross-bridge Cycle

Cross-bridge Cycle

As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

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...

Disorders of the Skeletal Muscle

Disorders of the Skeletal Muscle

The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...

Muscle Recovery and Fatigue

Muscle Recovery and Fatigue

Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...

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Related Experiment Video

Updated: May 15, 2026

Preparation and Culture of Myogenic Precursor Cells/Primary Myoblasts from Skeletal Muscle of Adult and Aged Humans

Preparation and Culture of Myogenic Precursor Cells/Primary Myoblasts from Skeletal Muscle of Adult and Aged Humans

Published on: February 16, 2017

[Aging of muscle].

Kazuhiro Shigemoto¹, Taichi Fukunaga, Shyuuichi Mori

¹Tokyo Metropolitan Institute of Gerontology, Japan.

Clinical Calcium

|December 27, 2012

Summary

Sarcopenia research is accelerating, focusing on understanding its mechanisms and developing diagnostic and preventive strategies. This review details pathological changes in motor neurons, synapses, muscle fibers, and satellite cells linked to sarcopenia.

Area of Science:

Gerontology
Neuroscience
Muscle Biology

Context:

Sarcopenia, an age-related loss of muscle mass and function, is a growing concern in clinical and basic research.
Understanding sarcopenia's underlying mechanisms is crucial for developing effective interventions.

Purpose:

To review recent pathological findings related to sarcopenia.
To highlight key cellular and molecular changes associated with muscle decline.

Summary:

This review examines pathological features in motor neurons, neuromuscular junctions, muscle fibers, and satellite cells implicated in sarcopenia.
Recent scientific findings provide critical insights into the cellular basis of sarcopenia.

Impact:

Pathological evidence is essential for advancing sarcopenia research.

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Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles

Published on: November 1, 2012

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Last Updated: May 15, 2026

Preparation and Culture of Myogenic Precursor Cells/Primary Myoblasts from Skeletal Muscle of Adult and Aged Humans

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Published on: February 16, 2017

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

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Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles

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Published on: November 1, 2012

This review consolidates current knowledge, guiding future diagnostic and therapeutic development for sarcopenia.