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Related Concept Videos

Bone Remodeling01:40

Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Bone Disorders01:29

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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.
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Changes in the Appendicular Skeleton with Age01:09

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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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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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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Bone as Supporting Connective Tissue01:23

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Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
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Related Experiment Video

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Author Spotlight: Enhancing Small Animal Bone Compression Testing for Research
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Aging and Mechanoadaptive Responsiveness of Bone.

Behzad Javaheri1, Andrew A Pitsillides2

  • 1Skeletal Biology Group, Comparative Biomedical Sciences, The Royal Veterinary College, Royal College Street, London, NW1 0TU, UK.

Current Osteoporosis Reports
|November 25, 2019
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Osteoporosis involves age-related bone loss. Recent studies show novel exercise can restore bone health by improving mechanoadaptation, making lower-intensity activities more effective for older adults.

Keywords:
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Area of Science:

  • Gerontology
  • Bone Biology
  • Exercise Physiology

Background:

  • Osteoporosis is an age-related condition featuring bone loss and increased fracture risk.
  • The exact causes, whether reduced physical activity or cellular changes in the elderly, remain unclear.
  • Osteoporosis is considered evidence of impaired mechanoadaptation in aging bone.

Purpose of the Study:

  • To review recent advances in understanding and addressing impaired bone mechanoadaptation in the aged.
  • To explore how novel loading interventions can restore bone health in elderly individuals.
  • To identify potential mechanisms for developing new pharmacological interventions.

Main Methods:

  • Review of recent high-impact loading studies.
  • Analysis of innovative exercise paradigms.
  • Investigation into the mechanisms of bone mechanoadaptation.

Main Results:

  • Innovative loading regimes can prime mechanoadaptation in aged bone, making low-to-moderate intensity loading beneficial.
  • Aged bone mechanoadaptation appears sensitive to high strain gradients, not just strain magnitude.
  • Novel interventions can restore mechanoadaptive capacity, offering new strategies for bone health in the elderly.

Conclusions:

  • Impaired mechanoadaptation is characteristic of the aging skeleton.
  • Novel exercise paradigms can enhance osteogenic signaling, potentially making moderate activities more effective.
  • Understanding these mechanisms may lead to new pharmacological treatments for age-related bone loss.