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Related Concept Videos

Bone Remodeling01:40

Bone Remodeling

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.
Fractures: Bone Repair01:27

Fractures: Bone Repair

Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the procedure...
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.
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...
Bone Remodeling and Repair01:31

Bone Remodeling and Repair

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 bone...

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Related Experiment Video

Updated: Jun 17, 2026

Exergaming in Older People Living with HIV Improves Balance, Mobility and Ameliorates Some Aspects of Frailty
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Movement Patterns in Older Adults Recovering From Hip Fracture.

Jules J M Kraaijkamp1,2, Marjon Stijntjes3,4, Jurriaan H De Groot3

  • 1Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, the Netherlands.

Journal of Aging and Physical Activity
|January 12, 2024
PubMed
Summary

Older adults recovering from hip fracture show very low physical activity and high sedentary behavior, averaging 11 hours daily. Principal component analysis identified three distinct movement pattern groups.

Keywords:
accelerometergeriatric rehabilitationsedentary behavior

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Area of Science:

  • Gerontology
  • Rehabilitation Medicine
  • Biomedical Engineering

Background:

  • Hip fractures are a significant health concern in older adults, often leading to reduced mobility and prolonged recovery.
  • Quantifying physical activity and sedentary behavior is crucial for understanding recovery trajectories and developing targeted interventions.

Purpose of the Study:

  • To quantify physical activity and sedentary behavior in older adults post-hip fracture surgery.
  • To identify distinct patient groups based on their movement patterns during recovery.

Main Methods:

  • A cross-sectional cohort study included older adults (≥70 years) three months after proximal femoral fracture surgery.
  • Accelerometers were used for 7-day physical activity and sedentary behavior monitoring.
  • Principal component analysis was employed to identify distinct movement patterns.

Main Results:

  • Participants exhibited very low levels of physical activity.
  • An average of 11 hours per day was spent in prolonged sedentary behavior across all participants.
  • Three distinct groups with significant differences in physical activity and sedentary behavior levels were identified.

Conclusions:

  • Older adults recovering from hip fractures demonstrate critically low physical activity and high sedentary behavior.
  • Movement pattern analysis reveals distinct subgroups, suggesting tailored rehabilitation approaches may be beneficial.
  • Further research should explore interventions to increase physical activity and reduce sedentary time in this population.