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Related Concept Videos

The Bone Matrix01:18

The Bone Matrix

Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in acid or...
Impact Loading01:19

Impact Loading

Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
Force Classification01:22

Force Classification

Forces play a crucial role in the study of physics and engineering. They are essential in describing the motion, behavior, and equilibrium of objects in the physical world. Forces can be classified based on their origin, type, and direction of action.
Contact and non-contact forces are two of the most widely used categories of forces. As the name suggests, contact forces require physical contact between two objects to act upon each other. Examples of contact forces include frictional,...
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.
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
Compact Bone01:27

Compact Bone

Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...

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Related Experiment Video

Updated: Jun 19, 2026

Tension-Free Weight-Bearing Model of Steroid-Induced Osteonecrosis of Femoral Head in Rats
05:55

Tension-Free Weight-Bearing Model of Steroid-Induced Osteonecrosis of Femoral Head in Rats

Published on: September 27, 2024

Muscle forces or gravity--what predominates mechanical loading on bone? Introduction.

Belinda R Beck1

  • 1School of Physiotherapy and Exercise Science, Griffith University Gold Coast Campus, Griffith University, Queensland, Australia. b.beck@griffith.edu.au

Medicine and Science in Sports and Exercise
|October 9, 2009
PubMed
Summary

This article discusses mechanical loading on bone, exploring whether muscle forces or gravity are predominant. It aims to stimulate new ideas for exercise prescription to improve bone health.

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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

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Related Experiment Videos

Last Updated: Jun 19, 2026

Tension-Free Weight-Bearing Model of Steroid-Induced Osteonecrosis of Femoral Head in Rats
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Tension-Free Weight-Bearing Model of Steroid-Induced Osteonecrosis of Femoral Head in Rats

Published on: September 27, 2024

Mouse Lumbar Vertebra Uniaxial Compression Testing with Embedding of the Loading Surface
07:52

Mouse Lumbar Vertebra Uniaxial Compression Testing with Embedding of the Loading Surface

Published on: December 1, 2023

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
09:32

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Published on: April 11, 2018

Area of Science:

  • Exercise Physiology
  • Bone Biology
  • Biomechanics

Background:

  • The American College of Sports Medicine symposium addressed the primary drivers of mechanical loading on bone.
  • Understanding these forces is crucial for optimizing exercise interventions.
  • This discussion is vital for advancing the field of bone health and exercise science.

Purpose of the Study:

  • To summarize the background, rationale, and significance of the symposium.
  • To present differing viewpoints on muscle forces versus gravity in bone loading.
  • To stimulate further research and discussion in exercise prescription for bone health.

Main Methods:

  • The article introduces papers from three speakers at the symposium.
  • It reflects the discussions and positions presented during the event.
  • No new experimental data was generated; it's a review and synthesis of expert opinions.

Main Results:

  • The symposium highlighted the ongoing debate regarding the predominant factor in mechanical loading on bone.
  • Different perspectives were presented on the roles of muscle-generated forces and gravitational forces.
  • The presented papers aim to inform and provoke thought on this topic.

Conclusions:

  • Reinvigorating the discussion on mechanical loading is essential for progress.
  • Stimulating new ideas can lead to improved exercise strategies for bone health.
  • Further research is needed to fully elucidate the interplay of forces affecting bone.