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Related Concept Videos

Blood and Nerve Supply to the Bones01:29

Blood and Nerve Supply to the Bones

Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Blood Flow01:29

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
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.
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...
Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...

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Related Experiment Video

Updated: May 25, 2026

Murine Hind Limb Long Bone Dissection and Bone Marrow Isolation
07:17

Murine Hind Limb Long Bone Dissection and Bone Marrow Isolation

Published on: April 14, 2016

Blood flow restriction: rationale for improving bone.

Jeremy P Loenneke1, Kaelin C Young, Christopher A Fahs

  • 1Neuromuscular Laboratory, University of Oklahoma, Norman, OK, USA. jploenneke@ou.edu

Medical Hypotheses
|February 7, 2012
PubMed
Summary

Blood flow restriction (BFR) with low-intensity exercise enhances muscle growth and strength. BFR may also benefit bone adaptation, a response not seen with low-load exercise to failure alone.

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Last Updated: May 25, 2026

Murine Hind Limb Long Bone Dissection and Bone Marrow Isolation
07:17

Murine Hind Limb Long Bone Dissection and Bone Marrow Isolation

Published on: April 14, 2016

Visualizing Angiogenesis by Multiphoton Microscopy In Vivo in Genetically Modified 3D-PLGA/nHAp Scaffold for Calvarial Critical Bone Defect Repair
09:34

Visualizing Angiogenesis by Multiphoton Microscopy In Vivo in Genetically Modified 3D-PLGA/nHAp Scaffold for Calvarial Critical Bone Defect Repair

Published on: September 7, 2017

Area of Science:

  • Exercise Physiology
  • Bone Biology
  • Sports Medicine

Background:

  • Low-intensity exercise with blood flow restriction (BFR) mimics high-intensity training for muscle hypertrophy and strength.
  • Low-intensity exercise to failure elicits similar muscle protein synthesis as high-intensity exercise, questioning BFR's necessity for muscle gains.

Purpose of the Study:

  • To discuss the mechanisms and benefits of BFR on bone adaptation.
  • To provide rationale why low-load resistance exercise to failure may not yield similar bone benefits as BFR.

Main Methods:

  • Review of existing studies on BFR and exercise.
  • Hypothesizing mechanisms of bone adaptation to BFR, focusing on intramedullary pressure and interstitial fluid flow.

Main Results:

  • Studies suggest BFR training may induce adaptations in both muscle and bone.
  • Bone adaptation to exercise was previously thought to require high intensity or impact.

Conclusions:

  • BFR may be a novel modality for inducing muscle and bone adaptations.
  • Increased intramedullary pressure and interstitial fluid flow due to venous occlusion are hypothesized mechanisms for bone response to BFR.
  • While low-load exercise to failure benefits muscle, BFR may be crucial for distinct bone responses.