Can Hypoxic Conditioning Improve Bone Metabolism? A Systematic Review.

Area of Science:

• Bone Biology
• Physiology
• Hypoxia Research

Background:

• Hypoxia-inducible factor is crucial for bone formation and vascular coupling.
• Hypoxic conditioning is a potential non-pharmacological treatment for skeletal diseases.
• The precise effects of hypoxia on bone metabolism remain unclear.

Purpose of the Study:

• To review the impact of various hypoxia conditioning methods on bone metabolism.
• To synthesize findings from in vitro, animal, and human studies.

Main Methods:

• Systematic literature search of PubMed and Web of Science databases.
• Analysis of experimental studies on bone remodeling parameters under modified ambient oxygen.
• Inclusion of studies on cell models, animal models, and human subjects.

Main Results:

• Thirty-nine studies examined hypoxia effects on cell models (gene/protein expression, mineralization).
• Three animal studies investigated sustained or cyclic hypoxia.
• Ten human studies assessed hypoxia's impact on bone health and hormones.

Conclusions:

• Different hypoxia modes can yield varied effects on bone metabolism in vitro and in vivo.
• Optimal cyclical oxygen concentration and exposure time require further investigation.