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Bones: Round 2. Andrew Richards & Ryan Swenson. Peak Functional Levels. Quantity of bone increases through life until skeletal maturity – Age 20-30 Peak Bone Mass is reached at this point “Bone Bank” used for remainder of life Growth rates differ at different sites

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bones round 2

Bones: Round 2

Andrew Richards & Ryan Swenson

peak functional levels
Peak Functional Levels
  • Quantity of bone increases through life until skeletal maturity – Age 20-30
  • Peak Bone Mass is reached at this point
    • “Bone Bank” used for remainder of life
    • Growth rates differ at different sites
  • Most rapid growth during adolescence
    • About 25% of PBM achieved during

adolescent growth spurt

peak functional levels1
Peak Functional Levels
  • Factors
    • Gender:
      • Men larger skeletons than women= larger “bank”
      • Women reach their peak sooner
        • Have lower BMD
    • Hereditary:
      • ¾ of skeletal characteristics
    • Environmental Factors
      • Strain placed on skeleton (Wolff’s Law)
      • Activities such as smoking can negatively impact
increasing decreasing levels
Increasing/Decreasing Levels
  • Occurs during the process of bone remodeling along with natural growth
    • Resorption, reversal, and formation
    • Osteoclasts, osteoblasts, osteocytes, etc.
increasing decreasing levels1
Increasing/Decreasing Levels
  • Remodeling process based off Wolff’s Law
    • Julius Wolff: German anatomist and surgeon
  • States that bone in a healthy person will adapt to the loads to which it is placed
    • Heavy Loads=increased levels
    • Long Term Immobilized=decreased levels
dysfunctional levels
Dysfunctional Levels
  • As body ages bone levels decrease
  • Additionally, factors can increase the rate
dysfunctional levels1
Dysfunctional Levels
  • Osteopenia: low bone mass
    • Occurs naturally to some degree with aging
    • Women lose roughly 8% per decade
    • Men lose roughly 3% per decade
dysfunctional levels2
Dysfunctional Levels
  • Osteoporosis: Decreased bone strength compromising normal function, predisposing to an increased risk of fracture
    • Change in structure of trabecular bone
    • Relationship to common fracture sites
      • Spine, wrists, and hips
references
References

http://www.ncsf.org/pdf/ceu/establishing-peak-bone-mass.pdf

http://www.ncbi.nlm.nih.gov/books/NBK45504/

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