UW-Madison KINES 100 - Bones (3 pages)

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Lecture number:
Lecture Note
University of Wisconsin, Madison
Kines 100 - Exercise, Nutrition, and Health
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Kines100 Exercise health nutrition Last Lecture Outline 1 Nutrition and heart disease Lecture 26 Current Lecture 1 Bone and the nutrients 2 Bone Health Bone and the Nutrients Bone is living tissue Remodeling osteoblasts build bone create matrix mineral Osteoclasts dissolves bone release minerals allows bone to reshape itself adapt to stresses heal injury allows bone to be a Ca reservoir Blood Ca is maintained 3 Decreased Ca intake will lead to low blood Ca Vit D acts on mucosa cells triggering a greater rate of absorption High Ca diet absorb less than a fourth of Ca Low Ca diet absorbs half Ca stimulates osteoclasts dissolves bone releases Ca into blood Net Effect increased Blood ca High absorption of Ca from gut High resorption of Ca from bone High Ca diet high blood Ca stimulates osteoblasts building bone takes up Ca from blood Blood Ca maintained at any cost to the bone high Ca diet bone formation low Ca diet release Ca from bone Negative Ca balance diuretics excessive intake of protein alcohol caffeine Fecal losses excess phosphorus smoking Osteoporosis Resorption is greater than formation makes bones porous and weak Contributors menopause estrogen protects bones Greater in women than in men Low vitamin D less efficient synthesis lower sun exposure Low Ca intake Prevention bone mass peaks at 35 Adequate diet Moderation in factors diuretics Weight bearing exercise not smoking Bone Health Does exercise delay the onset of osteoporosis Typical response to exercise maintain increase bone mineral density Weight bearing exercise most beneficial Methods of Study exercise or no exercise lack of stress on the body bed rest space travel results 1 loss in bone mineral density per day in non weight bearing conditions consider a person that breaks a hip takes away independence Seen in competitive Female athletes high level of PA Low levels of body fat undernourished consequence irregular menstrual cycles amenorhea early age onset of osteoporosis 35 Osteoarthritis classic age related disease prevalence of disease increase with each decade of life associated with wear and tear Process of OA repetitive impulse loading wear and tear breakdown of bone small microfraction remodeling phase stiffening decreased shock absorption leads to increased stress on articular cartilage eventual cartilage breakdown Joint degradation Candidates for OA overweight individuals collision sports Early competitive sport participation and OA Does running promote OA Yes bio mechanics are poor over extended life of shoes running on concrete surfaces preexisting injury No compares runners to swimmers slightly less OA increased blood flow to joints cartilage normally has little perfusion maintains integrity of synovial fluid

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