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Transcript of BONES
Over time, all physical activity will cause arthritis and other joint problems
Links between joints
Sites for Attachment
The original DIY Repairmen: Your bones!
AKA: Cancellous or Trabecular
meshwork arrangement; Springy
intertwined with blood vessels
AKA Cortical or Dense
solid arrangement; solid
Contains OSTEONS (Haversian system)
prevents tissue death
blood transport through long bones
Joints: Types and Basics
The basis for movement
Named based on what soft tissue separating the joint from the bone:
Articular cartilage at joint
collagen fibers in a liquid matrix (80% water)
imagine: sponge full of water
draws water; cushion
knee, elbow, shoulder and ankle
Bones on either side of each joint
All joints are crossed by at least one skeletal muscle
Stabilized by these muscles as well as ligaments
Nerves provide feedback about joint position
The Joint as a Functional Unit of the Musculoskeletal System
Injury: functional impairment of joint and surrounding structures
The Big Picture
Types of Contractions
Ball and socket
Regardless of shape:
elongated and highly nucleated (fibers)
striated (thick and thin filaments)
is the structural and functional unit of muscle
"" of neuromuscular system: nerve+fibers it controls
fine movement vs gross movement
1. excitability in response to nerve stimulation
2. contractility in response to stimulation
3. conductivity (travels along fibers)
-active tissue (rather than resist applied forces it produces it)
when in doubt, look at the data:
1990- Dr. Panush: Does exercise cause arthritis? Long-term consequences of exercise on the musculoskeletal system.
"reasonable recreational exercise--carried out within limits of comfort, putting joints through normal motions, and without underlying joint abnormality--need not inevitably lead to joint injury, even over many years"
2008- 284 runners VS 156 non-runners.
21 year follow up: runners had better musculoskeletal stability and 39% lower mortality rate
...-2013- Physical activity can be used as a therapy for OA patients to improve bone and joint health and overall stability as well as quality of life. (this statement can be found in many peer reviewed journal articles).
to review more research see: google scholar, or library website. search: joints and physical activity or joint health