stress Flashcards
low stress on epithelial tissue
decrease collagen, decrease collagen diameter, decrease strength and tissue
high stress on epithelial tissue
bed sores, lacerations
low stress on muscle
decrease contractile proteins, decrease fiber diameter, decrease peak tension and power
high stress on muscle
increased contractile proteins, increased fiber diameter, increased peak tension and power
low stress on neural tissue
change in rate of transmission
high stress on neural tissue
shear/compression leads to degeneration, demyelinization, neurotinesis
5 tissue responses to physical stress
- decreased stress tolerance
- maintenance
- increased stress tolerance
- injury
- death
3 factors of physical stress
time, magnitude, duration
function of inflammation post injury
renders the injured tissue less tolerant of stress than it was prior to injury
low stress on bone
decrease mineral density (osteoporosis)
decreased strength
high stress on bone
increased bone mineral density, increased strength
excessive stress on bone
fracture
low stress on tendon
decreased cross sectional area, decreased stiffness and strength
high stress on tendon
increased cross sectional area, stiffness, strength
excessive stress on tendon
tendon strain
low stress level on ligament
decreased cross sectional area, decreased stiffness, strength
high stress level on ligament
increased cross sectional area, stiffness, strength
excessive stress on ligament
sprain, rupture
low stress level on cartilage
decreased PG content, decreased cartilage thickness and stiffness
high stress on cartilage
increased PG, increased cartilage thickness, stiffness
excessive stress on cartilage
degeneration or tear
factors that affect level of physical stress
- movement and alignment
- extrinsic factors
- psycho-social factors
- physiological factors
movement and alignment
muscle performance motor control posture and alignment physical activity occupational, leisure and self-care activities
extrinsic factors
orthotic devices, taping, assistive devices footwear ergonomic environment modalities gravity
psycho-social factors
influence the threshold values for tissue adaptation and injury
affect of injury on their life, levels on emotional stress
physiological factors
medications, system pathology, age, obesity
