Bed Rest Flashcards
VO2 Difference not due to:
RBC Loss
Bed Rest Affects
3 systems
- muscular
- Skeletal
- Cardiovascular
Quads have 2-fold greater ____ than hamstrings
Atrophy
Effects of bed rest on skeletal system
-decr bone density due to increase Ca++ loss
Loss of strength is greater in ____ than ________
Lower than upper extremities
Cardiac output ____ while _____ increases
decreases
HR increases
Mechanism for decreased stroke volume
- decreased venous return
- decreased cardiac filling
Decreased venous return & cardiac filling are due to ____
- decr central venous pressure
- incr venous compliance
Effects of bed rest on cardio system
- decr VO2 max
- decr cardiac output (incr HR, decr stroke vol)
- decr O2 delivery
Muscles most affected by bed rest:
- Quads
- LE extensors
____ in amount of neural activity required to ______, due to ______
- increase
- elicit same amount of force
- decreased motoneuron excitability and decr ability to recruit units
cardiac output decreases because:
stroke volume decreases
Effect of bed rest on muscles
- decreased cross sectional area
- decr strength
- decr electrical efficiency
- decr endurance
- structural changes
3 Muscular Structural Changes
- myofibrillar protein disorganization
- cellular edema
- occasional mitochondria in extracellular space
Muscle endurance ___ because ___________ & __________
- decr
- decr Mm oxidative enzymes
- decr in O2 delivery utilization
