Bed Rest

Question 1

VO2 Difference not due to:

Answer 1

RBC Loss

Question 2

Bed Rest Affects

3 systems

Answer 2

• muscular
• Skeletal
• Cardiovascular

Question 3

Quads have 2-fold greater ____ than hamstrings

Answer 3

Atrophy

Question 4

Effects of bed rest on skeletal system

Answer 4

-decr bone density due to increase Ca++ loss

Question 5

Loss of strength is greater in ____ than ________

Answer 5

Lower than upper extremities

Question 6

Cardiac output ____ while _____ increases

Answer 6

decreases

HR increases

Question 7

Mechanism for decreased stroke volume

Answer 7

• decreased venous return

- decreased cardiac filling

Question 8

Decreased venous return & cardiac filling are due to ____

Answer 8

• decr central venous pressure

- incr venous compliance

Question 9

Effects of bed rest on cardio system

Answer 9

• decr VO2 max
• decr cardiac output (incr HR, decr stroke vol)
• decr O2 delivery

Question 10

Muscles most affected by bed rest:

Answer 10

• Quads

- LE extensors

Question 11

____ in amount of neural activity required to ______, due to ______

Answer 11

• increase
• elicit same amount of force
• decreased motoneuron excitability and decr ability to recruit units

Question 12

cardiac output decreases because:

Answer 12

stroke volume decreases

Question 13

Effect of bed rest on muscles

Answer 13

• decreased cross sectional area
• decr strength
• decr electrical efficiency
• decr endurance
• structural changes

Question 14

3 Muscular Structural Changes

Answer 14

• myofibrillar protein disorganization
• cellular edema
• occasional mitochondria in extracellular space

Question 15

Muscle endurance ___ because ___________ & __________

Answer 15

• decr
• decr Mm oxidative enzymes
• decr in O2 delivery utilization

Question 16

VO2 Max decr due to:

Answer 16

• length of bed rest
• depends on prior fitness level
• decr cardiac output