Ch 21 Flashcards
1
Q
disuse atrophy
A
- lack of use / stimulation causes muscles to shrink (decrease in size)
*strength can decline 5% per day
common with aging
2
Q
describe muscles in microgravity
A
- diameter of myofibril decreases
- takes long to recover
- sarcomere stays the same
3
Q
@ age 40 how much muscle mass is lost each year / how can you improve
A
1-2%
resistance exercise can be useful
4
Q
if you increase the performance (short dash to marathon) what happens to the peak performance age
A
it moves to the right (gets older)
5
Q
hibernating animals
A
black bears
- lose about 25-30% muscle strength
- resist atrophy of locomotor muscles despite inactivity / not eating !!!
