Week 3

Question 1

What happens to the sarcomere when there is to much overlap?

Answer 1

actin bumps into M line and becomes wavy. Myosin into the Z line

Question 2

What happens to the sarcomere length when there is less overlap

Answer 2

Less cross bridges. Can’t actively generate tension

Question 3

High levels of tension (force) stimulate what?

Answer 3

increased protein synthesis and muscle growth

Question 4

Peak torque is a result of what?

Answer 4

Force and moment arms

Question 5

How do you measure T-JA

Answer 5

Isometric dynamometer tests at a range of joint angles

- Slow isokinetic (constant velocity) dynamometer contractions through a large ROM

Question 6

How does a variable resistance machine work?

Answer 6

Variable radius cams alter the effort (Y) and resistance (X) arms and therefore the effective resistance against which the muscles must work

Question 7

What happens as a result of a muscle shortening

Answer 7

the cross bridges (x bridges) can’t attach as quickly
No/little attachment
Reduced stretch of X - bridges (S2 segment)

Question 8

What happens as a result of a muscle lengthening

Answer 8

• Series elastic elements such as s2 segments, stretch and generate tension
  
  • Titan acts as a spring and creates tension. And it gets stiffer as we lengthen