WEEK 5: MUSCLE STRENGTH AND LENGTH TESTING

Question 1

How does muscle CSA affect force production?

Answer 1

increased CSA increased force prod

Question 2

How does the arrangement of muscle fibres affect force production?

Answer 2

Increased pennation angles may increase the number of cross-bridge interactions

Question 3

How does fibre type distribution affect force production

Answer 3

Greater CSA of type II fibres

Question 4

How does fascile length affect force production?

Answer 4

Increased length in sprinters compared to endurance athletes

Question 5

How does tendon stiffness affect force production?

Answer 5

Tendon stiffness is strongly correlated with force production; returns elastic energy more effectively

Question 6

How does motor unit recruitment affect force production?

Answer 6

Humans are unable to activate all motor units

Upper limit of recruitment is approximately 85%

Question 7

How does rate coding affect force production?

Answer 7

Firing frequency

Plays a greater role in modulating force during fast contractions

Reduced in older individuals compared to young adults

Question 8

How does synchronization affect force production?

Answer 8

Timing of action potentials discharged by concurrently active motor units

Greater in strength athletes compared to untrained individuals

Question 9

How does motor unit size affect force production?

Answer 9

Small motor units innervate < 10 fibres
Large motor units innervate > 100 fibres

Question 10

How does antagonist coactivation affect force production?

Answer 10

Reduces force output, reciprocal inhibition