lecture 13 - muscle performance

Question 1

What type of fibre are type 1 muscle fibres?

Answer 1

Slow oxidative fibres

Question 2

What are the features of type 1 muscle fibres?

Answer 2

Many mitochondria, lots of oxidative enzymes, rich blood supply

Question 3

What type of fibres are type IIB muscle fibres?

Answer 3

Glycolytic fibres

Question 4

What type of fibres are type IIA muscle fibres?

Answer 4

Intermediate fibres

Question 5

What is the velocity-load relationship?

Answer 5

It is slower to shorten a bigger load

Question 6

What are the effects of strength training on muscle fibres?

Answer 6

Increased actin and myosin, hypertrophy (increases fibre diameter)

Question 7

What are the effects of endurance training on muscle fibres?

Answer 7

Increased oxidative capacity:
Increased mitochondria, increased capillary supply, increased lipid storage

Question 8

What is a motor unit?

Answer 8

A single motor neurone and all of the muscle fibres that neurone innervates

Question 9

What are the 2 mechanisms for regulating motor units?

Answer 9

Modulating the rate/frequency of APs fired, regulating the number of motor units activated

Question 10

What is muscle tetanus?

Answer 10

Maximum obtainable force at a high stimulus frequency