Muscle fibres

Question 1

What are muscle fibres?

Answer 1

Make up voluntary (skeletal) muscle; divided into type 1, type 2 a and type 2 x

Question 2

What are type 1 fibres?

Answer 2

Slow twitch muscle fibres; suited to low intensity work, E.g marathon running, as they can be used for a long period of time without fatiguing. E.g mo farah

Question 3

What are type 2 A fibres?

Answer 3

Fast twitch muscle fibres used in anaerobic work; can be improved through endurance training to increase resistance to fatigue. E.g usain bolt last 50m of a 200m race

Question 4

What are type 2 X fibres?

Answer 4

Fast twitch fibres used in anaerobic work and can generate much greater force than other fibre types, but fatigue quickly