B4 & B5) Types of muscle contraction & fibre types

Question 1

Isotonic contraction

Answer 1

Muscles contract to create movement

Question 2

Concentric contraction

Answer 2

Muscle gets shorter and fatter (due to the fibres contracting)

Question 3

Eccentric contraction

Answer 3

Muscle gets longer and thinner (due to gravity)

Question 4

Isometric contraction

Answer 4

Muscle contracts with no resulting movement

Question 5

Fibre types- Type l

Answer 5

Slow twitch
Contract slowly
Less force
Aerobic activity- rich blood supply & many mitochondria
Low intensity, long duration sports

Question 6

Fibre types- Type lla

Answer 6

Fast twitch/ fast-oxidative fibre
Fast contracting
Contract with great force
Resistant to fatigue- less reliant on oxygen supply by the blood
Fatigues faster than slow twitch
Suited to speed strength & power activities

Question 7

Fibre types- Types llx

Answer 7

Super-fast twitch/ fast-glycolytic fibre
Contract rapidly
Large amounts of force
Fatigues more easily
Suited to anaerobic sports- depends entirely on aerobic respiration
High intensity, short duration activities