Muscle Fibres + Contractions (MS)

Question 1

What are the 3 muscle fibres?

Answer 1

Slow-Twitch
Fast moderate-Twitch
Fast-Twitch

Question 2

State the 5 slow-twitch muscle characteristics (Type I)

Answer 2

Slow to fatigue
Low amount of force
Small in muscle size
Red in colour
5k, 10k, Marathon

Question 3

Fast moderate-Twitch characteristics (Type IIa)

Answer 3

Moderate to fatigue
Moderate amount of force
Moderate in muscle size & Red in colour
Jogging, swimming

Question 4

State the 5 fast-twitch characteristics (Type IIx)

Answer 4

Quick to fatigue
High amount of force
Large in muscle size
White in colour
100m Sprint, Weight Lifting

Question 5

What is a ‘concentric’ contraction?

Answer 5

Muscles that shorten in an exercise e.g. bicep curl. The bicep is concentric (upward phase)

Question 6

What is a ‘eccentric’ contraction?

Answer 6

Muscles that lengthen during an exercise e.g. bicep curl. The tricep is eccentric (upward phase)

Question 7

What is a ‘isometric’ contraction?

Answer 7

Muscles that don’t shorten or lengthen during an exercise but the muscles are all still working hard e.g. a plank.