Muscle Fibre Types

Question 1

What are slow oxidative muscle fibre types?

Answer 1

Designed for aerobic exercise and use oxygen to produce small amount of tension over long period of time as they’re resistant to fatigue. Store oxygen in myoglobin which is processed in mitochondria. Good for long distance events.

Question 2

What is the structure of slow oxidative muscle fibre types?

Answer 2

Small fibre size and large number of capillaries.

Question 3

What is the function of slow oxidative muscle fibre types?

Answer 3

Slow speed of contraction. High resistance to fatigue.

Question 4

Describe fast oxidative glycotic muscle fibre types.

Answer 4

Fast resistance to fatigue than fast glycotic but generate slightly less force. Good for games players.

Question 5

What is the structure of FOG muscle fibre types?

Answer 5

Large fibre size. Moderate number of capillaries.

Question 6

What is the function of FOG muscle fibre types?

Answer 6

Fast speed of contraction. Low resistance to fatigue.

Question 7

Describe FG muscle fibre types.

Answer 7

Greatest anaerobic capacity. Generate largest amount of force. Large stores of phosphocreatine. Good for 100m sprinters.

Question 8

What is the structure of FG muscle fibre types?

Answer 8

Large fibre size. Small number of capillaries.

Question 9

What is the function of FG muscle fibre types?

Answer 9

Fastest speed of contraction. Lowest resistance to fatigue.

Question 10

Motor unit recruitment for SO muscle fibre types.

Answer 10

• Sub-maximal aerobic work.
• Low force of contraction.
• 90 second recovery.
• Work:relief ratio of 1:1 or 1:0.5.
• No fibre damage with aerobic work so can exercise daily.

Question 11

Motor unit recruitment for FG muscle fibre types.

Answer 11

• Recruited in last 2-20 secs of contraction before fatigue.
• Accompanied by eccentric muscle fibre damage which causes DOMS.
• 4-10 days recovery.
• Rest 48 hours at least.
• Work: relief ratio of 1:3.