Muscle contraction during exercise

Question 1

What are the 3 muscle fibre types?

Answer 1

Type 1- slow oxidative (SO)
Type 2a- fast oxidative glycolytic (FOG)
Type 2b- fast glycolytic (FG)

Question 2

What are SO fibres known as?

Answer 2

Endurance fibres

Question 3

What are FOG fibres known as?

Answer 3

Speed endurance fibres

Question 4

What are FG fibres known as?

Answer 4

Speed/power fibres

Question 5

What are the structural characteristics of SO fibres?

Answer 5

Fibre size- small
Neuron size- small
No.of capillaries- many 
Myoglobin content- high 
No.of mitochondria- many 
Glycogen stores- low
PC stores- low

Question 6

What are the structural characteristics of FOG fibres?

Answer 6

Fibre size- intermediate 
Neuron size- intermediate 
No.of capillaries- many 
Myoglobin content- high 
No.of mitochondria- many 
Glycogen stores- intermediate 
PC stores- intermediate

Question 7

What are the structural characteristics of FG fibres?

Answer 7

Fibre size- large
Neuron size- large
No.of capillaries- few
Myoglobin content- low
No.of mitochondria- few
Glycogen stores- high
PC stores- high

Question 8

What are the functional characteristics of SO fibres?

Answer 8

Speed of contraction- slow
Force of contraction- low
Rate of fatigue- slow
Predominant pathway for ATP resynthesis- aerobic 
Recovery rate- slow

Question 9

What are the functional characteristics of FOG fibres?

Answer 9

Speed of contraction- fast
Force of contraction- high 
Rate of fatigue- intermediate 
Predominant pathway for ATP resynthesis- aerobic/anaerobic 
Recovery rate- intermediate

Question 10

What are the functional characteristics of FG fibres?

Answer 10

Speed of contraction- fast 
Force of contraction- high 
Rate of fatigue- fast
Predominant pathway for ATP resynthesis- anaerobic 
Recovery rate- fast