Muscle Fibres

Question 1

What is another name for Slow Twitch Muscle Fibres?

Answer 1

Type 1

Question 2

In which type of sports are Slow Twitch (type I) muscle fibres used?

Answer 2

Long distance events

Question 3

What are the 5 characteristics of Slow Twitch (type 1) muscle fibres?

Answer 3

1. Contract slowly
2. Produce low amounts of force
3. Can cope with prolonged activity
4. Are slow to fatigue
5. Have a high aerobic capacity

Question 4

What type of muscles does long-distance running use?

Answer 4

Slow twitch

Question 5

Which type of muscles contract slowly?

Answer 5

Slow twitch

Question 6

Which type of muscles produce a low amount of force?

Answer 6

Slow twitch

Question 7

Which type of muscles are slow to fatigue?

Answer 7

Slow twitch

Question 8

Which type of muscles have high aerobic capacity?

Answer 8

Slow twitch

Question 9

Why are slow twitch muscle fibres beneficial for endurance athletes?

Answer 9

They can cope with prolonged activity

Question 10

What are the names of the two types of Fast Twitch Muscle Fibres?

Answer 10

Type 11a and type 11b

Question 11

Which type of Muscle Fibres are used for moderate levels of intensity such as middle-distance running & swimming (400m, 800m and 1500m (1.5K) ) , racquet sports (particularly during rallies)?

Answer 11

Type 11a

Question 12

Type IIa muscle fibres are used in which sports?

Answer 12

Moderate intensity events, such as 400m, 800m and 1500m

Question 13

What are the 4 characteristics of Fast Twitch Muscle Fibres (type IIa)?

Answer 13

1. Have the fastest contractions of the three muscle fibre types
2. Produce the highest amounts of force
3. Fatigue most quickly due to lactic acid build-up
4. Produce explosive power

Question 14

Which type of muscle fibres have a medium rate of contraction in comparison to the other two types?

Answer 14

Fast twitch type 11a

Question 15

Which type of muscle fibres produce medium amounts of force?

Answer 15

Fast twitch type 11a

Question 16

Which type of muscle fibres are fairly resistant to fatigue?

Answer 16

Type 11a

Question 17

Which type of muscle fibres have a medium level of aerobic capacity?

Answer 17

Type 11a

Question 18

Why are fast twitch muscle fibres (type IIa) beneficial for middle distance runners and swimmers?

Answer 18

Because they avoid fatigue

Question 19

In which type of sports are Fast Twitch (type IIb) muscle fibres used?

Answer 19

Short sprints such as, 100m and 200m

Question 20

What action in basketball requires the use of Fast Twitch (type IIb) muscle fibres?

Answer 20

The jump shot

Question 21

What action in tennis requires the use of Fast Twitch (type IIb) muscle fibres?

Answer 21

A serve in tennis

Question 22

What are the 4 characteristics of Fast Twitch (type IIb) muscle fibres?

Answer 22

1. Have the fastest contractions of the three muscle fibre types
2. Produce the highest amounts of force
3. Fatigue most quickly due to lactic acid build up
4. Produce explosive power

Question 23

Which type of muscle fibres have the fastest rate of contraction in comparison to the other two types?

Answer 23

Type 11b

Question 24

Which type of muscle fibres produce the highest amounts of force?

Answer 24

Type 11b

Question 25

Which type of muscle fibres fatigue most quickly due to lactic acid build-up?

Answer 25

Type 11b

Question 26

Which type of muscle fibres produce explosive power?

Answer 26

Type 11b

Question 27

Explain one characteristic of a type IIb muscle fibre and one sport that requires this characteristic.

Answer 27

Produce explosive power to be able to burst out of the starting blocks

Question 28

Explain one characteristic of a type IIa muscle fibre and one sport that requires this characteristic.

Answer 28

Have a medium level of aerobic capacity so that the performer can run for medium amounts of length.

Question 29

Explain one characteristic of a slow twitch (type I) muscle fibre and one sport that requires this characteristic.

Answer 29

Slow to fatigue so the performer can do an activity for long periods of time

Question 30

The type and number of muscle fibres needed during a sporting event change as the levels of effort in the sport change. In which order are types of muscles fibres recruited?

Answer 30

Type 1, type 11a, type 11b

Question 31

Type IIb muscle fibres are recruited only when the intensity of the activity reaches more than what percentage of the maximum?

Answer 31

60% +

Question 32

Which muscle fibres are recruited when the intensity of the activity reaches more than 60% of the maximum?

Answer 32

Type 11b

Question 33

What is 'ramp-like recruitment' of muscle fibres?

Answer 33

The increased recruitment of muscle fibres as the activity increases

Question 34

As activity increases, the recruitment of muscle fibres is increased. What is this called. (Think about the shape that it takes on a graph.)

Answer 34

Ramp-like recruitment