Muscle Fibres Flashcards
What is another name for Slow Twitch Muscle Fibres?
Type 1
In which type of sports are Slow Twitch (type I) muscle fibres used?
Long distance events
What are the 5 characteristics of Slow Twitch (type 1) muscle fibres?
- Contract slowly
- Produce low amounts of force
- Can cope with prolonged activity
- Are slow to fatigue
- Have a high aerobic capacity
What type of muscles does long-distance running use?
Slow twitch
Which type of muscles contract slowly?
Slow twitch
Which type of muscles produce a low amount of force?
Slow twitch
Which type of muscles are slow to fatigue?
Slow twitch
Which type of muscles have high aerobic capacity?
Slow twitch
Why are slow twitch muscle fibres beneficial for endurance athletes?
They can cope with prolonged activity
What are the names of the two types of Fast Twitch Muscle Fibres?
Type 11a and type 11b
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)?
Type 11a
Type IIa muscle fibres are used in which sports?
Moderate intensity events, such as 400m, 800m and 1500m
What are the 4 characteristics of Fast Twitch Muscle Fibres (type IIa)?
- Have the fastest contractions of the three muscle fibre types
- Produce the highest amounts of force
- Fatigue most quickly due to lactic acid build-up
- Produce explosive power
Which type of muscle fibres have a medium rate of contraction in comparison to the other two types?
Fast twitch type 11a
Which type of muscle fibres produce medium amounts of force?
Fast twitch type 11a
Which type of muscle fibres are fairly resistant to fatigue?
Type 11a
Which type of muscle fibres have a medium level of aerobic capacity?
Type 11a
Why are fast twitch muscle fibres (type IIa) beneficial for middle distance runners and swimmers?
Because they avoid fatigue
In which type of sports are Fast Twitch (type IIb) muscle fibres used?
Short sprints such as, 100m and 200m
What action in basketball requires the use of Fast Twitch (type IIb) muscle fibres?
The jump shot
What action in tennis requires the use of Fast Twitch (type IIb) muscle fibres?
A serve in tennis
What are the 4 characteristics of Fast Twitch (type IIb) muscle fibres?
- Have the fastest contractions of the three muscle fibre types
- Produce the highest amounts of force
- Fatigue most quickly due to lactic acid build up
- Produce explosive power
Which type of muscle fibres have the fastest rate of contraction in comparison to the other two types?
Type 11b
Which type of muscle fibres produce the highest amounts of force?
Type 11b
Which type of muscle fibres fatigue most quickly due to lactic acid build-up?
Type 11b
Which type of muscle fibres produce explosive power?
Type 11b
Explain one characteristic of a type IIb muscle fibre and one sport that requires this characteristic.
Produce explosive power to be able to burst out of the starting blocks
Explain one characteristic of a type IIa muscle fibre and one sport that requires this characteristic.
Have a medium level of aerobic capacity so that the performer can run for medium amounts of length.
Explain one characteristic of a slow twitch (type I) muscle fibre and one sport that requires this characteristic.
Slow to fatigue so the performer can do an activity for long periods of time
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?
Type 1, type 11a, type 11b
Type IIb muscle fibres are recruited only when the intensity of the activity reaches more than what percentage of the maximum?
60% +
Which muscle fibres are recruited when the intensity of the activity reaches more than 60% of the maximum?
Type 11b
What is ‘ramp-like recruitment’ of muscle fibres?
The increased recruitment of muscle fibres as the activity increases
As activity increases, the recruitment of muscle fibres is increased. What is this called. (Think about the shape that it takes on a graph.)
Ramp-like recruitment
