Muscles: Muscle Fibre Types Flashcards
What are the 2 types of muscle fibres?
Fast-twitch and Slow Twitch Muscle Fibres
What type of activities are fast-twitch fibres suited to, and give examples
High intensity, explosive, short duration activities such as sprinting, javellin, boxing, weight-lifting, etc.
What type of activities are slow-twicth fibres suited to, and give examples
Low intensity, long duration aerobic sports such as marathons, triathlons, cross-country skiing, etc.
What is the colour of each muscle fibre type and why?
- Slow Twitch - Red due to high supply of blood
- Fast Twitch - White due to low supply of blood
Explain aerobic and anaerobic
Aerobic is with presence of oxygen and anaerobic isn’t
State fibre size for each muscle fibre type
- Slow Twitch - Small
- Fast Twitch - Large
State resistance to fatigue for each fibre type
- Slow Twitch - High
- Fast Twitch - Low
State force production capabilities for each fibre type
- Slow Twitch - Low
- Fast Twitch - High
State speed of contraction for each muscle fibre type
- Slow Twitch - Slow
- Fast Twitch - Very Fast
Explain hypertrophy potential for each muscle type
Hypertrophy is ability of muscles to grow
- Slow Twitch - Low, harder to grow these muscles
- Fast Twitch - High, easier to grow these muscles
Explain mitochondrial density for each muscle fibre type
- Slow Twitch - High
- Fast Twitch - Low
Mitochondria uses oxygen to create energy, therefore slow-twicth fibres have higher fatigue resistance
Explain capillary density for each muscle type
- Slow Twitch - High, bringing in lots of blood with supply of oxygen
- Fast Twitch - Low, brings less bloow with lower supply of oxygen
Explain Myoglobin content for each muscle fibre type
- Slow Twitch - High
- Fast-twitch - Low
Myoglobin carries oxygen from bloodstream to Mitochondria
Explain Oxidative capacity fo each muscle fibre type
- Slow-twitch - High
- Fast-twitch - Low
Explain Glycolytic capacity for each muscle fibre type
- Slow twitch - Low
- Fast-twitch - High
