1. Muscle Contraction

2. Learning Objectives To know the different muscle fibre types.
To understand the structural and functional characteristics of the different muscle fibre types.
To be able to justify different muscle fibre types in different sports performers.

3. Slow twitch (Type 1)
Fast oxidative glycolytic (Type 2a/ FOG)
Fast Glycolytic (Type 2b/ FG)

4. Muscle Fibre Types Characteristics Slow Twitch (Type 1)
Fast Oxidative Glycolytic (Type 2a/ FOG)
Fast Glycolytic (Type 2b/ FG)
Fibre size
Number of mitochondria
Number of capillaries
Myoglobin content
PC stores
Glycogen stores
Triglyceride stores
Speed of contraction
Force of contraction
Resistance to fatigue
Aerobic capacity
Anaerobic capacity
Small
Large
Moderate
High
Low
Highest
Slow
Fastest
Lowest
Myoglobin - a protein found in the muscle cells of animals. It functions as an oxygen-storage unit, providing oxygen to the working muscles. 
PC - One of the ways that this ATP supply is regenerated is through the molecule creatine phosphate (or phosphocreatine). 
Glycogen - a multi-branched polysaccharide of glucose that serves as a form of energy storage in animals.
Triglyceride - Fat and carbohydrate storage within muscle fibres are called intramusculartriglycerides.

5. Characteristics
Slow Twitch (Type 1)
MARATHON
Fast Oxidative Glycolytic (Type 2a/ FOG)
800M
Fast Glycolytic (Type 2b/ FG)
SPRINT HURDLES
Fibre size
Number of mitochondria
Number of capillaries
Myoglobin content
PC stores
Glycogen stores
Triglyceride stores
Speed of contraction
Force of contraction
Resistance to fatigue
Aerobic capacity
Anaerobic capacity

6. Muscle Fibre Types TASK
Cut out/ print out pictures of different types of performers. Stick them in and under each picture make a prediction of the relative percentages of the three types of muscle fibre in specific skeletal muscles. Justify your answer by using your knowledge of the structural and functional characteristics of muscle fibres.
Athlete
Gender
Muscle
Slow Twitch %
Fast Twitch %
Sprinters M F
Gastrocnemius
24%
27%
76%
73%
Distance runners
79%
69%
21%
31%