1. Fast & Slow twitch muscle fibres
Year 11 P.E
How muscles respond to training and physical activity… each fiber type is unique in its ability to contract in a certain way. Human muscles contain a genetically determined mixture of both slow and fast fiber types. On average, we have about 50 percent slow twitch and 50 percent fast twitch fibers in most of the muscles used for movement.

2. What’s the difference?

3. Slow twitch
Red fibres – best suited to aerobic, endurance work. Eg. Triathlon (Type 1 fibres)
Contract slowly (perform over
long periods, low force)

4. Fast twitch
White fibres – best suited to short-duration, high intensity anaerobic work. Eg. Sprinting (Type II fibres)
Produce larger force, tire more rapidly

5. Fast twitch Type A & B P. 24 Type A : Partially aerobic
Type B: Purely anaerobic

6. Testing your muscle fibre make-up
Muscle Biopsy (removal of a sample of tissue for lab examination)

7. Revision!!! SAC - Monday
Create your own revision PP covering all of the relevant information (use pictures of yourself completing movement wherever possible)

8. Thinking things through p. 26
Complete Qu’s 3 & 4