 In groups:  Step 1 & Step 2: Drexler, Bhavesh & Charlotte  Step 3, Step 4 & Step 5: Saratha & Sam  You have 10 minutes to use the plasticine/play dough etc and or diagrams to explain the assigned step of the Sliding Filament theory.  If it helps put your model on the paper and label the parts on the paper Timer

Learning Outcomes  All able to remember and understand the 3 different types of fibres  Most are able to apply knowledge of the fibres to sporting events.  Some are able to justify the proportions of muscle fibres in each muscle

 Answer exam questions 3 & 4 on p42 (sheet from last week).  Pick three different athletes from three different sports. Discuss and justify what you think their distribution of muscle fibres would be. In addition answer and explain the following statement: “can muscle fibre distribution predict success in certain sporting activities?”

 Brain storm on A3 piece of paper what you already know about Muscle Fibres.

 Within skeletal muscle there are 3 types of muscle fibres. All contain a mixture of all three but not in equal proportions.  This mix is mainly genetically determined.  These fibres are grouped into motor units, only one type of fibre can be found in one unit.  (Motor unit – the motor nerve and the group of muscle fibres that it controls)

 In groups complete the I am type….. sheet to demonstrate your knowledge of the three types of fibres.  Extension: Look at Fig 2.07 – what does it suggest?  Although fast twitch fibres generate much greater forces they have a higher fatigue index meaning shorter contraction time.

 The relative proportion of each fibre type varies in the same muscles of different people.  Elite endurance – greater proportion of slow twitch fibres  Elite sprinter – greater proportion of fast twitch fibres

Generally true but there are other determining factors: - length of lever - VO2 max - physique - motivation - confidence

Using characteristics of muscle fibres discuss the differences using sporting examples. Be prepared to share your thoughts with the class.

 Using the sporting pictures create a continuum like the one shown below according to the fibre type predominantly used by the selected performer. _________________________________ Type 1 Type 2a Type 2b  Now look at Fig 2.09 to check your continuum

 In pairs attempt the exam question  Peer mark the answer in green pen

 Plenary Activity: Look again at your A3 piece of paper, using a green pen what can you add to it now. Learning Outcomes All able to remember and understand the 3 different types of fibres Most are able to apply knowledge of the fibres to sporting events. Some are able to justify the proportions of muscle fibres in each muscle