MUSCLE FIBRE TYPES http://www.youtube.com/watch?v=0XhSlRkytkE.

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Presentation transcript:

MUSCLE FIBRE TYPES http://www.youtube.com/watch?v=0XhSlRkytkE

MUSCLE FIBRE TYPES SLOW TWITCH FAST TWITCH FATIGUE RESISTANT LOW POWER OUTPUT FAST TWITCH EASILY FATIGUED HIGH POWER OUTPUT TYPE IIA & IIB

FAST TWITCH FIBRES TYPE IIA TYPE IIB FOG (FAST OXYDATIVE GLYCOLYTIC) TYPE IIB FG (FAST GLYCOLYTIC) MOST FORMS OF HIGH INTENSITY EXERCISE CONVERTS FG TO FOG

MUSCLE FIBRE COMPOSITION MOST MUSCLES HAVE A COMBINATION OF FIBRE TYPES GASTROCNEMIUS - HIGH FAST SOLEUS - HIGH SLOW COMPOSITION CHANGES DUE TO TRAINING STIMULUS

MUSCLE FIBRE COMPOSITION HIGH NO. OF TYPE I GREATER VO2 MAX GREATER ENDURANCE CAPACITY HIGH NO. OF TYPE II GREATER STRENGTH & POWER POTENTIAL LOWER VO2 MAX

Effect of a Warm Up on Skeletal Muscle Tissue Effect on Speed and Force of Contraction Speed - Increased Force - Increased

EXAM QUESTION During the race, the swimmer has to dive off the starting blocks as quickly as possible. Identify the ‘muscle fibre type’ used to complete this action and justify this action (3 marks)

ANSWER Fast twitch fibres/type 2 Type 2b/fast twitch glycolytic/FTG Fast speed of contraction High force of contraction/powerful contraction/ strong contraction NOT characteristics

EXAM QUESTION Describe the characteristics of the main muscle fibre type used by elite sprinters. (4 marks)

ANSWER Fast contracting High force production/more powerful Low lactate/fatigue tolerance/lactate threshold Larger/faster motor neurone High sarcoplasmic reticulum development More/thicker myosin/larger/bigger diameter High PC stores/levels of creatine kinase High glycogen stores High glycolytic/anaerobic/ATPase enzyme capacity