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Muscle Fibre types

Muscle Fibre types. MUSCLE FIBRE TYPES and Their Properties. Basically if a stimulus is received by muscle cells (fibres) and it is great enough to cause a response – the fibres respond by contracting & relaxing (1 st glimpse at “All or None principle”). MUSCLE FIBRE TYPES and Their Properties.

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Muscle Fibre types

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  1. Muscle Fibre types

  2. MUSCLE FIBRE TYPES and Their Properties • Basically if a stimulus is received by muscle cells (fibres) and it is great enough to cause a response – the fibres respond by contracting & relaxing (1st glimpse at “All or None principle”).

  3. MUSCLE FIBRE TYPES and Their Properties • All muscle fibre types can operate at the same metabolic capabilities, but some are better biochemically equipped to work anaerobically or aerobically (without or with oxygen). • Anaerobic – activity of a high intensity that does not allow oxygen to be used in the metabolic process of ATP breakdown (e.g. maximal effort sprint 50m); if duration of activity of such an intensity continues, lactic acid is produced and build-up leads to fatigue (e.g. maximal effort 200m sprint) • Aerobic – activity of a lower intensity in which oxygen is used in the process of breaking down carbohydrates & fats for fuel source (e.g. 5 min + jogging)

  4. Type 1 • Slow-twitch fibres (ST) • AEROBIC (with O2) • Red in colour • Type I (slow-oxidative) • E.g. leg muscles

  5. Type 2A and 2B • Fast-twitch (FT) • ANAEROBIC (Without O2) • White in colour • Type IIa & IIb • E.g. arm muscles

  6. MUSCLE FIBRE TYPES and Their Properties • During the teen years, the number of ST and FT fibres become “fixed”; training can elicit some change, but for the most part, # of specific fibres & arrangement is pre-determined by genetics.

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