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Muscle Fibre Types

Fast twitch fibres: Fast Glycolytic (Type IIb) Fast Oxidative Glyc. (Type IIb). Slow twitch fibres: Slow Oxidative (Type I). Muscle Fibre Types. A. Slow Twitch Fibres. Suited for repeated contractions during activities requiring a force output of < 20-25% of max force output

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Muscle Fibre Types

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  1. Fast twitch fibres: Fast Glycolytic (Type IIb) Fast Oxidative Glyc. (Type IIb) Slow twitch fibres: Slow Oxidative (Type I) Muscle Fibre Types Sport Books Publisher

  2. A. Slow Twitch Fibres • Suited for repeated contractions during activities requiring a force output of < 20-25% of max force output • Examples: lower power activities, endurance events Sport Books Publisher

  3. B) Fast Twitch Fibres • Significantly greater force and speed generating capability than slow twitch fibres • Well suited for activities involving high power • Examples: sprinting, jumping, throwing Sport Books Publisher

  4. The Muscle Biopsy • Used to determine muscle fibre type 1. Injection of local anesthetic into the muscle being sampled 2. Incision of approximately 5-7mm is made in the skin and fascia of the muscle 3. The piece of tissue (250-300mg) removed via the biopsy needle is imbedded in OCT compound 4. The sample is frozen in isopentane cooled to –180C Sport Books Publisher

  5. Muscle Biopsy Sport Books Publisher

  6. The Histochemistry • The biopsy samples are first sectioned (8-10 μm thickness) • Sections are processed for myosin ATPase: Fast twitch fibres – rich in myosin ATPase – white in colour Slow twitch fibres – low in myosin ATPase – Red in colour Sport Books Publisher

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