Slow Twitch and Fast Twitch Muscle Fibres Did you eat white meat or dark meat over the holidays?
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Transcript of Slow Twitch and Fast Twitch Muscle Fibres Did you eat white meat or dark meat over the holidays?
![Page 1: Slow Twitch and Fast Twitch Muscle Fibres Did you eat white meat or dark meat over the holidays?](https://reader035.fdocuments.in/reader035/viewer/2022062309/5697bf721a28abf838c7eb81/html5/thumbnails/1.jpg)
Slow Twitch and Fast Twitch Muscle Fibres
Did you eat white meat or dark meat over the holidays?
![Page 2: Slow Twitch and Fast Twitch Muscle Fibres Did you eat white meat or dark meat over the holidays?](https://reader035.fdocuments.in/reader035/viewer/2022062309/5697bf721a28abf838c7eb81/html5/thumbnails/2.jpg)
Slow-Twitch
Most active during: long-distance running, swimming, and cycling
Red or dark in colourGenerate and relax tension slowly; able to
maintain a lower level of tension for long durations
Low levels of myosin ATPase and glycolytic enzymes
High levels of oxidative enzymes
![Page 3: Slow Twitch and Fast Twitch Muscle Fibres Did you eat white meat or dark meat over the holidays?](https://reader035.fdocuments.in/reader035/viewer/2022062309/5697bf721a28abf838c7eb81/html5/thumbnails/3.jpg)
Fast-Twitch
Ideal for: short sprints, power lifting, and explosive jumping
Pale in colourAbility to tense and relax quickly; generate large
amounts of tension with low endurance levelsHigh levels of myosin ATPase and glycolytic
enzymes
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Fast vs. Slow
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Approximate Distribution of Muscle Fibre Types for Different Sports
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The Importance of Myoglobin
• The difference in _____________________ is determined by the amount of ____________ used in energy production
• Myoglobin: ____________________________
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Myoglobin
• Slow fibres vs. Fast fibres– Slow twitch fibres are __________ in myoglobin
– Fast Twitch Fibres have ______________ amounts of myoglobin
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3 Fibre Types Type I or Slow-Oxidative (SO)
Type IIA or Fast-Oxidative Glycolytic (FOG)
Type IIB of Fast-Glycolytic (FG)
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Why the Split of Type II Fibres?
• Studies have shown that there is evidence for changing the type ________to Type ______ muscle fibres with endurance training
• THERE IS NO WAY ANY TYPE ___ MUSCLE FIBRES CAN BECOME TYPE ____
• In other words a fast twitch muscle can _________become a slow twitch muscle
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Characteristics of Different Muscle Fibre Types
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So how are the fibres distributed?
• How a muscle works is determined by its fibre type and vice versa
• TWO categories for basic muscle functions:– Tonic – Phasic
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Tonic Muscles• These are used on a daily basis for
• High concentration of _________ twitch fibres (Type I)
• Great for endurance activities• Core and back muscles: constantly contracted
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Phasic Muscle
• Higher percentage of ________ twitch fibres• Example: Biceps have a lower amount of Type
I fibres and a higher amount of type II because they are used for explosive movement (lifts)
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So how do you find where these fibres are?
• The only true way is to do a _____________to find the percentage of each type of fibre.
• Muscle biopsy: tissue sample using a needle to take a small amount from the muscle belly
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Athletic Performance
• Elite athletes may have __________% of a specific fibre type in their body
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Why does Kenya keep winning in long distance?
• You are going to read a short article on page 91
• Answer the following questions– What has been found regarding the Kenyan’s
muscle fibre type?– What social factors have played a large role in
Kenyan runners?