Fast Twitch muscle fibres: Rapid rate of contraction, Tire out quickly, Fewer mitochondria, Large concentration of Glycogen, Lots of Sarcoplasmic Reticulum, Large amount of Anaerobic respiration enzymes, Reduced Myoglobin content, Appears as large & white, Reduced capillary network, Used when sprinting and lifting weights, Slow Twitch muscle fibres: Contract continuously for extended periods, Don't tire out, Large numbers of mitochondria, Used in marathons & long distance cycling, Little or no Glycogen, Reduced Sarcoplasmic Reticulum, Large amount of Aerobic respiration enzymes, Large amount of Myoglobin, Appears as small & red, Dense capillary network,

Comparing Fast & Slow Twitch muscle fibres

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