πŸ‘· Muscle contraction fuels and conditions


Energy for Muscles
Types of Muscle


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Energy for Muscles

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Muscles use ATP from aerobic respiration to contract. However, depending on muscle type (below), anaerobic respiration may be carried out to provide energy very quickly. When this is the case, a reaction involving both ATP and PCr (phosphocreatine) occurs. The trick here is that unlike typical anaerobic respiration, no lactate is produced.

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Glycogen stored in muscle is the next port of call for energy during muscle contraction, as it can be broken down into glucose. In the absence of sugar-based energy, cortisol is released which stimulates protein breakdown as another source of energy.

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Types of Muscle

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There are two main kinds of muscle fibre: slow twitch and fast twitch. Hmm, I do wonder what…