Andrew Huberman· PhD
Fast twitch fibers tend to be, but they're not always, bigger. They contract with a higher velocity, that's why they are called fast twitch. But they tend to be more glycolytic and less fatigable.
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
Fast twitch fibers tend to be, but they're not always, bigger. They contract with a higher velocity, that's why they are called fast twitch. But they tend to be more glycolytic and less fatigable.
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in general there's a lot of ways to describe it but the easiest way is to describe it by the name so fast twitch means that the twitch or the speed of contraction is higher and so those these fibers can contract and squeeze together with through the mechanisms we haven't got to yet we'll get there Mas in Acton um and a much rate having said that the fast R fibers tend to be larger though not always and certainly not in endurance training individuals um and definitely not with aging um that they tend to be almost they almost always are more glycolytically driven and so they're going to have more the enzymes responsible for anerobic glycolysis they're going to have more glucose in the cell they're going to have less intramuscular triglycerides and they're going to be having that generally have more phosphocreatine