Slow-twitch muscle fibers need longer workout times to grow because they tire less easily. This can be done by lifting lighter weights until you can't lift anymore.

Evidence from Studies

Supporting (1)

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Inducing hypertrophic effects of type I skeletal muscle fibers: A hypothetical role of time under load in resistance training aimed at muscular hypertrophy.

Editorial/Opinion

2018 Mar

The study talks about the same idea as the claim: using light weights until you can't lift anymore might help grow certain slow-twitch muscles better because they tire less easily. It supports the claim but is more like a discussion than proof.

Contradicting (0)

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No contradicting evidence found

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Source Study

Inducing hypertrophic effects of type I skeletal muscle fibers: A hypothetical role of time under load in resistance training aimed at muscular hypertrophy.

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DOI: 10.1016/j.mehy.2018.01.012

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Lifting lighter weights with more reps might make your slow-twitch muscles grow bigger than lifting heavier weights with fewer reps.

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Even if you lift light weights, if you go until you can’t do another rep, your muscles end up using almost all the same fibers as if you lifted heavy — which might be why both ways make muscles grow similarly.

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