When rats do light weight training twice a week for three months, their calf muscles get about 12% bigger—even though they’re not lifting heavy weights—so maybe you don’t need to lift heavy to build muscle.

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Evidence from Studies

Supporting (1)

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Community contributions welcome

11

Experimental chronic low‐frequency resistance training produces skeletal muscle hypertrophy in the absence of muscle damage and metabolic stress markers

Cohort Study

Animal

2010 Apr

Scientists trained rats with light workouts twice a week for 3 months and found their calf muscles got 12% bigger — even though the workouts weren’t hard or painful. This shows you can grow muscle without heavy lifting.

Contradicting (0)

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No contradicting evidence found

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According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Experimental chronic low‐frequency resistance training produces skeletal muscle hypertrophy in the absence of muscle damage and metabolic stress markers

Score: 11

DOI: 10.1002/cbf.1665

Similar Assertions

When rats do light weight exercises just twice a week for three months, their calf muscles get about 12% bigger—even though the workouts aren’t hard or frequent.

11

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Lifting weights three times a week instead of two makes your muscles grow bigger, no matter what type of muscle fibers you have — but it doesn’t make you stronger in one-rep max lifts.

62

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If a young, healthy man lifts weights for 8 weeks, his muscles will likely get bigger—by about 6%, give or take a little.

38

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Higher weekly resistance training volume leads to greater muscle hypertrophy in trained individuals.

53

52

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If you lift the same total amount of weight each week, it doesn’t matter whether you spread it out over one day or three+ days—you’ll still gain about the same amount of muscle, no matter if you’re experienced or if you’re training your arms or legs.

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78%