The Claim

When total training volume is held constant, there is no meaningful difference in muscle hypertrophy outcomes between resistance training performed once per week and resistance training performed three or more times per week.

Source: How many times per week should a muscle be trained to maximize muscle hypertrophy? A systematic review and meta-analysis of studies examining the effects of resistance training frequency

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
20score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Quantitative
1 study reviewed
In plain English

If you lift the same total amount of weight each week, it doesn’t matter whether you do it all in one day or spread it out over three or more days—you’ll gain about the same amount of muscle.

See the scientific wording

There is no meaningful difference in muscle hypertrophy outcomes when comparing resistance training frequencies of 1 day per week versus 3 or more days per week, provided total training volume is equal.

What the research says

1 study

  1. Study: How many times per week should a muscle be trained to maximize muscle hypertrophy? A systematic review and meta-analysis of studies examining the effects of resistance training frequency

    When you lift weights the same total amount each week, it doesn’t matter if you do it in one long session or spread it over three sessions — your muscles grow about the same either way.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.