Narrative review — 2025 — Training volume · Hypertrophy
Is there a volume saturation point for muscle hypertrophy in resistance-trained individuals? A narrative review
What did the researchers investigate?
Whether there is a 'saturation point' beyond which more training volume stops adding muscle in trained people, or whether conflicting results reflect study methods and individual differences.
What did they find?
Higher volumes are linked with more signals for muscle building, though not in every study, and very high volumes may raise muscle breakdown. Methodological issues (muscle and exercise choice, not accounting for prior training volume, small studies, large differences between individuals) make the dose-response hard to pin down. Whether a true saturation point exists remains unclear.
What does this mean for training?
There is no settled 'maximum useful volume'. Individual response varies, which argues for sensible ranges and adjusting from your own results rather than chasing ever-higher set counts.
How does FitX AI use this evidence?
FitX AI uses bounded weekly ranges by experience rather than open-ended volume increases, and adjusts each lift from your logged results.
Where FitX AI's own choices go beyond this paper
Weekly sets per muscle. The bands (8-12, 12-16 or 16-20 sets) and the half-set counting are FitX AI choices; the research gives trends, not individual prescriptions.
Limitations
A narrative review: it discusses the evidence but does not pool data or reach a quantitative conclusion.