The Claim

In untrained young men, performing three sets per exercise for lower-body resistance training over 11 weeks causes a 41% increase in one-repetition maximum strength and an 11% increase in thigh muscle cross-sectional area, both significantly greater than the 21% increase in one-repetition maximum strength and 7% increase in thigh muscle cross-sectional area observed with one set per exercise.

Source: DISSIMILAR EFFECTS OF ONE‐ AND THREE‐SET STRENGTH TRAINING ON STRENGTH AND MUSCLE MASS GAINS IN UPPER AND LOWER BODY IN UNTRAINED SUBJECTS

What the research says

Supports is higher

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

Supports
54score
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.

Cause and effect
1 study reviewed
In plain English

In untrained young men, doing three sets of lower-body weight exercises per movement for 11 weeks leads to a 41% greater increase in maximum leg strength and an 11% greater increase in thigh muscle size compared to doing only one set per movement.

See the scientific wording

In untrained young men, performing three sets per exercise for lower-body resistance training over 11 weeks results in a 41% increase in one-repetition maximum strength and an 11% increase in thigh muscle cross-sectional area, both significantly greater than the 21% and 7% gains observed with one set per exercise, indicating that higher training volume enhances strength and hypertrophy gains in the legs.

Why this might work

Doing more sets of leg exercises creates more force and fatigue in the muscles, which turns on a molecular switch that tells the muscle cells to build more protein. This makes the muscle fibers thicker, which lets them generate more force and lift heavier weights.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: DISSIMILAR EFFECTS OF ONE‐ AND THREE‐SET STRENGTH TRAINING ON STRENGTH AND MUSCLE MASS GAINS IN UPPER AND LOWER BODY IN UNTRAINED SUBJECTS

    In guys who’ve never lifted weights before, doing three sets of leg exercises instead of one set for 11 weeks led to much bigger gains in leg strength and muscle size — exactly what the claim says.

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.