The Claim

In previously resistance-trained young adult males, eight weeks of volume-equated daily undulating periodization resulted in increased muscle thickness in the chest, distal lateral quadriceps, and anterior quadriceps, but not in the mid lateral quadriceps, indicating regional differences in hypertrophic response.

Source: Volume-equated high- and low-repetition daily undulating programming strategies produce similar hypertrophy and strength adaptations.

What the research says

Supports is higher

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

Supports
45score
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.

Description
1 study reviewed
In plain English

After eight weeks of a specific weight training program, muscle thickness increased in some parts of the legs and chest but not in other parts of the legs in young men who had previously trained with weights.

See the scientific wording

In previously resistance-trained young adult males, muscle thickness increased in the chest, distal lateral quadriceps, and anterior quadriceps but not in the mid lateral quadriceps after eight weeks of volume-equated daily undulating periodization, suggesting regional hypertrophy responses may vary independently of repetition range.

Why this might work

When muscles are stretched under load, some parts of the muscle fibers experience more tension than others. Areas that stretch the most trigger more signals that tell the muscle to build new protein, causing those specific regions to grow thicker. Other areas that don’t stretch as much don’t get the same signal, so they don’t grow.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: Volume-equated high- and low-repetition daily undulating programming strategies produce similar hypertrophy and strength adaptations.

    People who trained with either heavy or light weights for eight weeks saw some parts of their chest and thighs get thicker, but the middle part of the outer thigh didn’t change—no matter what weight they used. This means some muscle areas grow more easily than others, even when you do the same total amount of work.

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.