The Claim

Resistance training with repetition durations between 0.5 and 8 seconds is associated with similar muscle hypertrophy outcomes in healthy adults, suggesting that within this range, tempo variation does not significantly alter muscle growth.

Source: Effect of Repetition Duration During Resistance Training on Muscle Hypertrophy: A Systematic Review and Meta-Analysis

What the research says

Supports is higher

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

Supports
50score
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.

Correlation
1 study reviewed
In plain English

Lifting weights slowly or quickly between half a second and 8 seconds per rep doesn’t seem to make a difference in how much your muscles grow — as long as you’re doing resistance training.

See the scientific wording

Resistance training with repetition durations between 0.5 and 8 seconds is associated with similar muscle hypertrophy outcomes in healthy adults, suggesting that within this range, tempo variation does not significantly alter muscle growth.

What the research says

1 study

  1. Study: Effect of Repetition Duration During Resistance Training on Muscle Hypertrophy: A Systematic Review and Meta-Analysis

    This study looked at people lifting weights at different speeds — from fast (half a second) to slow (8 seconds) — and found that no matter the speed in that range, their muscles grew about the same. So, you don’t need to lift super slow to build muscle.

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.