The Study
Impact of high versus low fixed loads and non-linear training loads on muscle hypertrophy, strength and force development
This study is like a science experiment where people were randomly put into different exercise groups. It shows that different weights might cause similar muscle growth when lifting to failure, but we can't be completely sure because the study was small.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Young men lifted weights until they couldn't anymore for 8 weeks. Heavy weights made them much stronger and faster, but muscle growth was the same with heavy or light weights.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 546 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes, heavy weights clearly boost strength and power more than light weights for athletes.
- 2Muscle size grew 9% for all.
- 3Heavy weights increased strength by 27% and speed by 96%.
- 4Switching weights every 2 weeks didn't help more.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
SpringerPlus
Year
2016
Authors
J. Fink, N. Kikuchi, S. Yoshida, Kentaro Terada, K. Nakazato
Related Content
Videos (2)
Claims (6)
When you lift weights until you can't anymore, you build similar muscle size no matter how heavy the weights are, but lifting heavier weights makes you stronger and faster at moving them than lighter weights.
Switching between heavy and light weightlifting every two weeks doesn't build more muscle or strength than sticking with either heavy or light weights alone in young male athletes over two months.
When young male athletes lift weights until they can't anymore, it doesn't matter much whether they use heavy weights or lighter ones—both ways build about the same amount of muscle after 8 weeks.
Lifting heavy weights for fewer reps and lighter weights for more reps both build muscle about the same in young men when you push yourself to the max, showing that the total work done matters more than how heavy you lift.
Lifting heavy weights until you can't lift anymore makes young male athletes much stronger than lifting lighter weights over 8 weeks, showing that heavier loads train muscles and nerves better.
When young male athletes lift heavy weights until they can't anymore, they get much faster at generating power quickly, but this doesn't happen with lighter weights.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.