The Study
Low-Load Bench Press Training to Fatigue Results in Muscle Hypertrophy Similar to High-Load Bench Press Training
This study is like taking before-and-after pictures of 9 people doing two types of weight training. It shows that both types made their muscles bigger in similar ways, but we can't be sure the training caused the changes because the study wasn't set up to prove that.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Lifting light weights until tired built as much muscle as lifting heavy weights, but didn't make people as strong.
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 531 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes, these are meaningful changes in muscle size and strength for humans.
- 2Muscle size grew about 10-21% with both methods, but strength only went up 6-8% with light weights vs 14-21% with heavy weights.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
International Journal of Physical Medicine and Rehabilitation
Year
2013
Authors
R. Ogasawara, J. Loenneke, R. Thiebaud, T. Abe
Related Content
Claims (3)
Lifting heavy weights regularly is needed to get the most strength gains in exercises you practice, because doing lighter weights until tired gives less strength boost even if muscles grow the same size.
This claim says that lifting lighter weights until you're tired, done regularly for six weeks, can build muscle just as well as lifting heavier weights. It specifically found growth in arm and chest muscles, showing you don't always need heavy weights to get stronger.
Lifting lighter weights until you can't lift anymore doesn't make you as strong as lifting heavier weights, even though both make your muscles grow about the same size.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.