The Study
Myostatin Inhibition-Induced Increase in Muscle Mass and Strength Was Amplified by Resistance Exercise Training, and Dietary Essential Amino Acids Improved Muscle Quality in Mice
This study watched what happened to mice when they got a special medicine and did exercise or ate extra protein. It saw that their muscles got bigger or stronger, but it didn't prove that the medicine or food caused it — maybe something else did. So we can only say these things happened together, not that one made the other happen.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Scientists gave mice a drug to make their muscles grow, then added either exercise or special protein pills. Exercise made muscles even bigger. The protein pills didn’t make muscles bigger—but made them stronger per gram of muscle.
Where does this study sit?
Systematic Reviews & Meta-analyses
Max 100Randomized Trials
Max 90Cohort Studies
Max 72Case-Control
Max 58Cross-Sectional
Max 44Case Reports & Series
Max 30Expert Opinion
Max 514 / 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—this suggests you can make muscles work better without getting bigger, which could help elderly or sick people who can’t gain mass but need more strength.
- 2Exercise + drug: muscles grew 14% more than drug alone.
- 3Protein pills + drug: muscles stayed same size but grip strength improved.
- 4Protein synthesis was same in all groups; breakdown decreased with exercise and protein pills.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Nutrients
Year
2021
Authors
Jiwoong Jang, Sanghee Park, Yeongmin Kim, J. Jung, Jinseok Lee, Yewon Chang, Sang Pil Lee, Bum-Chan Park, R. Wolfe, C. Choi, Il-Young Kim
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.