Research
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Resistance exercise intensity affects myofibrillar protein synthesis (MPS) in a dose-dependent manner at low intensities, plateauing between 60-90% of 1RM, while training status alters the specific protein fractions synthesized (myofibrillar vs. mitochondrial).
For muscle growth, you do not need to lift at maximum capacity. Research indicates that myofibrillar protein synthesis plateaus between 60% and 90% of your one-repetition maximum. Focus on this moderate-to-high intensity range for efficient hypertrophy.
GoodQualifiesHIGH confidence
Our results indicate that the magnitude of the myofibrillar protein synthesis response is intensity dependent at low intensities, with a plateau at intensities between 60 and 90% of 1 RM.
Why this rating
Based on specific human studies cited in the review.
Source
Human muscle protein synthesis and breakdown during and after exercise
Vinod Kumar et al. · Journal of Applied Physiology · 2009
DOI 10.1152/japplphysiol.91481.2008
narrative_reviewCited 289×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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