The Claim
In untrained young men, a single bout of resistance exercise increases myofibrillar protein synthesis by 67% and mitochondrial protein synthesis by 69%, while a single bout of endurance exercise increases mitochondrial protein synthesis by 154% and has no effect on myofibrillar protein synthesis, demonstrating that acute exercise modality differentially regulates the synthesis rates of muscle protein fractions.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In untrained young men, one session of weight lifting raises the production of muscle structural proteins by 67% and energy-producing mitochondrial proteins by 69%, while one session of running raises mitochondrial protein production by 154% but does not change muscle structural protein production.
See the scientific wording
In untrained young men, a single bout of resistance exercise increases myofibrillar protein synthesis by 67% and mitochondrial protein synthesis by 69%, while endurance exercise increases mitochondrial protein synthesis by 154% but does not affect myofibrillar protein synthesis, indicating that acute exercise stimuli differentially activate the synthesis of muscle protein fractions based on training modality.
When you lift weights, the force on your muscles turns on a molecular switch that tells the cell to build more contractile proteins. When you run, the energy demand in your muscles turns on the same switch but only tells the cell to build more energy-producing parts. The same molecular pathway is used in both cases, but only one type of protein gets made depending on the kind of exercise.
What the research says
1 studyAfter one workout, weightlifting boosts the muscle fibers that make you stronger by 67% and the energy parts of muscle by 69%, while running only boosts the energy parts by 154% and leaves the strength fibers unchanged. This shows that different exercises turn on different parts of your muscles.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.