The Claim
In young men undergoing short-term energy restriction, resistance exercise has no effect on the gene expression of Atrogin-1, MuRF-1, Foxo3a, LC3, Gabarapl1, Ulk2, Beclin1 or on the phosphorylation status of p-Foxo3a and p-TSC2.
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 young men on a short-term calorie-restricted diet, performing resistance exercise does not change the activity levels of specific genes and proteins known to be involved in muscle breakdown.
See the scientific wording
During short-term energy restriction in young men, resistance exercise does not alter gene expression of key muscle atrophy markers (Atrogin-1, MuRF-1, Foxo3a, LC3, Gabarapl1, Ulk2, Beclin1) or phosphorylation of p-Foxo3a and p-TSC2, indicating these pathways are not mechanistically involved in the exercise-induced preservation of muscle protein synthesis.
When a person eats less but lifts weights, their muscles make more protein because the workout turns on a signal that tells the muscle to build protein. This keeps the muscle from shrinking, even though the body is in energy shortage. The genes and proteins that normally break down muscle stay unchanged, so the protection comes from making more protein, not from stopping breakdown.
What the research says
1 studyWhen young men lost weight while lifting weights, their muscle-wasting genes and proteins didn’t change — meaning the weights didn’t stop muscle breakdown. Instead, the muscles kept making protein, which is why they didn’t shrink as much.
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.