The Claim
In young men, low-load high-volume resistance exercise (30% 1RM to failure) induces greater and more sustained activation of the p70S6K and Erk1/2 signaling pathways at 4 hours post-exercise compared to high-load low-volume or work-matched training, indicating that these signaling pathways are sensitive to total repetitions and fatigue.
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, performing resistance exercises with light weights and many repetitions to failure causes stronger and longer-lasting activation of two specific cellular signaling pathways at four hours after exercise than lifting heavy weights with fewer repetitions, even when the total work done is the same.
See the scientific wording
In young men, low-load high-volume resistance exercise (30% 1RM to failure) induces greater and more sustained activation of the p70S6K and Erk1/2 signaling pathways at 4 hours post-exercise than high-load low-volume or work-matched training, suggesting these pathways are sensitive to total repetitions and fatigue.
When muscles perform many repetitions until exhaustion, the buildup of metabolic byproducts and sustained tension triggers specific molecular signals that turn on protein-building machinery. These signals activate two key pathways that work together to increase the production of muscle proteins, and this activation lasts longer than with heavier weights and fewer reps.
What the research says
1 studyWhen young men lift light weights until they can’t do another rep, their muscles send stronger growth signals than when lifting heavy weights for fewer reps — because doing more reps and getting tired activates the body’s muscle-building switches more effectively.
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.