The Claim
After resistance training, whole body protein turnover increased by approximately 10% in younger individuals but remained unchanged in older individuals, while myofibrillar proteolysis, as measured by urinary 3-methylhistidine excretion, showed no change in either group.
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.
After resistance training, younger people experienced a 10% increase in overall protein turnover, while older people did not. The rate of muscle breakdown, measured by a specific urinary marker, did not change in either group.
See the scientific wording
Whole body protein turnover increased by approximately 10% only in the younger group after resistance training, while myofibrillar proteolysis, measured by urinary 3-methylhistidine excretion, was unchanged in both groups, suggesting differential systemic metabolic responses to training by age.
After lifting weights, younger people's muscles send stronger signals to activate protein building throughout the body, which increases overall protein use. Older people's muscles do not send these signals as strongly, so their bodies do not increase overall protein use, even though muscle breakdown stays the same in both groups.
What the research says
1 studyAfter lifting weights, younger people’s bodies started using protein more actively overall, but older people’s didn’t — and neither group broke down more muscle, as shown by urine tests. This suggests aging changes how the body reacts to exercise.
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.