The Claim
Activin A is the strongest individual biomarker associated with reduced physical function across multiple measures—including SPPB, gait speed, chair rise, and 400-m walk—in older adults with mobility limitations, with a correlation coefficient of −0.37.
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 older adults with mobility limitations, higher levels of Activin A are consistently linked to worse performance on tests of physical function, including walking speed, standing from a chair, and walking 400 meters, with a measurable statistical relationship.
See the scientific wording
Activin A is the strongest individual biomarker associated with reduced physical function across multiple measures—including SPPB, gait speed, chair rise, and 400-m walk—in older adults with mobility limitations, with a correlation coefficient of −0.37.
Aging causes cells to become senescent and release activin A, which blocks muscle growth and triggers muscle breakdown. This weakens muscles, slows movement, and reduces endurance, leading to poorer performance in walking, standing, and balance tests.
What the research says
1 studyIn older adults with trouble walking or standing up, the blood protein activin A is more strongly linked to poor movement than any other biomarker the scientists checked — it’s the best single sign they found.
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.