The Claim
In transgender women undergoing long-term gender-affirming hormone therapy, hemoglobin levels and peak oxygen consumption normalized to body weight or lean mass do not differ significantly from those observed in cisgender women, suggesting that oxygen-carrying capacity and aerobic performance may reach levels comparable to cisgender females despite prior male puberty.
What the research says
Roughly balanced
Support and challenge are close. The picture may shift as more studies come in.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Trans women on long-term hormone therapy might have similar oxygen levels and fitness as cis women, even after going through male puberty.
See the scientific wording
In transgender women on long-term gender-affirming hormone therapy, hemoglobin levels and VO2 peak corrected for body weight or lean mass are not statistically different from cisgender women, indicating that oxygen-carrying capacity and aerobic performance may align with cisgender female levels despite prior male puberty.
What the research says
1 studyStudy: The Impact of Gender-Affirming Hormone Therapy on Physical Performance
The study found that after hormone therapy, transgender women's blood oxygen levels and aerobic fitness (adjusted for weight) become similar to cisgender women's, which supports the claim.
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.