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Old 05-10-2019, 11:55 AM
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Originally Posted by x-ray vision View Post
Do hemoglobin levels become equal?
I found the following:
The hemoglobin, hematocrit, and RBC number are all seen to decrease during hormone therapy in transgender women. A previous study of 55 transgender women3 showed that hemoglobin levels decreased significantly from cis-gender male levels to be not significantly different from cis-gender female hemoglobin. With a larger patient group, we were able to confirm this previous finding of decreased hemoglobin, but transgender women’s hemoglobin levels are still significantly different from individuals with sex-assigned female at birth (Figure 2).

Why this matters:
Jamie Pringle, a physiologist who has coached many world and Olympic champions, says: “The most consistent observation about the difference is that women have lower total mass of haemoglobin in their blood, compared to men, and less blood in total. This means less capacity to transport oxygen in the blood, which, when combined with the heart’s ability to pump that blood, and the muscle’s capacity to extract the oxygen from it, is a key determinant of aerobic fitness and endurance.”