The following conclusions may be drawn from this discussion about MTF post-pubertal
transitioned athletes.
Most physiologic and anatomic differences (muscle mass and development, testosterone
levels, bone density, red blood cell levels, muscle-to-fat ratio) between men and women
are reversed by complete transition (as is required by the Stockholm Consensus).
o Very little scientific evidence proving corresponding changes in athletic
performance exists. Therefore, it cannot be said from a proven scientific basis or
with complete certainty that male athletic advantages are completely neutralized
by completed transgender transition.
Heart and lung capacity does not likely reverse completely, but it is uncertain if this
confers an advantage and to what degree.
Aptitude in motor skills is assumed to be no different for pre-pubertal transitions, but is
likely different for post-pubertal transitions, and, again, it is uncertain if this confers an
advantage and to what degree.
o An athlete may be at a disadvantage in this area if having to re-learn how to use
muscles that are now smaller and weaker than before a transition.
Two aspects of the male skeleton present additional issues and may create possible
advantages.
o One change that cannot be reversed hardly at all is male skeletal morphology.
This may result in greater forces generated by muscles over a male skeleton.
o Once change that cannot be completely reversed is male center of gravity. This
may contribute to generating greater striking forces when standing and also create
a different weight distribution when on the mat.
o These two skeletal difference may result in a fighting style most female-by-birth
athletes are unaccustomed to.
The degree to which these any or all of these possible advantages may exist or be
significant is as yet unknown and unproven.
At this time there are no studies that I know of that compare these specific issues. Ideally,
someday we could have enough transgender combat arts athletes to comprise a large academic
study, but that is not likely to happen.
For there to be no advantage for MTF transgender athletes in combat arts per se (not necessarily
other sports), every single variable listed above would have to ultimately pan out to be to “no
advantage.” Given the relatively high number of variables, this is highly unlikely. Then of
course, if there is a cumulative advantage to them, whether it is significant or not, is another
issue that is not easily resolved.