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Feminism: Sex and gender discussions

Save female sports evidence thread

133 replies

Helleofabore · 14/08/2024 14:13

I am conscious that the Break it Down for me thread is nearly full. I am therefore hoping that this thread can be an archive thread just for the sports evidence that we can all access and refer to. Now that MNHQ has given us the option for saving threads so we can find them easily, I figure it is a good time.

Please post studies, papers, media articles that pull together references, or informative articles, tweets, videos. Just on sport, the latest policies around sport.

I don't want to be the thread police, but ask that we keep this free of discussion. Can I ask that if you want to discuss something you see here, you start a thread to do so?

Because I would like this to be just information stashed so that people can find the links easily so they also know where to start. And getting into discussion on this thread will mean it will fill up.

Thanks.

OP posts:
Thread gallery
47
Helleofabore · 14/08/2024 15:54

DANISH STUDY ON TESTOSTERONE SUPPRESSION

Study released 14th December 2022 from Nederlands and Denmark.

pubmed.ncbi.nlm.nih.gov/36534950/

Lisanne H P Houben, Maarten Overkamp, Puck van Kraaij, Jorn Trommelen, Joep G H van Roermund, Peter de Vries, Kevin de Laet, Saskia van der Meer, Ulla R Mikkelsen, Lex B Verdijk, Luc J C van Loon, Sandra Beijer, Milou Beelen

Abstract

Purpose: To assess the effects of 20 weeks resistance exercise training with or without protein supplementation on body composition, muscle mass, muscle strength, physical performance and aerobic capacity in prostate cancer patients receiving androgen deprivation therapy (ADT).

Methods: Sixty prostate cancer patients receiving ADT were randomly assigned to perform 20 weeks of resistance exercise training with supplementation of 31 g whey protein (EX+PRO, n = 30) or placebo (EX+PLA, n = 30), consumed immediately after exercise and every night before sleep. A separate control group (CON, n = 36) only received usual care. At baseline and after 20 weeks, body composition (dual energy X-ray absorptiometry), muscle mass (computed tomography scan), muscle strength (1-repetition maximum strength tests), physical performance (Timed Up and Go Test, 30-second Chair Stand Test, Stair Climb Test), aerobic capacity (cardiopulmonary exercise test) and habitual dietary intake (food diary), were assessed. Data were analyzed using a two-factor repeated-measures ANOVA.

Results: Over time, muscle mass and strength increased in EX+PRO and EX+PLA and decreased in CON. Total fat mass and fat percentage increased in EX+PRO and CON, but not in EX+PLA. Physical performance did not significantly change over time in either group. Aerobic capacity was maintained in EX+PLA, while it decreased in EX+PRO and CON. Habitual protein intake (without supplements) averaged >1.0 g·kg body weight-1·day-1, with no differences over time or between groups.

Conclusions: In prostate cancer patients, resistance exercise training counteracts the adverse effects of ADT on body composition, muscle mass, muscle strength and aerobic capacity, with no additional benefits of protein supplementation.

Resistance Exercise Training Increases Muscle Mass and Strength in Prostate Cancer Patients on Androgen Deprivation Therapy - PubMed

In prostate cancer patients, resistance exercise training counteracts the adverse effects of ADT on body composition, muscle mass, muscle strength, and aerobic capacity, with no additional benefits of protein supplementation.

https://pubmed.ncbi.nlm.nih.gov/36534950/

OP posts:
Helleofabore · 14/08/2024 15:53

HEIGHT IN PUBERTY SUPPRESSED MALE PEOPLE

Trans girls grow tall: adult height is unaffected by GnRH analogue and estradiol treatment. This is still an advantage that these males continue to have despite ‘puberty blockers’. This is where future studies will start to focus on these cases.

Lidewij Sophia Boogers, Chantal Maria Wiepjes, Daniel Tatting Klink, Ilse Hellinga, Adrianus Sarinus Paulus van Trotsenburg, Martin den Heijer,
Sabine Elisabeth Hannema

published: 06 June 2022

academic.oup.com/jcem/advance-article/doi/10.1210/clinem/dgac349/6603101

Height SD score (SDS) during A, puberty suppression (PS), and B, gender-affirming hormone therapy (HT), in 3 different treatment groups (regular-dose estradiol, high-dose estradiol, and ethinyl estradiol [EE]).

Transgender Girls Grow Tall: Adult Height Is Unaffected by GnRH Analogue and Estradiol Treatment

AbstractContext. Transgender adolescents can receive gonadotropin-releasing hormone analogues (GnRH) and gender-affirming hormone therapy (GAHT), but littl

https://academic.oup.com/jcem/advance-article/doi/10.1210/clinem/dgac349/6603101

OP posts:
Helleofabore · 14/08/2024 15:51

HISTORY OF SEX TESTING IN THE OLYMPICS AND THE GROUP WHO SUCCESSFULLY CAMPAIGNED TO HAVE SEX TESTING DROPPED

www.nature.com/articles/gim2000258.pdf?origin=ppub&utm_medium=affiliate&utm_source=commission_junction&utm_campaign=CONR_PF018_ECOM_GL_PHSS_ALWYS_DEEPLINK&utm_content=textlink&utm_term=PID100045542&CJEVENT=f4d4c8630a0411ed831b01a80a1c0e11

Louis J. Elsas ,MD' , Arne Ljungqvist, MD', Malcolm A. Ferguson-Smith, MA,FRCP, JoeLeigh Simpson, MD', Myron Genel, MD5, Alison S. Carlson ,BA, Elizabeth Ferris, MBBS', Albert de la Chapelle, MD, Anke A. Ehrhardt, phD

"On-site gender verification has since been found to be highly discriminatory, and the cause of emotional trauma and social stigmatization for many females with problems of intersex who have been screened out from competition. Despite compelling evidence for the lack of scientific merit for chromosome-based screening for gender, as well as its functional and ethical inconsistencies, the IOC persisted in its policy for 30 years."

"The coauthors of this manuscript have worked with some success to rescind this policy through educating athletes and sports governors regarding the psychological and physical nature of sexual differentiation, and the inequities of genetic sex testing."

http://www.nature.com/articles/gim2000258.pdf?origin=ppub&utm_medium=affiliate&utm_source=commission_junction&utm_campaign=CONR_PF018_ECOM_GL_PHSS_ALWYS_DEEPLINK&utm_content=textlink&utm_term=PID100045542&CJEVENT=f4d4c8630a0411ed831b01a80a1c0e11

OP posts:
Helleofabore · 14/08/2024 15:47

LONG TERM STUDY ON ADVANTAGES BY MALE ATHLETES ON OESTROGEN THERAPY

The Brazilian study.

bjsm.bmj.com/content/early/2022/09/01/bjsports-2021-105400.info

Cardiopulmonary capacity and muscle strength in transgender women on long-term gender-affirming hormone therapy: a cross-sectional study

Leonardo Azevedo Mobilia Alvares, Marcelo Rodrigues Santos, Francis Ribeiro Souza, Lívia Marcela Santos, Berenice Bilharinho de Mendonça, Elaine Maria Frade Costa, Maria Janieire Nazaré Nunes Alves, Sorahia Domenice

Conclusion

In this small cohort of non-athlete TW, who were previously exposed to male pubertal development and underwent long-term oestrogen therapy, we identified higher grip strength and VO2 peak levels than in non-athlete CW, but these same parameters were lower compared with non-athlete CM.

These findings add new insights to the sparse information available on a highly controversial topic about the participation of TW in physical activities. Future studies involving transgender athletes that account for and quantify variable exposure times to pubertal development and assess muscle cell metabolism are needed to elucidate the effects of long-term GAHT on TW sports performance.

And from Ross Tucker on this study

From Ross Tucker on this study above:

Over a decade (14.4 yrs average) of T-suppression, and TW have VO2max 20% higher, grip strength 19% higher & skeletal mass 40% than women. More evidence that male biology persists long after T is removed. Another piece of the same puzzle, albeit from a cross-sectional study.

The cross-sectional bit is important - the study hasn't (like over a dozen others) tracked people from Day zero onwards, so the differences are a 'snapshot' rather than a 'movie', if that makes sense? Means you don't know how those TW began, 14.4 yrs earlier, but the finding of quite large differences compared to women (20% or more) is striking, because a) they either began as typically representative of males, and lost some, but retained significant advantages vs women, or b) they began well below men, and lost hardly any advantages. In either case, the end point, over a decade later, is biological differences compared to women that will create performance implications. Of interest, the mass retention and VO2max advantage mean that relative VO2max (ml/kg/min) ends up similar, which means in some sports (weight-determined) the performance implication may differ - sometimes very large, sometimes smaller, as in some categories within endurance sports.

But zero? Unlikely, because cardio function, FFM & strength are greater. Important paper, showing striking biological 'persistence' 14 yrs on.
Two further thoughts on the study. First, the TW vs women differences in muscle mass and strength remain large (20%) after more than a decade of T suppression. One year vs ten, biology "persists". Second, add training to the mix and TW and women would obviously get stronger.

You could TRY to argue that women would get stronger relatively more than TW (you'd have a job on your hands to explain why this would be, but anyway). More likely is that the differences - TW vs women - would persist or even increase with the addition of training. What this study confirms is that non-trained TW retain biological differences with performance implications after 14 years of T suppression. You'd have to believe that W could make up these gaps with training to believe in fairness in sport. That is, trained W = non-trained TW = fair!

http://bjsm.bmj.com/content/early/2022/09/01/bjsports-2021-105400.info

OP posts:
Helleofabore · 14/08/2024 15:45

AUSTRALIAN SBS INSIGHT PROGRAM
Gender Games: Trans women and sport

This is quite a good discussion on transitioned males in sport done by Australia's SBS TV channel. It includes people like Jane Fleming (Olympic athletics champ), Deborah Acason (Commonwealth games female weighlifting champion and pioneer), Holly Lawford-Smith, Prof David Handelsman (Uni of Sydney) specialist in Testosterone, Dr Roslyn Carbon (part of the team developing UK Sports guidance), Mianne Baggar and Joanne Harper.

Overall, it showed just how much the inclusive side fall onto emotional manipulation in the face of overwhelming evidence that counters their claims.

- YouTube

Enjoy the videos and music that you love, upload original content and share it all with friends, family and the world on YouTube.

https://youtu.be/STX1GCxYEIc

OP posts:
annejumps · 14/08/2024 15:43

I was just about to ask whether pre-puberty boys have higher testosterone and a performance difference as compared to girls. I seem to recall Ross Tucker saying so.

Helleofabore · 14/08/2024 15:43

ETHICS IN SPORT : THE CANADIAN 'REVIEW' AND REBUTTAL

The rebuttal of Canadian Centre for Ethics in Sport ‘Transgender Women Athletes and Elite Sport: A Scientific Review’ has been released.

Here is the original:

www.cces.ca/sites/default/files/content/docs/pdf/transgenderwomenathletesandelitesport-ascientificreview-e-final.pdf

here is the rebuttal:

idrottsforum.org/wp-content/uploads/2022/11/devineetal221129.pdf

”When Ideology Trumps Science: A response to the Canadian Centre for Ethics in Sport’s Review on Transwomen Athletes in the Female Category”

Cathy Devine, Emma Hilton, Leslie Howe, Miroslav Imbrišević, Tommy Lundberg, Jon Pike

Independent Scholar; University of Manchester; University of Saskatchewan; Open University (UK); Karolinska Institutet

29 November 2022

This is good reading for anyone who wants some background. Although it is a long read.

Some highlights:

"Descriptive accounts tell us how things are. Normative accounts tell us how things ought to be. To answer the question: ‘is it fair for TW to compete in female sport?’ we need both."

and

"For example, the anonymous authors claim evidence showing that male advantage is lost after one year of testosterone suppression, while the two papers cited in support of this statement explicitly argue that male advantage is retained well beyond one year of suppression. In fact, a recent cross-sectional study (Mobilia Alvares et al, 2022) measuring the perfor- mance of transwomen suggests that the advantage may be maintained after 14 years of testosterone suppression." (p. 4-5)

And

"The Range Argument rests on a misunderstanding of fairness in sport. The same misunderstanding lies behind the repeated claim that it is wrong to compare TW with male athletes (‘cis’ men), and that they should be com- pared with female athletes (‘cis’ women). The difference is between the two conceptions of fairness in play: the ‘Advantage’ conception and the ‘Range’ conception. The Advantage view justifies our current categorisation into male and female sport, and so justifies the existence of women’s sport. The Range view does not justify the existence of women’s sport: rather, it would prescribe a sports category defined on the basis of some metric or set of metrics as a substitute for women’s sport – for example, tall sport and short sport. On the Advantage account of fairness, what matters is male advan- tage, so the appropriate comparison is between Transwomen and males to see whether there is retained male advantage. On the Range view, what mat- ters is whether TW are in the range of female athletes, so this prescribes that the appropriate comparison is with female athletes. This leads to the result that some TW metrics are within the female range. But the same objection applies: what matters is the removal of male advantage, not whether some males are (for example) shorter than some females." p 5-6

and

"Sports categories do not exist to account for undertraining and poor fitness; there are plenty of opportunities at the recreational level for TW to join other equally under- trained and unfit males." p 7

Also on p 7

"The CCES write in the conclusion of their Executive Summary (9): ‘There is no firm basis available in evidence to indicate that trans women have a consistent and measurable overall performance benefit after 12 months of testosterone suppression.’ If that really were the case, then the inclusion of TW would not be prudent. Suppose it turns out that they do have a sig- nificant advantage over women (which is actually the case), then, having included TW would have been unfair (and unsafe) for women. The prudential principle is this: if we lack conclusive evidence, but a change of policy could lead to bad outcomes, then we should not implement such a policy – until we have such evidence. The paper equivocates between three claims: that there is no evidence of advantage, that there is no advantage, and that there is advantage (but fairness must be traded off against inclusion). This is deeply confused, but we note here that absence of evidence does not support a policy of including possible male advantages in female sport."

then

"Furthermore, what is supposed to happen once we have achieved ‘rep- resentative levels’ of participation? Should we then resurrect the fairness criterion and exclude all TW? With zero participation, we would have to open the female category again for TW, and this ‘game’ (close, open, close, open) could go on forever." p 8

and

"The other view is to say that, because the sociocultural disadvantages faced by TW are ‘special’ and differ fundamentally from the disadvantages of other athletes, sports authorities should accede to the demand that they be included in female sport. On this line of argument, inclusion of TW in female sport is not fair, but is an act of solidarity with them. This justification, though, must attend to the opposite claim: that because inclusion is not fair, it amounts to an act of animosity towards female athletes." p 10

Page 12 & 13 bring in sex testing and how olympic women athletes were all in support of it but that it was ignored.

And how sexism is rife.

"Similarly, the voices of black elite female athletes from the Global South without these XY DSDs/VSDs, are ignored in the name of anti-racism, in fa- vour of advocacy for athletes who do have them. This completely disregards the black elite female athletes without these congenital conditions from the Global South, who are well represented in, for example, elite athletics, and depend on female categories and the World Athletics DSD regulations for their success"

OP posts:
Helleofabore · 14/08/2024 15:40

MALE CHILDREN ADVANTAGES IN SPORT

New study released on sex differences between male and female children under 11 years old.

Sex-based differences in track running distances of 100, 200, 400, 800, and 1500m in the 8 and under and 9–10-year-old age groups

Gregory A Brown, Brandon S Shaw, Ina Shaw

5th February 2024

https://onlinelibrary.wiley.com/doi/10.1002/ejsc.12075

"In conclusion, although some have stated that sex-based differences in athletic performance do not arise until puberty, the present data indicate that in the 8 and under and 9–10-year-old age groups males run faster than females in distances of 100, 200, 400, 800, and 1500m. While some females in these age groups are faster than some males, the average male finalists are faster than the average female finalists, and the fastest males are faster than the fastest females. As running is a key component of many sports, these sex-based differences between prepubertal males and females should be considered when sport governing bodies and policy makers consider the issue of sex-based sporting categories"

OP posts:
Helleofabore · 14/08/2024 15:39

MALE CHILDREN ADVANTAGES IN SPORT

Danish study on VO2 max and LBM in children from age 6

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1725036/pdf/v039p00725.pdf

Maximum oxygen uptake and objectively measured physical activity in Danish children 6-7 years of age: the Copenhagen school child intervention study

Eigberg, Hasselstrom, Gronfeldt, Friberg, Svensson, Anderson
October 2005

Objectives: To provide normative data on maximum oxygen uptake (Vo(2)max) and physical activity in children 6-7 years of age and analyse the association between these variables.

Methods: Vo(2)max was measured in 366 boys (mean (SD) 6.8 (0.4) years of age) and 332 girls (6.7 (0.4) years of age) from preschool classes in two suburban communities in Copenhagen, during a progressive treadmill exercise. Habitual physical activity was measured with accelerometers.

Results: Boys had higher Vo(2)max both in absolute values (1.19 (0.18) v 1.06 (0.16) litres/min (+11%), p<0.001) and relative to body weight (48.5 (6.0) v 44.8 (5.6) ml/kg/min (+8%); p<0.001) than girls. The difference in Vo(2)max between boys and girls decreased to +2% when expressed relative to lean body mass (LBM). Absolute Vo(2)max was related to LBM, body mass, and stature (all p<0.001). Boys were more physically active than girls (mean counts +9.4%, p<0.001), and even when boys and girls with the same Vo(2)max were compared, boys were more active. The difference in physical activity between the sexes was higher when sustained activity of higher intensity was compared.

Conclusions: Vo(2)max is higher in boys than girls (+11%), even when related to body mass (+8%) and LBM (+2%). Most of the difference in Vo(2)max relative to body mass was explained by the larger percentage body fat in girls. When boys and girls with the same Vo(2)max were compared, boys engaged in more minutes of exercise of at least moderate intensity.

___

Australian children

https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=021cccdaed57d120bb05bac71c05ee82b0c5b315

Greek ( for those who have access)

https://www.tandfonline.com/doi/full/10.1080/17461391.2015.1088577?needAccess=true

This link has many links and is particularly good for children’s advantages.

https://www.ultraphysical.us/p/beyond-t-sex-based-differences-in

Gregory Brown, Professor Exercise Science (primarily Exercise Physiology) at the University of Nebraska at Kearney.

bjsports-2011-090218.indd

https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=021cccdaed57d120bb05bac71c05ee82b0c5b315

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Helleofabore · 14/08/2024 15:37

This is the coach who has been said to have scouted for athletes in South Africa, including Caster Semenya.

Ekkart Arbeit is the sports coach who was coaching the East German women, then came to Athletics Australia in the late 90s ( 1997?) in lead up to Sydney 2000 Olympics to coach the women but they rescinded his contract in 1998. Arbeit eventually ended up as the coach for South Africa in the mid 2000s.

He is a testosterone expert.

https://www.abc.net.au/news/2003-04-22/olympic-champion-hires-former-east-german-drug/1841668

https://www.irishtimes.com/sport/further-checks-on-coach-ordered-1.114105

Further checks on coach ordered

Australian sports minister Andrew Thomson has asked Athletics Australia to make further checks on former East German trainer …

https://www.irishtimes.com/sport/further-checks-on-coach-ordered-1.114105

OP posts:
Helleofabore · 14/08/2024 15:35

ARTICLE ABOUT TESTOSTERONE AND FAIRNESS HILTON HANDELSMAN

https://archive.ph/C84Be

What science tells us about transgender women athletes

Hilton and Handelsman 9 May 2022, The Australian

“Men are, on average, bigger, faster, stronger and have greater endurance than women,” Hilton and Handelsman wrote. “While there is overlap between men and women, at the elite sporting levels the differences are stark. These physical advantages are caused by the dramatic surge in testosterone — a rapid 20-30-fold rise over unchanged female levels — during male puberty. Cumulative effects of male testosterone exposure over years produce a lasting uplift of larger and stronger muscles and bones, higher capacity cardiovascular systems and a higher hemoglobin level.”

“In individual sports such as athletics and swimming, world records and winning Olympic performances show men have a 10-20 percent advantage over women, with even higher advantages in certain sporting skills (pitching, fast bowling, punching, yanking, pulling) of 50 percent to over 100 percent,”

“This explains why female world records are surpassed by thousands of males, including by boys aged 14-15 years old in early to mid-puberty”.

“Importantly, female athletes should not be forced to assume the burden of competing against unfair male physical advantages in the name of inclusion. This would risk creating another generation of female athletes with lifelong career loss and personal grievances resembling a very different form of unfair disadvantage such as when Australian and other sportswomen faced doped East German athletes in the 1980s.”

OP posts:
Helleofabore · 14/08/2024 15:27

NON-BINARY INCLUSION

Performance of non-binary athletes in mass-participation running events

bmjopensem.bmj.com/content/bmjosem/9/4/e001662.full.pdf

John Armstron, Alice Sullivan, George M Perry

December 21, 2023

Our results illustrate the value of data on sex and gender identity.

The differential between natal male and natal female performances is better explained by differences in sex than differences in gender identity, as this differential persists for our non-binary cohort. This provides evidence against the theory that an individual’s gender-identity plays a significant role in these disparities in addition to their sex.

Our exploratory analysis indicates that non-binary athletes may have slower race times than other athletes once one controls for sex and age, but one would wish to confirm this with a larger data set as this is on the boundary of statistical significance. Data gathered on gender non-conforming college students by the American College Health Association suggest that gender non-conforming students are less likely to meet exercise recommendations, have increased rates of obesity and have higher rates of physical and mental health issues; these factors affect levels of fitness and training status. A complex range of factors associated with non-binary status could account for any association with slower race times. We do not wish to suggest causality in either direction.”

OP posts:
Helleofabore · 14/08/2024 15:25

VIDEO ON INCLUSION IN SPORTS BY FAIRPLAY FOR WOMEN

The Inclusion Delusion
with Sharron Davies, Mara Yamauchi, Daley Thompson & Dr Emma Hilton

It is only 6 minutes.

- YouTube

Enjoy the videos and music that you love, upload original content and share it all with friends, family and the world on YouTube.

https://youtu.be/KFQLkDHqf84?feature=shared

OP posts:
Helleofabore · 14/08/2024 15:22

NZ REVIEW ON WHY TESTOSTERONE SUPPRESSION IS NOT A FIX FOR MALE PUBERTAL ADVANTAGES

The New Zealand review of whether IOC 10nm/l would work to reduce advantage. It is actually rather a good explainer.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9331831/#B44-ijerph-19-09103

Transwoman Elite Athletes: Their Extra Percentage Relative to Female Physiology

Alison K Heather, Stacy T. Sims, Academic Editor and Christopher T. Minson, Academic Editor

August 2022

Abstract:

There is increasing debate as to whether transwoman athletes should be included in the elite female competition. Most elite sports are divided into male and female divisions because of the greater athletic performance displayed by males. Without the sex division, females would have little chance of winning because males are faster, stronger, and have greater endurance capacity. Male physiology underpins their better athletic performance including increased muscle mass and strength, stronger bones, different skeletal structure, better adapted cardiorespiratory systems, and early developmental effects on brain networks that wires males to be inherently more competitive and aggressive. Testosterone secreted before birth, postnatally, and then after puberty is the major factor that drives these physiological sex differences, and as adults, testosterone levels are ten to fifteen times higher in males than females. The non-overlapping ranges of testosterone between the sexes has led sports regulators, such as the International Olympic Committee, to use 10 nmol/L testosterone as a sole physiological parameter to divide the male and female sporting divisions. Using testosterone levels as a basis for separating female and male elite athletes is arguably flawed. Male physiology cannot be reformatted by estrogen therapy in transwoman athletes because testosterone has driven permanent effects through early life exposure. This descriptive critical review discusses the inherent male physiological advantages that lead to superior athletic performance and then addresses how estrogen therapy fails to create a female-like physiology in the male. Ultimately, the former male physiology of transwoman athletes provides them with a physiological advantage over the cis-female athlete.

Conclusion:

Testosterone drives much of the enhanced athletic performance of males through in utero, early life, and adult exposure. Many anatomical sex differences driven by testosterone are not reversible. Hemoglobin levels and muscle mass are sensitive to adult life testosterone levels, with hemoglobin being the most responsive. Studies in transgender women, and androgen-deprivation treated cancer patients, show muscle mass is retained for many months, even years, and that co-comittant exercise mitigates muscle loss. Given that sports are currently segregated into male and female divisions because of superior male athletic performance, and that estrogen therapy will not reverse most athletic performance parameters, it follows that transgender women will enter the female division with an inherent advantage because of their prior male physiology.

The current IOC regulations allow transwomen athletes to compete if testosterone levels have been lowered to <10 nmol/L for 12 months prior to competition. While this begins to address the advantageous effects of circulating testosterone on athletic performance, it does not take into account the advantage afforded by testosterone exposure prior to transitioning. The existing data suggests that lowering testosterone to less than 10 nmol/L for 12 months decreases muscle mass but not to biological female levels and despite the decrease in mass, muscle strength can be maintained, especially if concurrently exercising. Estrogen therapy does not affect most of the anatomical structures in the biological male that provide a physiological benefit. Hemoglobin levels are lowered by estrogen therapy, and consequently, maximum aerobic effort may be lower, but this parameter will only be manifested if testosterone levels are suppressed to levels within the biological female range and maintained for extended periods of time. Reported studies show it is difficult to continuously suppress testosterone in transgender women. Given that the percentage difference between medal placings at the elite level is normally less than 1%, there must be confidence that an elite transwoman athlete retains no residual advantage from former testosterone exposure, where the inherent advantage depending on sport could be 10–30%. Current scientific evidence can not provide such assurances and thus, under abiding rulings, the inclusion of transwomen in the elite female division needs to be reconsidered for fairness to female-born athletes.

This dailymail link discusses it.

https://www.dailymail.co.uk/health/article-12111455/The-trans-advantage-womens-sports-explained.html

The 'trans advantage' in women's sports explained

A major review published by the US National Institutes of Health (NIH) last August suggests early exposure to testosterone means trans women have physiological benefits over biological women.

https://www.dailymail.co.uk/health/article-12111455/The-trans-advantage-womens-sports-explained.html

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Helleofabore · 14/08/2024 15:17

PAPER FROM ENDOCRINE SOCIETY REGARDING IMPORTANCE OF CONSIDERING SEX AS A UNIQUE VARIABLE

Just for those who need to know the difference

A link to a recent paper from the Endrocrine Society.

Considering Sex as a Biological Variable in Basic and Clinical Studies: An Endocrine Society Scientific Statement

Aditi Bhargava, Arthur P Arnold, Debra A Bangasser, Kate M Denton, Arpana Gupta, Lucinda M Hilliard Krause, Emeran A Mayer, Margaret McCarthy, Walter L Miller, Armin Raznahan, Ragini Verma

Published: 11 March 2021

academic.oup.com/edrv/advance-article/doi/10.1210/endrev/bnaa034/6159361#.YG386Eqj1v4.twitter

Some key points:

-Sex is an important biological variable that must be considered in the design and analysis of human and animal research. The terms sex and gender should not be used interchangeably. Sex is dichotomous, with sex determination in the fertilized zygote stemming from unequal expression of sex chromosomal genes. By contrast, gender includes perception of the individual as male, female, or other, both by the individual and by society; both humans and animals have sex, but only humans have gender.

-The classical biological definition of the 2 sexes is that females have ovaries and make larger female gametes (eggs), whereas males have testes and make smaller male gametes (sperm); the 2 gametes fertilize to form the zygote, which has the potential to become a new individual. The advantage of this simple definition is first that it can be applied universally to any species of sexually reproducing organism. Second, it is a bedrock concept of evolution, because selection of traits may differ in the 2 sexes. Thirdly, the definition can be extended to the ovaries and testes, and in this way the categories—female and male—can be applied also to individuals who have gonads but do not make gametes.

-many people cannot make either eggs or sperm, yet are recognized as female or male based on other physical characteristics; people who do not have either ovaries or testes are rare. For individuals that possess a combination of male- and female-typical characteristics, these clusters of traits are sufficient to classify most individuals as either biologically male or female.

-Biological sex is dichotomous because of the different roles of each sex in reproduction. For scientific research, it is important to define biological sex and distinguish it from other meanings.

There are plenty of interesting points in this paper.

However, it does focus too on the importance of clarity around male and female for medical purposes and treatment outcomes.

Simplified view of the factors influencing sex differences in the brain. Three broad groups of factors influence the sexually dimorphic brain, as indicated by the broad, colored arrows. 1) Genes and genetic factors that influence the brain include both...

Considering Sex as a Biological Variable in Basic and Clinical Studies: An Endocrine Society Scientific Statement

Abstract. In May 2014, the National Institutes of Health (NIH) stated its intent to “require applicants to consider sex as a biological variable (SABV) in

https://academic.oup.com/edrv/advance-article/doi/10.1210/endrev/bnaa034/6159361#.YG386Eqj1v4.twitter

OP posts:
Helleofabore · 14/08/2024 15:16

MENSTRUAL CYCLE IMPACTS ON FEMALE SPORTS

An article about the connection of injury with menstrual cycle.

https://www.economist.com/science-and-technology/2021/06/24/acl-injuries-are-a-growing-problem

Plug this into archive dot is for the full version if the link below does not work.

https://archive.is/cH8ax

June 18th 2021

One of the most curious features of ACL injuries, though, is that they afflict women far more often than men—as much as eight times more, some investigations suggest. Why this might be is the subject of intensive research. But a clue lies in an apparent connection with the menstrual cycle.

A study published in 2013, of a group of women skiers in the Alps, for example, found that those in the pre-ovulatory stage of the cycle were more than twice as likely to suffer an ACL tear than were those in the post-ovulatory stage. A four-year survey of 113 female England footballers, published in March, also found a clear correlation. Muscle and tendon injuries were far more common in the late follicular phase of the cycle, just prior to ovulation, than in the other phases.

The reason for this menstrual-cycle link is unclear. The ACL has oestrogen receptors, which might help to explain what is happening. But it is not unique among ligaments in this, and the receptors’ job is, in any case, obscure. Levels of oestrogen in the body do spike just before ovulation—the point when tear-frequency rises—but uncertainty remains about the exact link.

Other contributory factors to women’s higher ACL tear rate may be female body shapes and movement patterns. Compared with men, women have wider hips, more inverted knees and “over-dominant“ quad muscles (meaning that the quadriceps femoris muscle group in front of the thigh bone is relatively stronger than the hamstring group behind it). All these factors put pressure on the elaborate workings of the knee joint. Women also tend to land in a more flat-footed manner than men do, and to pivot more awkwardly.

ACL injuries are a growing problem

And one that particularly afflicts women

https://www.economist.com/science-and-technology/2021/06/24/acl-injuries-are-a-growing-problem

OP posts:
Helleofabore · 14/08/2024 15:13

PAPER ON MEANINGFUL COMPETITION BY JON PIKE

This paper goes through what competitive advantage means. Jon Pike is a Philosophy lecturer for the Open University and so this is a counter to the philosophical discussion around 'inclusion'. An argument successfully used by Harper (2015?) and McKinnon (2019) in discussions with the IOC, or so I believe.

The PHELPS argument for competitive advantage is referred to in this tweet which refers to the page numbers in the paper:

”The argument that Khelif's advantage does not matter because it is 'small' and 'like Michael Phelps's advantages' is false.”

I mean, 'false' as in 'refuted', 'demonstrated to be wrong’.

”Here you go - see particularly pp. 8-15:”

https://x.com/runthinkwrite/status/1819323178973331569

Why ‘Meaningful Competition’ is not fair competition

6th Feb 2023

www.tandfonline.com/doi/full/10.1080/00948705.2023.2167720

ABSTRACT

In this paper I discuss a new conception that has arrived relatively recently on the scene, in the context of the debate over the inclusion of transwomen (hereafter TW) in female sport. That conception is ‘Meaningful Competition’ (hereafter MC) – a term used by some of those who advocate for the inclusion of TW in female sport if and only if they reduce their testosterone levels. I will argue that MC is not fair.

I understand MC as a substitute concept, as an attempt to substitute for the perfectly serviceable concept of fair competition. It is an attempt at conceptual engineering that should be resisted. This is important because some International Federations have accepted MC as good coin, and the underlying theory of MC, which I explicate for the first time, underpins the stance taken by the IOC (International Olympic Committee) in its Framework Document.

To establish that the inclusion of TW in female sport meets the criteria of MC in the sense I explicate here, does not show that the inclusion of TW in female sport is fair. Such inclusion is not fair, and the proper currency of sport is fair competition. ‘Meaningful Competition’, on the other hand, is a snare and a delusion.

(note: my paragraph breaks to make it easier to read quickly, sorry Jon)

x.com

https://x.com/runthinkwrite/status/1819323178973331569

OP posts:
Helleofabore · 14/08/2024 15:02

RE: PCOS & FEMALE PEOPLE WITH HIGHER TESTOSTERONE

This is from a PCOS advocate on twitter.

PCOS raises female testosterone to up to 5.5 nmol/L (and above 4 can cause serious issues).
5-ARD raised Caster's testosterone to 21 nmol/L.

twitter.com/NathanielHart72/status/1550916276490477568?s=20&t=E8muLvV5kUEpbPeemz8zwQ

Plus there is this:

twitter.com/seaningle/status/1537480540068225031?s=20&t=E8muLvV5kUEpbPeemz8zwQ

Sean Ingle (Guardian sports journalist) mentioned this

The latest scientific publications clearly demonstrate that the return of markers of endurance capacity to "female level" occurs within six to eight months under low blood testosterone, while the awaited adaptations in muscle mass and muscle strength/power take much longer (two years minimum according to a recent study). Given the important role played by muscle strength and power in cycling performance, the UCI has decided to increase the transition period on low testosterone from 12 to 24 months. In addition, the UCI has decided to lower the maximum permitted plasma testosterone level (currently 5 mol/L) to 2.5 mol/L. This value corresponds to the maximum testosterone level found in 99.99% of the female population.

Plus this discusses the ranges

^https://onlinelibrary.wiley.com/doi/epdf/10.1111/sms.14581^

The International Olympic Committee framework on fairness, inclusion and nondiscrimination on the basis of gender identity and sex variations does not protect fairness for female athletes

In adulthood, circulating testosterone concentrations do not come close to overlapping between females (0.1–1.7 nmol/L) and males (7.7–29.4 nmol/L).

plus that Hoovlet post with handy charts in the tweet

https://x.com/hoovlet/status/1819017510005407984

Confirmed. No overlap in T levels between healthy men and women, and rarely in people with atypical levels”.

Below I'll include some info from my book on T and sex diffs. First is an illustration of the combined data from a meta-analysis of studies on a healthy population (by David Handelsman), and another on T levels in ppl with medical conditions/DSDs (by Richard Clark). I've also included my text description of the data. The original illustration is from Doriane Coleman's excellent Sex in Sport article (link is in the graphic). She let me adapt it for my book but hers is clearer!

If you are using the term 'woman with high testosterone', plus check your sources and don't spread misinformation. Female people with PCOS, women, DO NOT HAVE male levels of testosterone!

Save female sports evidence thread
Save female sports evidence thread
Save female sports evidence thread
OP posts:
StellaGreen · 14/08/2024 15:00

Could someone link the translation from French to English of the tércieme of Imane’s trainer please?

OP posts:
ellenback21 · 14/08/2024 14:54

More from David J Handelsman:
Toward a Robust Definition of Sport Sex
Pub 05 April 2024

Proposes that "sports sex is primarily defined by an individual's experience of male puberty"
Sport Sex Classification table:

https://academic.oup.com/view-large/459738592

Helleofabore · 14/08/2024 14:48

ACADEMIC PAPER IN RESPONSE TO THE IOC FRAMEWORK

This a good paper for pulling a lot of the information available up until the end of 2023 together.

The IOC framework was released in November 2021, after there was so much pushback about male athletes such as Hubbard (and historically Semenya).

https://onlinelibrary.wiley.com/doi/epdf/10.1111/sms.14581

The International Olympic Committee framework on fairness, inclusion and nondiscrimination on the basis of gender identity and sex variations does not protect fairness for female athletes

February 1, 2024

Tommy R. Lundberg, Ross Tucker, Kerry McGawley, Alun G. Williams, Grégoire P. Millet, Øyvind Sandbakk, Glyn Howatson, Gregory A. Brown, Lara A. Carlson, Sarah Chantler, Mark A. Chen, Shane M. Heffernan, Neil Heron, Christopher Kirk, Marie H. Murphy, Noel Pollock, Jamie Pringle, Andrew Richardson, Jordan Santos-Concejero, Georgina K. Stebbings, Ask Vest Christiansen, Stuart M. Phillips, Cathy Devine, Carwyn Jones, Jon Pike, Emma N. Hilton

Perspectives:

The IOC framework on fairness, inclusion and nondiscrimination on the basis of gender identity and sex variations is misaligned with current scientific and medical evidence and offers insufficient protection of fair competition for female athletes within a female category. Also, it does not adequately engage female athletes, who are primary stakeholders in their sport. Male pubertal development results in large performance advantages in athletic sports, which necessitates a female category that excludes male advantages, to ensure equal opportunity through fair competition for female athletes at all levels of sport. There is currently no evidence that testosterone suppression in transgender women can reverse male development and negate male advantages. In contrast, there is convincing evidence that the male advantage persists even when testosterone is suppressed. As a result, sports face the uncomfortable reality that the inclusion of transgender women in female sports categories cannot be reconciled with fairness, and in some instances safety, for females in athletic sports. The IOC must reconsider its framework and revise the 10 principles to reflect scientific evidence and fundamental principles of fair competition. We also recommend implementing a system to enable female stakeholders to be consulted in this matter and to have their voices heard, recognized, and valued.

OP posts:
zibzibara · 14/08/2024 14:44

Excellent idea for a thread and thank you for all the resources you posted to seed it with!

Some websites that help illustrate the extent of males competing in women's sport:

www.shewon.org

www.hecheated.org

A visual depiction of male physical advantage in sports, comparing teenage boys to elite female athletes:

www.boysvswomen.com

She Won banner: Selina Soule and Alanna Miller; picture attributed to Alliance Defending Freedom

List of Female Athletes by Sport | She Won

This website is dedicated to archiving the achievements of female athletes who were displaced by males in women’s sporting events.

http://www.shewon.org

Helleofabore · 14/08/2024 14:43

DR EMMA HILTON ON THE GOLD REPORT

Dr Hilton is speaking about DSDs and sports in general. This is another excellent general information video and well worth watching the whole hour.

The Gold Report on YouTube ‘The BBC is lying'.

The BBC is Lying: Olympic Boxer Is NOT A Woman - Dr. Emma Hilton (4K) | heretics. 80

- YouTube

Enjoy the videos and music that you love, upload original content and share it all with friends, family and the world on YouTube.

https://youtu.be/_9rynD9KlU0

OP posts: