Jamie Langley Profile picture
Aug 7, 2021 10 tweets 5 min read Read on X
@WorldAthletics time for a periodic review of the DSD regulations which currently restrict 46XY female athletes who have testes & testosterone levels in the male range (7.7 - 29.4nmol/L) currently only restricting participation in events over the 400m-1500m.

Thread 1/
The performance benefits of testosterone do not discriminate between running distances.

On average males have a performance benefit of 11.2% (± 1. 25) across all running events & 19.0% (± 2.57) for all jumping events.

ncbi.nlm.nih.gov/pmc/articles/P…

2/
The gender gap exists across all running distances as shown by Thibault et al (2010) study showsthe smallest margin in running events of 6.5% in the 100m but the largest difference 13.96% I the 4x100m.

ncbi.nlm.nih.gov/pmc/articles/P…

3/
The gender gap in performance is present across all world records is 10.0% ±2.94 between men & women for all events. 

The gap ranges from 5.5% in 800m freestyle, 7% for speed skating, 8.7% cycling, 10.7% in running, & 18.8% in long jump.

Testosterone does not discriminate.

4/
The #Tokyo2020 #Olympics witnessed two extremes of DSD competing in running events.

Mboma & Masilingi in the 200m & Niyonsaba competing in the 10,000m.

5/
On 2nd July it was reported Mboma & Masilingi both only 18 were illegible to compete in the women's 400m. This was reported July 20 days prior to the start of the Tokyo Olympics.

Both Mboma & Masilingi were able to qualify for the Tokyo Olympics in this short window.

6/
Mboma won the Olympic silver medal over the 200m at the age of 18 after running just three 200m races prior to the Olympics.

Masilingi also 18 finished 6th in the 200m final.

7/
On the opposite end of the spectrum Niyonsaba who won the silver medal at the Rio Olympic 800m qualified for the Olympics in both the 5,000m & 10,000m.

She finished 5th in the 10,000m setting a National a Record of 30.41mins.

8/
The ability of some DSD athletes to transition between race distances is indicative of a performance advantage.

What other athlete in history has won an Olympic medal in the 800m with a range of finishing 5th in the 10,000m?

Time for World Athletics to review their policy.
Unfortunately for fair sport for female athlete's discrimination against DSD athlete's is required as stated by CAS.

10/end

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More from @Jamie_langley1

Sep 25, 2023
Is Assefa a super responder to ‘super shoes’?

What does the scientific literature tell us about the effects of super shoes on running economy and race performance? Let’s investigate.

Long thread 🧵 Image
*** Disclaimer***

Without directly testing Assefa in the laboratory we can not determine the effect of super shoes on her running economy and other physiological markers. However, we can explore what the academic literature may suggest is possible and/or not possible. 2/
The first study to examine super shoes was Hoogkamer et al. (2017) pioneering paper. Here researchers observed an enhancement in running economy (RE) on average by 4% compared to traditional racing shoes.

3/
link.springer.com/article/10.100…
Read 27 tweets
Jan 26, 2022
Interesting point here. A good British standard 65min half runner running 100mpw religiously weighed 73kg.

More than 20kg heavier than world class elite Africans.

This is one of the reasons why East Africans dominate endurance running.

🧵
In a brilliant review of running economy (RE) by Barns & Kilding 2015 discuss numerous factors influencing RE.

RE is multifactorial but an interesting factor discussed is how RE reduces with reduced distal leg mass.

sportsmedicine-open.springeropen.com/articles/10.11…
The lower the mass of the leg further away from the body the lower the energetic cost to move it.

East African's have small amounts of musculature in the lower leg. Their gastrocnemius is small and the bulk of the mass more proximal to the knee with alimb ankles.
Read 8 tweets
Nov 16, 2021
The IOC trans guidelines are very weak.

The performance benefits of testosterone do not discriminate between sport.

On average males have a performance benefit of 11.2% (± 1. 25) across all running events & 19.0% (± 2.57) for all jumping events.

ncbi.nlm.nih.gov/pmc/articles/P…

1/
The gender gap exists across all running distances as shown by Thibault et al (2010) study showsthe smallest margin in running events of 6.5% in the 100m but the largest difference 13.96% I the 4x100m.

ncbi.nlm.nih.gov/pmc/articles/P…

2/
The gender gap in performance is present across all world records, 10.0% ±2.94 between men & women for all events. 

The gap ranges from 5.5% in 800m freestyle, 7% for speed skating, 8.7% cycling, 10.7% in running, & 18.8% in long jump.

Testosterone does not discriminate.

3/
Read 11 tweets
Nov 14, 2021
How was the person able to get away with doping if so many knew? These actions encourage doping and are complicit.

If many people knew why did no one speak out and stop this before it grew.

1/ Image
I have sympathy for many pro athlete's in this situation where doping is systemic to succeed.

You train your whole life to achieve your life long dreams of becoming a pro athlete. Only once you get there you realise the game is rigged.

2/
You are forced with the dilemma after a few years of battling realising that many athlete's are not on a level playing feild.

Neopros UK their training to new heights for little success and end up battling over training. Training harder and harder with little success.

3/
Read 5 tweets
Oct 24, 2021
More suspicious events from British Cycling & UKAD.

Weeks before the London 2012 games a world class cyclist rode away from an anti-doping control officer disappearing out of sight for over an hour.

Thread with more of the same key players involved.
1/

dailymail.co.uk/sport/sportsne…
Both the rider in question who rode away and the group of riders in question regarding the nandrolone tests where both high natural occurring levels and contamination were ruled out were part of Shane Sutton's squad of riders.

2/
As Shane's squad under went testing for nandrolone in an unacredited WADA lab against WADA's rules as few as 10 British Cycling staff were aware, including the gang: Brailsford, Sutton, Peters and Freeman.

3/
Read 7 tweets
Aug 14, 2021
One of anti-doping's biggest challenges is proving how a substance entered an athlete's body. Subsequently, the responsibility has been placed upon the athlete to prove how a substance has came into their body under WADA's Code of 'strict liability'.

Thread 1/
With anti-doping labs analytical sensitivity improving, athletes testing positive due to contamination of supplements for trace amounts of PED's offers a real concern to both athletes and the anti-doping authorities.

2/
Britain's CJ Ujah part of the Olympic 4x100m relay team who won the silver medal at the Tokyo Olympics has returned an AAF for the Selective Androgen Receptor Modulator's (SARM'S) Ostarine & S-23. He is likely to claim a contaminated supplement is the reason behind his AAF

3/
Read 12 tweets

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