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stevemagness's profile
Steve Magness
Steve Magness
Steve Magness
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@stevemagness

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Steve MagnessVerified account

@stevemagness

Author of: Peak Performance, The Passion Paradox, The Science of Running. Co-Founder: The Growth Equation Performance Coach: http://www.stevemagness.com 

Houston, TX
TheGrowthEq.com
Joined December 2009

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    Steve Magness‏Verified account @stevemagness 3 May 2019

    A few comments on this article in the @nytimes. Which I think is misleading and takes away from the discussion on DSD and the Semenya case:https://www.nytimes.com/2019/05/03/opinion/testosterone-caster-semenya.html …

    8:43 AM - 3 May 2019
    • 126 Retweets
    • 379 Likes
    • Will brixnstix David Navarro John T Weatherly Dina Elena Anikina Philippe Lemoine HEDN Aodhagán
    32 replies 126 retweets 379 likes
      1. New conversation
      2. Steve Magness‏Verified account @stevemagness 3 May 2019

        1. No one is arguing that Testosterone is be all end all to performance. ZERO people. We are arguing that it does impact performance and explain SOME of the difference between men and women. But more so: That Testosterone is a surrogate divider of sex.

        1 reply 7 retweets 79 likes
        Show this thread
      3. Steve Magness‏Verified account @stevemagness 3 May 2019

        RE: Divider of Sex. Why is it used as a marker? Because the overlap between male and females is minimal. Just about Zero XX women have natural testosterone levels that reach the even the low male levels. So it's used as a surrogate marker for sex to divide.

        4 replies 10 retweets 86 likes
        Show this thread
      4. Steve Magness‏Verified account @stevemagness 3 May 2019

        Think of it like this: We would use height to divide females and males IF 99.9% of males were taller than 6ft and 99% of women were shorter than 5'6.

        1 reply 3 retweets 58 likes
        Show this thread
      5. Steve Magness‏Verified account @stevemagness 3 May 2019

        Testosterone and Performance: What the article does is confuse Testosterone being correlated with performance and its impact on performance. Whether or not it is correlated with performance depends on the group being sampled.

        2 replies 5 retweets 47 likes
        Show this thread
      6. Steve Magness‏Verified account @stevemagness 3 May 2019

        Take a group of world class women 100m runners, and testosterone is NOT going to be the sole differentiating factor between the fastest and slowest runners. Why? Performance is complex! No one factors explains much of performance, it doesn't mean that it doesn't matter.

        3 replies 6 retweets 50 likes
        Show this thread
      7. Steve Magness‏Verified account @stevemagness 3 May 2019

        In another thread I discussed why correlated T to performance in world class athletes is fraught with difficulty but to summarize: -A large % of the sample is doped which artificially raises and lowers T levels in blood samples -Fatigue, when samples are taken, etc.

        1 reply 3 retweets 45 likes
        Show this thread
      8. Steve Magness‏Verified account @stevemagness 3 May 2019

        We can see some of these holes in the article mentioned. It quotes a study comparing weight throwers and distance runners... Distance athletes if doing high volume will suppress some Testosterone because of training load. That doesn't mean Testosterone doesn't help performance

        1 reply 4 retweets 48 likes
        Show this thread
      9. Steve Magness‏Verified account @stevemagness 3 May 2019

        How much of a difference does Testosterone make and what's its role? -We know from studies of athletes on steroids int he 1980's that artificial Testosterone boosted 800m performance in women by 5-7 seconds. That's incredible at the highest level.

        3 replies 10 retweets 69 likes
        Show this thread
      10. Steve Magness‏Verified account @stevemagness 3 May 2019

        -We know that when Semenya was made to reduce Testosterone levels during roughly the 2012-2015 period (because of the new rules). Her performance declined from 1:55 towards a norm of 2:00-2:02 range. That data alone shows the impact T has on a singular athletes performance.

        5 replies 11 retweets 75 likes
        Show this thread
      11. Steve Magness‏Verified account @stevemagness 3 May 2019

        So testosterone absolutely matters. Especially on an individual level. But it's important to remember that the reason Testosterone is used is because it's a surrogate marker. NOT because it's the only thing that matters for performance between men and women.

        1 reply 9 retweets 58 likes
        Show this thread
      12. Steve Magness‏Verified account @stevemagness 3 May 2019

        Finally, the best evidence is when we look at the rate of progression of boys and girls in a variety of athletic endeavors as they go from per-pubescent to post-puberty. There performances look like the following:pic.twitter.com/IM3MKcRYSl

        1 reply 8 retweets 62 likes
        Show this thread
      13. Steve Magness‏Verified account @stevemagness 3 May 2019

        Or another few charts from studies that show the impact of puberty (and soaring testosterone) on male athletic performance.pic.twitter.com/e3YzKui9Ee

        1 reply 4 retweets 51 likes
        Show this thread
      14. Steve Magness‏Verified account @stevemagness 3 May 2019

        Articles like this remind me of the 1960's argument over steroids. You had researchers saying "steroids don't help performance" While all of the athletes were screaming "This stuff absolutely works! We need to regulate!"

        1 reply 6 retweets 56 likes
        Show this thread
      15. Steve Magness‏Verified account @stevemagness 3 May 2019

        So what? Articles like this distract and take us away from the main issue of DSD and Semenya. Testosterone is a surrogate marker. It absolutely plays a large role in performance. BUT is it the best marker to separate sport by sexes? No idea.

        1 reply 6 retweets 46 likes
        Show this thread
      16. Steve Magness‏Verified account @stevemagness 3 May 2019

        Stating that Testosterone is a myth changes the dialogue. It makes it seem like the IAAF is out to get women. The reality is because of testosterone (and other factors) the IAAF is faced with trying to protect the majority of women.

        2 replies 9 retweets 76 likes
        Show this thread
      17. Steve Magness‏Verified account @stevemagness 3 May 2019

        IF we didn't divide by sex and had one big category... zero women could compete at the professional level. The fastest female 400m runner in the world last year was "beaten" by over 5,000 men...

        6 replies 35 retweets 190 likes
        Show this thread
      18. Steve Magness‏Verified account @stevemagness 3 May 2019

        What we have to wrestle with is.... what are the ethics of protecting the majority so that they can compete, while not harming the minority. It's an impossible task. But we need smart minds on that question, NOT whether or not testosterone helps performance...

        10 replies 17 retweets 170 likes
        Show this thread
      19. End of conversation

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