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  • More on the Semanya issue...

    The birth defect people don’t talk about

    By Seth Borenstein, AP Science Writer 8 hours, 49 minutes ago



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    WASHINGTON – It’s the birth defect people don’t talk about. A baby is born not completely male or female. The old term was hermaphrodite, then intersex. Now it’s called “disorders of sexual development.” Sometimes the person with the problem doesn’t even know it and finds out in an all too public way.
    That’s been the painful plight of a few female athletes through history. And apparently that’s the situation for South African track star Caster Semenya.
    Two Australian newspapers reported Friday that gender tests show the world champion athlete has no ovaries or uterus and internal testes that produce large amounts of testosterone. The international sports federation that ordered the tests wouldn’t confirm the reports.
    Other stories resonating on the Yahoo! network:




    Experts say Semenya should be allowed to race as a woman and they cringe at how her case is exploding publicly in the news media. They worry about psychological scars. Two years ago, a star female track athlete who tested male attempted suicide.
    Unless she took some illicit substance, Semenya is a female with a birth defect, simple as that, said Dr. Myron Genel, a professor emeritus of pediatrics at Yale University. He was part of a special panel of experts convened by the International Association of Athletics Federations in 1990 that helped end much, but not all, genetic gender testing.
    “It’s no different in a sense than a youngster who is born with a hole in the heart,” Genel said. “These are in fact birth defects in an area that a lot of people are uncomfortable with.”
    Semenya is hardly alone. Estimates vary, but about 1 percent of people are born with abnormal sex organs, experts say. These people may have the physical characteristics of both genders or a chromosomal disorder or simply ambiguous features.
    Sometimes a sexual development problem is all too obvious when a baby is born. Other times, the disorder in girls may not be noticed until puberty, when she doesn’t start her period. And still other times, especially with the androgen insensitivity syndrome experts think Semenya might have, it remains hidden until she tries to have a baby — or in the case of an athlete, until she’s given a genetic test.
    Genetic testing of women over five Olympics found genetic gender issues in 27 out of 11,373 women tested, according to a 2000 Journal of the American Medical Association article. However, none were men deliberately posing as women, as competitors fear.
    Dr. Louis Elsas, chairman of biochemistry at the University of Miami and a member of the IAAF panel with Genel, said he had hoped the genetic gender testing issue was over after the 1996 Olympics, when most major sports abandoned regular testing. He recalled having to talk to a female athlete and reveal that she had XY chromosomes and that she’d be infertile. It’s something that shouldn’t splash onto television, newspapers and the Internet, he said.
    “It’s a severe emotional trauma,” Elsas said.
    The concern that women with XY chromosomes have a competitive advantage “is malarkey. We don’t segregate athletes by height,” said Genel, speaking from an international endocrinology conference in New York that has sessions on intersex issues.
    Dr. Joe Leigh Simpson, past president of the American College of Medical Genetics and a member of the IAAF panel, agreed: “Any elite athlete … has a competitive advantage, or otherwise they wouldn’t be an elite athlete.”
    Simpson, associate dean at Florida International University, said the issue should be simply whether men are masquerading as women. Semenya is clearly a woman, he said.
    Nearly all the disorders are caused by genetic mutations, Simpson said. And they usually happen in the first eight weeks of pregnancy, he said.
    There are many types of sexual development disorders, all of them rare, but they add up, the experts said. Depending on the particular disorder and individual condition, treatment could involve surgery or hormone therapy or both. The issue is often not just what sex to assign the child, but when to assign it. It used to be that doctors pushed surgery on babies; now many times they wait. Sometimes they wait until the patient is old enough to help make a decision.
    David Sandberg, a pediatric psychologist at Michigan, said he advises families to go slowly when deciding whether to raise their child as a boy or girl or whether to have surgery. Treatment varies depending on the disorder, but has become more conservative over the years, he said.
    But that’s when the problem is noticeable. When it comes to some athletes like Semenya, it’s not even known until tests reveal it.
    Maria Martinez-Patino knows the issue firsthand. A world-class athlete, she was raised and looked like a normal female and even received the needed “certificate of feminity” to participate in the 1983 World Track and Field Championships in Helsinki, Finland.
    In 1985 at the World University Games in Kobe, Japan, her test came back with an XY and she was not allowed to compete. Martinez-Patino had androgen insensitivity, meaning she didn’t respond to testosterone. That meant she also didn’t have a competitive advantage from having an XY chromosome.
    “I sat in the stands that day watching my teammates, wondering how my body differed from theirs,” she wrote in the medical journal The Lancet in 2005. “I spent the rest of that week in my room, feeling a sadness that I could not share.”
    Updated 8 hours, 49 minutes ago

  • #2
    Originally posted by Exile View Post

    “Any elite athlete … has a competitive advantage, or otherwise they wouldn’t be an elite athlete.”
    Asafa?

    Bolt?
    "Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has."

    Comment


    • #3
      The long-distance races are dominated by the Kenyans and Ethiopians primarily. It would seem that Africans from that part of the continent have some competitive (genetic?) advantage.... Dr. Exile, what say you?
      Peter R

      Comment


      • #4
        International SportMed Journal
        Review article
        Genetics and the success of East African distance runners
        Dr Robert A Scott, BSc, PhD, *Dr yannis P Pitsiladis, MMedSci, PhD
        International Centre for East African Running Science (ICEARS), Faculty of Biomedical and Life Sciences (IBLS), University of Glasgow, Glasgow, United Kingdom
        Abstract
        A look at the medal podium in almost any international sporting competition reveals that some athletes and certain countries enjoy regular success in particular events. One of the most compelling examples is that of East African runners and their domination of international distance running competition. This phenomenon has led to the suggestion that East Africans possess some inherent genetic advantage predisposing them to superior athletic performances. The concurrent success of athletes of West African ancestry in sprint events appears to have augmented this belief given their similar skin colour. Despite the speculation that African athletes have a genetic advantage, there is no genetic evidence to dateto suggest that this is the case, although research is at an early stage. The only available genetic studies of African athletes do not find that these athletes possess a unique genetic makeup; rather they serve to highlight the high degree of genetic diversity in East Africa and also among elite East African athletes. Although genetic contributions to the phenomenal success of East Africans in distance running cannot be excluded, results to date predominantly implicate environmental factors. Keywords: genetic predisposition, East Africa, athlete, endurance, running, environment
        Dr Robert A Scott, BSc PhD
        Dr Robert Scott is a research assistant at the University of Glasgow, Glasgow, UK. His major research interests include genetic predispositions to health and fitness-related phenotypes.
        Contact details:
        Conclusions
        The limited studies presented above constitute the only available work to date on the genetics of the African running phenomenon and show that the athletes, although arising from distinct regions of East Africa, do not arise from a limited genetic isolate. For example, the Y chromosome types found in excess in elite Ethiopian athletes are also found outside Africa. Other findings suggest that the most studied of the previously identified performance genes (i.e. ACE), does not appear to influence the success of East African athletes, which highlights another important point surrounding the genetics of exercise performance: in no study to date has a cohort of elite athletes all shown the same genotype. It may be the case that a particular genetic variant is more frequent in the elite athletes relative to a non-athlete population, which may satisfy the statistical requirement of P < 0.05, but the biological importance of such a statistical boundary remains to be elucidated. It also serves to highlight the fact that there are many paths to success and that one can overcome a potentially disadvantageous genotype. It is likely that any single gene variant that offers advantage influences the fine-tuning of performance rather than simply conferring success or failure. Any of these potentially advantageous gene variants are likely to be found in excess amongst elite athletes but the exact combinations needed for international success remain unknown. It is perhaps unlikely that East Africa is producing unique genotypes that cannot be matched by those from other areas of the world, but more likely that those in East Africa with an advantageous genotype realise their advantage through having used it regularly. It is interesting that Ethiopia and Kenya do not share a similar genetic ancestry, as defined by mtDNA 22;43, but what they do share is a similar environment: moderate altitude and high levels of physical activity. Few other regions of the world have such high levels of childhood physical activity combined with such cultural/financial importance being placed on distance running. This information clearly implicates environmental factors as being more influential than genetic factors in the success of East African distance runners. In an economically deprived region such as East Africa, economic factors also provide an additional motivation, if not a necessity, to succeed in distance running. In summary, it is unjustified at present to regard the phenomenon of East African running success as genetically mediated; to justify doing so one must identify the genes that are important. To do so also disregards the intense training regimens for which East African athletes are famous 56.
        Full Article:
        http://www.fims.org/default.asp?pageID=782860264

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        • #5
          J Appl Physiol 75: 1822-1827, 1993;
          8750-7587/93 $5.00
          This ArticleFull Text (PDF) Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map ServicesEmail this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing ArticlesCiting Articles via HighWire Citing Articles via Google Scholar Google ScholarArticles by Coetzer, P.Articles by Dennis, S. C.Search for Related Content PubMedPubMed Citation Articles by Coetzer, P. Articles by Dennis, S. C.

          Journal of Applied Physiology, Vol 75, Issue 4 1822-1827, Copyright © 1993 by American Physiological Society
          ARTICLES

          Superior fatigue resistance of elite black South African distance runners


          P. Coetzer, T. D. Noakes, B. Sanders, M. I. Lambert, A. N. Bosch, T. Wiggins and S. C. Dennis
          Liberty Life Chair of Exercise and Sports Science, University of Cape Town Medical School, Observatory, South Africa.
          Black athletes currently dominate long-distance running events in South Africa. In an attempt to explain an apparently superior running ability of black South African athletes at distances > 3 km, we compared physiological measurements in the fastest 9 white and 11 black South African middle-to long-distance runners. Whereas both groups ran at a similar percentage of maximal O2 uptake (%VO2max) over 1.65-5 km, the %VO2max sustained by black athletes was greater than that of white athletes at distances > 5 km (P < 0.001). Although both groups had similar training volumes, black athletes reported that they completed more exercise at > 80% VO2max (36 +/- 18 vs. 14 +/- 7%: P < 0.005). When corrections were made for the black athletes' smaller body mass, their superior ability to sustain a high %VO2max could not be explained by any differences in VO2max, maximal ventilation, or submaximal running economy. Superior distance running performance of the black athletes was not due to a greater (+/- 50%) percentage of type I fibers but was associated with lower blood lactate concentrations during exercise. Time to fatigue during repetitive isometric muscle contractions was also longer in black runners (169 +/- 65 vs. 97 +/- 69 s; P < 0.05), but whether this observation explains the superior endurance or was due to the lower peak muscle strength (46.3 +/- 10.3 vs. 67.5 +/- 18.0 Nm/l lean thigh volume; P < 0.01) remains to be established.



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          • #6
            Physiological differences between black and white runners during a treadmill marathon

            JournalEuropean Journal of Applied Physiology and Occupational PhysiologyPublisherSpringer Berlin / HeidelbergISSN0301-5548 (Print) 1439-6327 (Online)IssueVolume 61, Numbers 1-2 / September, 1990DOI10.1007/BF00236696Pages68-72SpringerLink DateFriday, December 10, 2004Add to marked items
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            Physiological differences between black and white runners during a treadmill marathon
            Andrew N. Bosch1 , Brian R. Goslin2, Timothy D. Noakes1 and Steven C. Dennis1
            (1) Liberty Life Chair of Exercise and Sports Science and MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School, Observatory, 7925 Cape Town, South Africa(2) Department of Human Movement Studies and Physical Education, Rhodes University, Grahamstown, South AfricaAccepted: 11 December 1989
            Summary To determine why black distance runners currently out-perform white distance runners in South Africa, we measured maximum oxygen consumption (V O 2max), maximum workload during a V O 2max test (L max), ventilation threshold (V Thr), running economy, inspiratory ventilation (V I), tidal volume (V T), breathing frequency (f) and respiratory exchange ratio (RER) in sub-elite black and white runners matched for best standard 42.2 km marathon times. During maximal treadmill testing, the black runners achieved a significantly lower (P<0.05) L max (17 km h–1, 2% grade, vs 17 km h–1, 4% grade) and V I max (6.21 vs 6.821 kg–2/3 min–1), which was the result of a lower V T (101 vs 119 ml kg–2/3 breath–1) as f max was the same in both groups. The lower V T in the black runners was probably due to their smaller body size. The V Thr occurred at a higher percentage V O 2max in black than in white runners (82.7%, SD 7.7% vs 75.6%, SD 6.2% respectively) but there were no differences in the V O 2max. However, during a 42.2-km marathon run on a treadmill, the black athletes ran at the higher percentage V O 2max (76%, SD 7.9% vs 68%, SD 5.3%), RER (0.96, SD 0.07 vs 0.91, SD 0.04) and f (56 breaths min–1, SD 11 vs 47 breaths min–1, SD 10), and at lower V T (78 ml kg–2/3 breath–1, SD 15 vs 85 ml kg–2/3 breath–1, SD 19). The combination of higher f and lower V T resulted in an identical V I. Blood lactate levels were lower in black than in white runners (1.3 mmol l–1, SD 0.6 vs 1.59 mmol l–1, SD 0.2 respectively). It appeared that the only physiological difference that may account for the superior performance of the black runners was their ability to run at a higher percentage V O 2max max during competition than white runners.
            Key words Marathon running - Maximum oxygen consumption - Race - Running economy

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            • #7
              This one is interesting....we could use this psycholgical advantage for Jamaican sprinters!!!!
              British Journal of Sports Medicine 2000;34:391-394; doi:10.1136/bjsm.34.5.391 Copyright © 2000 BMJ Publishing Group Ltd & British Association of Sport and Exercise Medicine.

              Br J Sports Med 2000; 34:391-394
              © 2000 the British Journal of Sports Medicine
              Education and debate

              East African running dominance: what is behind it?

              </STRONG>Bruce Hamilton
              Sports Medicine, Australian Institute of Sport, Leverrier Crescent, Bruce, ACT 2617, Australia
              Correspondence to:
              Correspondence to: B Hamilton email: registrar@hughessportsmed.com.au
              Accepted 20 April 2000
              Introduction
              East African middle and long distance runners are currently the dominant force in athletics. As well as dominating the track events at the last several Olympic Games, they are also dominant on the American and European road racing circuit and world cross country events. Although many physiological and anatomical factors have been proposed to explain East African dominance, research into these variables has not yet revealed any definitive advantage for the African. Traditional social and cultural factors have often been described as "advantageous", and, although these factors may be to a greater or lesser extent involved in the East African dominance, it is probable that both the African and caucasian psychology or "mindset" are now additional important factors in maintaining that dominance. Like Scandinavian distance runners in the early 20th century, who won 28 of 36 possible Olympic medals over 5000 and 10 000 m, the East Africans have developed . . . [Full text of this article]

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              • #8
                That is true.

                Should she be allowed to compete with the women though? I am not sure I agree.

                Its a tough one though because she would also be at a disadvantage competing with the men.
                "‎It is easier to build strong children than to repair broken men" - Frederick Douglass

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                • #9
                  Didn't the early Kenyan dominance come from thier advantage from training at altitude? I remember reading somewhere that most of the Kenyan athletes came from communities that lived in the Kilamanjaro mountains.

                  Its probably also become a cultural thing for them now, like sprinting is for us,
                  "‎It is easier to build strong children than to repair broken men" - Frederick Douglass

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                  • #10
                    They said that...and also running from lions and tigers...the first article talks about running to school for 20 km daily....

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