So, we have two athletically superior black women in top two places in the 400 m...
Ohuruogu - 175/68 (BMI 22.20 kg/m2)
Montsho - 173/57 (BMI 19.05 kg/m2)
The average physique of Top 30 women in this distance is 171.4 cm/61.6 kg (BMI 20,65 kg/m2). The average physique of medal winners since 2000 is 172,6 cm/62,2 kg (BMI 20,84 kg/m2).
The physiques of these superior black women fit quite favourably in this distance, and in fact, they are even taller than average (undoubtedly, this is due to their inherited superiority, because everybody in USA knows that blacks are so strong and tall). Body height is actually a key performance deteriminant in the 400 m, because it is closely tied with anaerobic capacity that increases with body size.
But let's look... (Yes, "let's look" - the popular words that some Letsrun posters from USA use, when pointing at the impressive stats from their sports that nobody outside USA is interested in)... let's look at the body dimensions of their native populations. Thanks to the UK british survey from 2004, we know the average body height of African women:
Black African women in UK (2004, 16-34 years): 163.3 cm (n=160)
We also know the average height of US black women, by the way:
NHANES 2003-06: 163.2 cm
NHANES 2007-10: 163.7 cm
And we also have a certain idea about the height of women in Jamaica:
163.4 cm (2007-08)
164.6 cm (1999)
And thanks to demographic and health surveys (DHS), we also know the average height of women in Nigeria, the home of Ohuruogu's parents:
Nigeria (20-24 years),
DHS survey 2008:
156.6 cm (n=3304)
Nigeria (20-24 years)
DHS survey 2003:
158.4 cm (n=1461)
(Well, we know that the body height of Subsaharan Africans has been decreasing since decolonization, but it doesn't matter; they remain athletically superior anyway.)
We don't know the average height of women in Botswana. Due to higher GDP, it will probably be a bit higher than in South Africa (159.0 cm), Namibia (160.1 cm) and Zimbabwe (159.5 cm), but I would bet that the difference won't be fundamental.
And now, let's look at physiques of those unathletic, degenerated white women:
Dalmatia, Herzegovina 171.1 cm (2001-03)
Netherlands 170.7 cm (2009)
Montenegro 168.4 cm (2011)
Sweden (Göteborg area) 167.9 cm (2008-09)
Lithuania 167.9 cm (2008)
Estonia 167.9 cm (2003-05)
Czech republic 167.3 cm (2001)
Serbia 167.3 cm (2006)
Norway (Bergen) 167.2 cm (2003-06)
Latvia 166.8 cm (2005-06)
Croatia 166.3 cm (2006-08)
Germany 165.8 cm (2003-06)...
Wait... What the hell does it mean?! How is it possible that athletically superior black women as much as 10 cm smaller than athletically inferior white women? I am utterly lost... I need a sports expert from ESPN! Heeeeeeeeeelp!!!!