https://www.bbc.co.uk/sport/athletic...s/cg39x2jg5pgo
In a similar vein I was struck by the conclusion to this article on what I find to be an interesting subject, which (despite having no evidence to support) decided to settle on it being a self-fulfilling prophecy based on harmful assumptions as to why black sprinters are so much better than white ones.
That's settled that then.But the belief remains strong and perception is powerful - it can make or break champions.