lazy math prof wrote:
How about 5k, 10k, marathon, swimming and cycling?
How about it? -- it is your claim. In many ways, this claim fails too for all these events.
In the running events, looking as far back as the 1960s, using a depth of quality (average of 5 fastest) metric over each Olympic cycle for the men:
5K and 10K saw:
- great advancements from East Africans from 1993 onwards, to the present
- similar improvements from North Africans until 2000, followed by an equally rapid decline
- non-Africans with a rapid improvement until the mid-1980s, then only very modest improvements ending around 2012
- since 2009, opportunities for 10K and more recently 5K are declining, due to format changes in track, causing many East Africans to skip track altogether, and go to the roads, leaving these events wide open for Slow Mo to dominate with a fast kick finish.
The marathon saw:
- modest gains from the '70s until 2000
- modest gains from East Africans until around 2007, when Geb started time-trialling
- no further signficant gains after 2000 from non-Africans nor North Africans, although notably Khalid Khannouchi set the world record in 1999 and again in 2002
- rapid gains from East Africans from 2008 onwards
- more rapid gains across the board with the introduction of the Nike Vaporfly
Swimming:
- saw the most gains from swimsuit technology, leading to a massive spike in world records before they were ultimately banned; we saw a similar effect in the marathon with a new running shoe
Cycling:
- nobody seems to talk about world records in cycling
- recently two meta-studies evaluated EPO studies on cycling, concluding that EPO effects were over-estimated, and in real world conditions of the grand tours, would not translate to significant performance increases