http://www.nature.com/nature/journal/v487/n7407/full/487295a.html
Olympics: Run for your life
Published online 18 July 2012
Humans evolved to run. This helps to explain our athletic capacity and our susceptibility to modern diseases, argue Timothy Noakes and Michael Spedding. ...
We, the authors, were both considering the modern paradox of elite
athleticism and growing susceptibility to disease when we met at a sports conference in Glasgow, UK, in 2010. Noakes is a sports scientist who has
run more than 70 marathons and ultramarathons. He was presenting data suggesting that humans' unmatched ability to dissipate heat when running,
even when drinking sparingly, might have been a key element that enabled
them to evolve from tree-living primates. Spedding, a pharmacologist
presenting studies of how stress can increase the risk of psychiatric disorders, has run more than 100,000 kilometres and been a competitive
athlete for more than 40 years. His brother, Charlie, holds the English marathon record and won Olympic bronze in 1984 by ignoring drink stations
at crucial stages in the Los Angeles marathon. We began exchanging e-mails. Eventually, that correspondence coalesced into the theory we outline here.
...
Over the past few million years, the climate underwent dramatic shifts and Africa changed from a largely forested ecosystem to a more open savannah.
Our ancestors, caught at the edge of the retreating forests, became less adapted for climbing trees. By 2 million years ago, they had evolved a
skeleton that could support walking and running - partly so that they
could hunt by pursuing individual animals for hours at a time.
...
The best weapon was endurance. The predators had to outlast their prey,
and so had many adaptations that enabled them to walk and run long distances, forcing their prey to gallop. Because four-legged animals cannot lose heat
by panting and galloping at the same time, human hunters eventually drive
their prey into heat stroke, so that the animal can be caught and killed
with very simple weapons.
...
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