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Thanks for the shoutout!
In addition the physiology, psychology definitely comes into play in the ultra distances. Additionally in a sport with Kenyan and Ethiopian runners at the top in most of the marathon events, we have not seen a lot of these elites at ultra races. Perhaps something that will change over time.
Commented Dec 31, 2015 on Using segmented regression to analyse world record running times at Revolutions
Using segmented regression to analyse world record running times
by Andrie de Vries A week ago my high school friend, @XLRunner, sent me a link to the article "How Zach Bitter Ran 100 Miles in Less Than 12 Hours". Zach's effort was rewarded with the American record for the 100 mile event. Zach Bitter holds the American record for the 100 mile This reminded...
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