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hippy
I also thought those numbers looked a bit toppy so a quick google gives a comparison:
*Froome’s peak power during the test was 525 watts, with a sustained power of 419 (a power he should hold for 20-40 minutes). It correlates to 5.98 watts-per-kilogram at his test weight, and 6.25w/kg at his Tour weight of 67kg.
He is reported to have been carrying around 3kg more weight when the test was taken than in the Tour (67 to 69.9kg) and had a body fat percentage of 9.8.
“I’ve seen a value of 5.8w/kg being spoken of as the upper limit of human performance for a 40-minute effort,” Swart told Esquire.*
http://www.cyclingweekly.com/news/latest-news/chris-froome-described-as-close-to-human-peak-after-physiological-data-release-202644#kfiKoVOj0rAcK3KU.99