PAUL KITAGAKI JR./pkitagaki@sacbee.com

Jeff Boutte uses his arrival Saturday at the 6,300-foot-high Robinson Flat aid station to restore some of the calories that he no doubt lost during the first 29.7 miles of the Western States Endurance Run. The Squaw-Valley-to-Auburn ultramarathon, which requires participants to travel 100 miles on steep trails, attracts scientists studying the limits of human endurance.

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