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Comparing Kazami and Walmsley's Runs

American Jim Walmsley  gave the men's world record set two and a half years ago by Japan's Nao Kazami  a serious scare this weekend at the Project Carbon X 2 100 km. A quick look at their splits shows two different race strategies, Kazami essentially going out hard and slowing the second half and Walmsley running the first half more conservatively and then trying to negative split. Both had relatively slow starts before zeroing in on their first half target pace, Kazami settling in around 36:20 per 10 km and Walmsley around 36:50 until they hit halfway. At that point Kazami was projecting a 6:04:10 world record, with Walmsley's 50 km split projecting to a record of 6:08:30. From there they swapped, Kazami going 36:52 from 50 km to 60 km and Walmsley 36:22. That proved Walmsley's fastest split of the day, as although he stayed close to that pace through 80 km  he began to slow for every remaining 10 km split until the finish. In Kazami's case he hit a rough patch bet
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