Takayuki (石田貴幸) Ishida
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17
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
37
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?
Japan
44,0%
Rank quotient ?This runner's calculation uses 18 eligible race(s): Σ(rank − 1) = 3 113; Σ finishers = 7 067. 3 113 / 7 067 × 100 = 44.05%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed18
Km — ultra races1 777 km
> 100 km3
Longest race145,0 km
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road87,8%
Trail12,2%
Records
HISTORY
18 race(s)| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 2/11/2019 | 1st Autumn leaves in Okumusashi / Chichibu Journey run | 145,00 | ×3 |
| ✓ 2 | 17/7/2021 | 1st Nakasendo Ultra | 117,00 | ×3 |
| ✓ 3 | 2/9/2017 | 1st Miyagi Yumeguri Ultra Marathon - 115 km | 115,00 | ×3 |
| ✓ 4 | 29/9/2024 | 2nd Mount Akagi 100 Ultra Marathon | 100,00 | ×2 |
| ✓ 5 | 25/4/2021 | 6th Tokyo Ultra Marathon - 100 km | 100,00 | ×2 |
| ✓ 6 | 20/10/2019 | 25th River Shimanto 100km | 100,00 | ×2 |
| ✓ 7 | 28/4/2019 | 4th Tamagawa Ultra Marathon - 100 km | 100,00 | ×2 |
| ✓ 8 | 16/12/2018 | 3rd Okinawa 100km Ultramarathon | 100,00 | ×2 |
| ✓ 9 | 17/12/2017 | 2nd Okinawa 100km Ultramarathon | 100,00 | ×2 |
| ✓ 10 | 8/1/2017 | 2nd Yakushima Ultramarathon | 100,00 | ×2 |
| ✓ 11 | 18/12/2016 | 1st Okinawa 100km Ultramarathon | 100,00 | ×2 |
| ✓ 12 | 12/6/2016 | 12th Iwate Ginga 100km Marathon Challenge | 100,00 | ×2 |
| ✓ 13 | 29/5/2011 | 18th Ebisu-Daikoku 100 km Marathon | 100,00 | ×2 |
| ✓ 14 | 17/10/2010 | 16th River Shimanto 100km | 100,00 | ×2 |
| ✓ 15 | 27/6/2010 | 10th Nichinan Orochi 100 km Marathon | 100,00 | ×2 |
| ✓ 16 | 23/5/2010 | 2nd 100 km Ultra Maranic Osaka | 100,00 | ×2 |
| ✓ 17 | 19/10/2008 | 14th River Shimanto 100km | 100,00 | ×2 |