Tsutomu (中野努) Nakano
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13
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
25
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
52,0%
Rank quotient ?This runner's calculation uses 13 eligible race(s): Σ(rank − 1) = 3 778; Σ finishers = 7 261. 3 778 / 7 261 × 100 = 52.03%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed13
Km — ultra races830 km
Longest race100,0 km
36th Fuji 4 Lakes 100 km Challenge — 19/4/2026
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road41,8%
Trail58,2%
Records
HISTORY
13 race(s)| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 19/4/2026 | 36th Fuji 4 Lakes 100 km Challenge | 100,00 | ×4 |
| ✓ 2 | 21/4/2024 | 34th Fuji 4 Lakes 100 km Challenge | 100,00 | ×4 |
| ✓ 3 | 16/3/2024 | 8th Minamiboso 75km | 75,00 | ×3 |
| ✓ 4 | 30/5/2026 | 10th Yokosuka Miura 72km Michikusa Ultra Marathon | 72,00 | ×2 |
| ✓ 5 | 14/12/2025 | 12th Izu Trail Journey | 70,00 | ×2 |
| ✓ 6 | 5/7/2025 | 3rd Shiga Kogen 55 | 55,00 | ×2 |
| ✓ 7 | 7/9/2025 | 18th OSJ Adatara Trail 50K | 53,40 | ×2 |
| ✓ 8 | 6/10/2024 | 12th Trainic world Ogose-Tokigawa Trail Run 50km | 51,40 | ×2 |
| ✓ 9 | 10/5/2026 | 7th FunTrails Round Minano | 51,00 | ×2 |
| ✓ 10 | 11/5/2025 | 6th FunTrails Round Minano | 51,00 | ×2 |
| ✓ 11 | 12/5/2024 | 5th FunTrails Round Minano | 51,00 | ×2 |
| ✓ 12 | 15/11/2025 | 11th FunTrails50K Round | 50,00 | ×2 |
| ✓ 13 | 1/12/2024 | 11th Trainic world Soto-Chichibu Trail Run 50km | 50,00 | ×2 |