Naoki (久保直樹) Kubo
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Born : 1968
Cat. M55 Ultrarunner since 2016
5
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
20
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
Japan44,7%
Rank quotient ?This runner's calculation uses 5 eligible race(s): Σ(rank − 1) = 2 115; Σ finishers = 4 731. 2 115 / 4 731 × 100 = 44.71%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed5
Km — ultra races461 km
Longest race100,0 km
7th Tokyo Shibamata 100 km — 19/5/2019
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road100,0%
Records
HISTORY
5 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2021 | ||||
| 27.02 | 91km | 11th Little Edo 91k |
11:58:49 h | 16 |
| 2019 | ||||
| 19.05 | 100km | 7th Tokyo Shibamata 100 km |
12:35:48 h | 764 |
| 2018 | ||||
| 14.04 | 70km | 13th Toda Saiko 70 km |
6:51:51 h | 115 |
| 2017 | ||||
| 04.06 | 100km | 5th Tokyo Shibamata 100 km |
11:47:31 h | 583 |
| 2016 | ||||
| 05.06 | 100km | 4th Tokyo Shibamata 100 km |
12:28:48 h | 642 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 19/5/2019 | 7th Tokyo Shibamata 100 km | 100,00 | ×5 |
| ✓ 2 | 4/6/2017 | 5th Tokyo Shibamata 100 km | 100,00 | ×5 |
| ✓ 3 | 5/6/2016 | 4th Tokyo Shibamata 100 km | 100,00 | ×5 |
| ✓ 4 | 27/2/2021 | 11th Little Edo 91k | 91,00 | ×4 |
| ✓ 5 | 14/4/2018 | 13th Toda Saiko 70 km | 70,00 | ×3 |