Naoyuki (岡尚志) Oka
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Ultrarunner since 2002
8
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
24
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
Japan16,0%
Rank quotient ?This runner's calculation uses 8 eligible race(s): Σ(rank − 1) = 1 064; Σ finishers = 6 648. 1 064 / 6 648 × 100 = 16.00%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed8
Km — ultra races686 km
Longest race100,0 km
8th Sunny Okayama 100km — 3/5/2026
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road58,3%
Trail41,7%
Records
HISTORY
8 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 03.05 | 100km | 8th Sunny Okayama 100km |
20:35:24 h | 168 |
| 2025 | ||||
| 03.05 | 100km | 7th Sunny Okayama 100km |
22:25:26 h | 354 |
| 2024 | ||||
| 03.05 | 100km | 6th Sunny Okayama 100km |
19:39:26 h | 117 |
| 2023 | ||||
| 03.05 | 100km | 5th Sunny Okayama 100km |
22:09:11 h | 284 |
| 2005 | ||||
| 09.10 | 71.5km | 13th Hasetsune Cup - Japan Mountain Endurance Race |
10:20:39 h | 32 |
| 2004 | ||||
| 10.10 | 71.5km | 12th Hasetsune Cup - Japan Mountain Endurance Race |
10:44:48 h | 18 |
| 2003 | ||||
| 25.10 | 71.5km | 11th Hasetsune Cup - Japan Mountain Endurance Race |
10:21:31 h | 28 |
| 2002 | ||||
| 12.10 | 71.5km | 10th Hasetsune Cup - Japan Mountain Endurance Race |
12:57:08 h | 71 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 3/5/2026 | 8th Sunny Okayama 100km | 100,00 | ×4 |
| ✓ 2 | 3/5/2025 | 7th Sunny Okayama 100km | 100,00 | ×4 |
| ✓ 3 | 3/5/2024 | 6th Sunny Okayama 100km | 100,00 | ×4 |
| ✓ 4 | 3/5/2023 | 5th Sunny Okayama 100km | 100,00 | ×4 |
| ✓ 5 | 9/10/2005 | 13th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 6 | 10/10/2004 | 12th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 7 | 25/10/2003 | 11th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 8 | 12/10/2002 | 10th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |