Hiroshi (岡宏) Oka
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Born : 1971
Cat. M55 Ultrarunner since 2017
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
Japan67,8%
Rank quotient ?This runner's calculation uses 17 eligible race(s): Σ(rank − 1) = 10 382; Σ finishers = 15 304. 10 382 / 15 304 × 100 = 67.84%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed19
Km — ultra races1 755 km
> 100 km4
> 160 km1
> 200 km1
Longest race225,0 km
14th Gunma 100km Walk — 10/5/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road47,0%
Trail29,9%
Stage16,0%
Ult.Walk7,1%
Records
HISTORY
17 race(s) · 4 stage(s) nested| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 10/5/2025 | 14th Gunma 100km Walk | 225,00 | ×6 |
| ✓ 2 | 28/2/2026 | 3rd Modern Japanese Silk Road Journey Run | 150,00 | ×4 |
| ✓ 3 | 1/11/2025 | 3rd Mito Kaido Journey run | 130,00 | ×3 |
| ✓ 4 | 7/6/2025 | 9th Fujisan Issyu Walking | 125,00 | ×3 |
| ✓ 5 | 29/9/2024 | 2nd Mount Akagi 100 Ultra Marathon | 100,00 | ×2 |
| ✓ 6 | 10/3/2024 | 6th Ibaraki 100k Ultra Marathon | 100,00 | ×2 |
| ✓ 7 | 11/6/2023 | 17th Iwate Ginga 100km Marathon Challenge | 100,00 | ×2 |
| ✓ 8 | 9/6/2019 | 8th Hida Takayama 100 km Ultramarathon | 100,00 | ×2 |
| ✓ 9 | 24/6/2018 | 33. Lake Saroma 100 km Ultramarathon | 100,00 | ×2 |
| ✓ 10 | 4/6/2017 | 5th Tokyo Shibamata 100 km | 100,00 | ×2 |
| ✓ 11 | 28/4/2018 | 5th Shizuoka to Yamanashi (STY) | 92,00 | ×2 |
| ✓ 12 | 23/9/2023 | 9th SkyViewTrail Memorial Cup | 80,00 | ×2 |
| ✓ 13 | 8/10/2023 | 31th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×1 |
| ✓ 14 | 9/10/2022 | 30th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×1 |
| ✓ 15 | 8/10/2017 | 25th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×1 |
| ✓ 16 | 11/12/2022 | 9th Izu Trail Journey | 70,00 | ×1 |
| ✓ 17 | 16/12/2018 | Coast to Coast 70k Trail Run | 68,00 | ×1 |