Hironari (岡本浩周) Okamoto
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Born : 1973
Cat. M50 Ultrarunner since 2013
6
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
22
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
Japan9,0%
Rank quotient ?This runner's calculation uses 6 eligible race(s): Σ(rank − 1) = 252; Σ finishers = 2 786. 252 / 2 786 × 100 = 9.05%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed6
Km — ultra races518 km
> 100 km1
Longest race110,0 km
5th Shinetsu Five Mountains Trail 110km — 15/9/2013
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Trail100,0%
Records
HISTORY
6 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 25.04 | 70km | 5th KAI 70k |
10:01:49 h | 82 |
| 2025 | ||||
| 09.11 | 70km | 10th Ryoma Dappan Trail Race |
11:57:10 h | 16 |
| 01.11 | 80km | 5th Manno Mountain Madness 2025 |
15:14:03 h | 15 |
| 2014 | ||||
| 19.07 | 100km | 7th OSJ Ontake 100km Ultra Trail |
11:33:42 h | 37 |
| 26.04 | 88km | 3rd Shizuoka to Yamanashi |
15:28:53 h | 47 |
| 2013 | ||||
| 15.09 | 110km | 5th Shinetsu Five Mountains Trail 110km |
15:26:21 h | 61 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 15/9/2013 | 5th Shinetsu Five Mountains Trail 110km | 110,00 | ×5 |
| ✓ 2 | 19/7/2014 | 7th OSJ Ontake 100km Ultra Trail | 100,00 | ×4 |
| ✓ 3 | 26/4/2014 | 3rd Shizuoka to Yamanashi (STY) | 88,00 | ×4 |
| ✓ 4 | 1/11/2025 | 5th Manno Mountain Madness 2025 | 80,00 | ×3 |
| ✓ 5 | 25/4/2026 | 5th KAI 70k | 70,00 | ×3 |
| ✓ 6 | 9/11/2025 | 10th Ryoma Dappan Trail Race | 70,00 | ×3 |