Tatsuya (前原達哉) Maehara
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Born : 1985
Cat. M40 Ultrarunner since 2022
8
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
28
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
Japan66,9%
Rank quotient ?This runner's calculation uses 8 eligible race(s): Σ(rank − 1) = 1 927; Σ finishers = 2 880. 1 927 / 2 880 × 100 = 66.91%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed8
Km — ultra races903 km
> 100 km4
> 160 km2
Longest race167,0 km
9th Ultra-Trail Mt. Fuji (UTMF) — 26/4/2024
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road33,2%
Trail66,8%
Records
HISTORY
8 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 13.06 | 100mi | 5th Kuman 100 |
34:20:00 h | 22 |
| 09.05 | 114km | 4th Aso Volcano Trail |
21:20:24 h | 138 |
| 2025 | ||||
| 15.11 | 101km | 4th Kumagawa Revival Trail |
23:34:03 h | 70 |
| 05.10 | 100km | 6th Mine Akiyoshidai Geopark Ultra Marathon |
12:37:20 h | 29 |
| 2024 | ||||
| 06.10 | 100km | 5th Mine Akiyoshidai Geopark Ultra Marathon |
12:44:09 h | 45 |
| 26.04 | 167km | 9th Ultra-Trail Mt. Fuji |
43:41:38 h | 1117 |
| 2023 | ||||
| 08.07 | 100km | 1st Shiga Kogen 100 |
25:11:35 h | 307 |
| 2022 | ||||
| 24.07 | 60km | 10th Kirishima Ebino-kougen Extreme Trail |
11:57:13 h | 207 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 26/4/2024 | 9th Ultra-Trail Mt. Fuji (UTMF) | 167,00 | ×5 |
| ✓ 2 | 13/6/2026 | 5th Kuman 100 | 160,93 | ×5 |
| ✓ 3 | 9/5/2026 | 4th Aso Volcano Trail | 114,00 | ×4 |
| ✓ 4 | 15/11/2025 | 4th Kumagawa Revival Trail | 101,00 | ×3 |
| ✓ 5 | 5/10/2025 | 6th Mine Akiyoshidai Geopark Ultra Marathon | 100,00 | ×3 |
| ✓ 6 | 6/10/2024 | 5th Mine Akiyoshidai Geopark Ultra Marathon | 100,00 | ×3 |
| ✓ 7 | 8/7/2023 | 1st Shiga Kogen 100 | 100,00 | ×3 |
| ✓ 8 | 24/7/2022 | 10th Kirishima Ebino-kougen Extreme Trail | 60,00 | ×2 |