Daisuke (千葉大助) Chiba
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Born : 1981
Cat. M45 Ultrarunner since 2016
12
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
31
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
Japan55,7%
Rank quotient ?This runner's calculation uses 12 eligible race(s): Σ(rank − 1) = 2 435; Σ finishers = 4 375. 2 435 / 4 375 × 100 = 55.66%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed12
Km — ultra races1 112 km
> 100 km5
Longest race138,0 km
10th SkyViewTrail Memorial Cup — 22/9/2024
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road40,5%
Trail59,5%
Records
HISTORY
12 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2025 | ||||
| 14.09 | 112.7km | 17th Shinetsu Five Mountains Trail 110km |
20:54:50 h | 174 |
| 07.06 | 100.8km | 5th Okushinano 100 |
17:58:00 h | 262 |
| 2024 | ||||
| 22.09 | 138km | 10th SkyViewTrail Memorial Cup |
32:15:53 h | 85 |
| 08.06 | 100.8km | 4th Okushinano 100 |
17:37:36 h | 231 |
| 2023 | ||||
| 17.09 | 110km | 15th Shinetsu Five Mountains Trail 110km |
21:23:50 h | 185 |
| 2022 | ||||
| 25.09 | 100km | 30. Akita Nairiku 100km Marathon |
12:36:44 h | 240 |
| 21.08 | 50km | 3rd OSJ Mahirusanchi Trail 50K |
10:23:26 h | 94 |
| 2019 | ||||
| 22.09 | 100km | 29. Akita Nairiku 100km Marathon |
12:04:49 h | 292 |
| 11.08 | 50km | 1st OSJ Mahirusanchi Trail 50K |
10:48:34 h | 154 |
| 2018 | ||||
| 23.09 | 100km | 28. Akita Nairiku 100km Marathon |
12:20:50 h | 270 |
| 2016 | ||||
| 25.09 | 100km | 26. Akita Nairiku 100km Marathon |
12:44:34 h | 385 |
| 12.06 | 50km | 12th Iwate Ginga 50km Marathon Challenge |
5:42:12 h | 75 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 22/9/2024 | 10th SkyViewTrail Memorial Cup | 138,00 | ×4 |
| ✓ 2 | 14/9/2025 | 17th Shinetsu Five Mountains Trail 110km | 112,70 | ×3 |
| ✓ 3 | 17/9/2023 | 15th Shinetsu Five Mountains Trail 110km | 110,00 | ×3 |
| ✓ 4 | 7/6/2025 | 5th Okushinano 100 | 100,80 | ×3 |
| ✓ 5 | 8/6/2024 | 4th Okushinano 100 | 100,80 | ×3 |
| ✓ 6 | 25/9/2022 | 30. Akita Nairiku 100km Marathon | 100,00 | ×3 |
| ✓ 7 | 22/9/2019 | 29. Akita Nairiku 100km Marathon | 100,00 | ×3 |
| ✓ 8 | 23/9/2018 | 28. Akita Nairiku 100km Marathon | 100,00 | ×3 |
| ✓ 9 | 25/9/2016 | 26. Akita Nairiku 100km Marathon | 100,00 | ×3 |
| ✓ 10 | 21/8/2022 | 3rd OSJ Mahirusanchi Trail 50K | 50,00 | ×1 |
| ✓ 11 | 11/8/2019 | 1st OSJ Mahirusanchi Trail 50K | 50,00 | ×1 |
| ✓ 12 | 12/6/2016 | 12th Iwate Ginga 50km Marathon Challenge | 50,00 | ×1 |