Koichi (山形浩一) Yamagata
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Ultrarunner since 2017
7
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
26
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
Japan49,3%
Rank quotient ?This runner's calculation uses 7 eligible race(s): Σ(rank − 1) = 1 284; Σ finishers = 2 607. 1 284 / 2 607 × 100 = 49.25%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed7
Km — ultra races812 km
> 100 km2
> 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)
Road47,7%
Trail36,9%
Ult.Walk15,4%
Records
HISTORY
7 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2025 | ||||
| 24.05 | 100km | 7th Tsukuba Rinrin Road 100km |
22:56:59 h | 183 |
| 10.05 | 225km | 14th Gunma 100km Walk |
19:55:02 h | 89 |
| 2024 | ||||
| 25.05 | 100km | 6th Tsukuba Rinrin Road 100km |
17:58:00 h | 57 |
| 2023 | ||||
| 10.06 | 125km | 7th Fujisan Issyu Walking |
24:49:46 h | 60 |
| 2022 | ||||
| 28.05 | 100km | 4th Tsukuba Rinrin Road 100km |
19:21:00 h | 53 |
| 2018 | ||||
| 17.06 | 100km | 2nd Nikko 100km Ultramarathon |
12:44:13 h | 437 |
| 2017 | ||||
| 02.07 | 62km | 1st Nikko 62km Ultramarathon |
9:14:09 h | 412 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 10/5/2025 | 14th Gunma 100km Walk | 225,00 | ×8 |
| ✓ 2 | 10/6/2023 | 7th Fujisan Issyu Walking | 125,00 | ×4 |
| ✓ 3 | 24/5/2025 | 7th Tsukuba Rinrin Road 100km | 100,00 | ×3 |
| ✓ 4 | 25/5/2024 | 6th Tsukuba Rinrin Road 100km | 100,00 | ×3 |
| ✓ 5 | 28/5/2022 | 4th Tsukuba Rinrin Road 100km | 100,00 | ×3 |
| ✓ 6 | 17/6/2018 | 2nd Nikko 100km Ultramarathon | 100,00 | ×3 |
| ✓ 7 | 2/7/2017 | 1st Nikko 62km Ultramarathon | 62,00 | ×2 |