Osamu (一松収) Ichimatsu
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Ultrarunner since 2020
8
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
24
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
Japan37,1%
Rank quotient ?This runner's calculation uses 8 eligible race(s): Σ(rank − 1) = 1 777; Σ finishers = 4 784. 1 777 / 4 784 × 100 = 37.14%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed8
Km — ultra races660 km
Longest race100,0 km
33. Akita Nairiku 100km Marathon — 28/9/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road100,0%
Records
HISTORY
8 race(s)| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 28/9/2025 | 33. Akita Nairiku 100km Marathon | 100,00 | ×4 |
| ✓ 2 | 13/10/2024 | 15th Echigo Kubikino 100km Ultramarathon | 100,00 | ×4 |
| ✓ 3 | 25/6/2023 | 38. Lake Saroma 100 km Ultramarathon | 100,00 | ×4 |
| ✓ 4 | 9/10/2022 | 14th Echigo Kubikino 100km Ultramarathon | 100,00 | ×4 |
| ✓ 5 | 4/7/2021 | 27th 8-Hour Endurance Race Tokorozawa | 73,50 | ×3 |
| ✓ 6 | 3/10/2021 | 8th Naeba-Sanroku Geopark Tsunan Ultramarathon 64K | 64,00 | ×2 |
| ✓ 7 | 4/10/2020 | 7th Naeba-Sanroku Geopark Tsunan Ultramarathon 64K | 64,00 | ×2 |
| ✓ 8 | 3/7/2022 | 28th 8-Hour Endurance Race Tokorozawa | 58,80 | ×2 |