Toshiaki (入佐俊明) Irisa
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Ultrarunner since 2015
10
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
23
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
Japan63,2%
Rank quotient ?This runner's calculation uses 10 eligible race(s): Σ(rank − 1) = 3 435; Σ finishers = 5 433. 3 435 / 5 433 × 100 = 63.22%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed10
Km — ultra races700 km
Longest race100,0 km
1st Nara Ultra Marathon — 31/5/2026
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road100,0%
Records
HISTORY
10 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 31.05 | 100km | 1st Nara Ultra Marathon |
14:30:07 h | 2175 |
| 19.04 | 70km | 17th 70 km Ultra Maranic Osaka |
9:56:58 h | 194 |
| 2024 | ||||
| 20.10 | 60km | 30th River Shimanto 60km |
7:46:32 h | 227 |
| 2023 | ||||
| 15.10 | 60km | 29th River Shimanto 60km |
7:03:05 h | 119 |
| 2019 | ||||
| 20.10 | 60km | 25th River Shimanto 60km |
7:06:17 h | 151 |
| 21.04 | 70km | 11th 70 km Ultra Maranic Osaka |
8:28:08 h | 62 |
| 2018 | ||||
| 22.04 | 70km | 10th 70 km Ultra Maranic Osaka |
10:36:17 h | 212 |
| 2017 | ||||
| 23.04 | 70km | 9th 70 km Ultra Maranic Osaka |
8:17:52 h | 59 |
| 2016 | ||||
| 24.04 | 70km | 8th 70 km Ultra Maranic Osaka |
8:31:43 h | 62 |
| 2015 | ||||
| 26.04 | 70km | 7th 70 km Ultra Maranic Osaka |
9:57:46 h | 184 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 31/5/2026 | 1st Nara Ultra Marathon | 100,00 | ×4 |
| ✓ 2 | 19/4/2026 | 17th 70 km Ultra Maranic Osaka | 70,00 | ×3 |
| ✓ 3 | 21/4/2019 | 11th 70 km Ultra Maranic Osaka | 70,00 | ×3 |
| ✓ 4 | 22/4/2018 | 10th 70 km Ultra Maranic Osaka | 70,00 | ×3 |
| ✓ 5 | 23/4/2017 | 9th 70 km Ultra Maranic Osaka | 70,00 | ×3 |
| ✓ 6 | 24/4/2016 | 8th 70 km Ultra Maranic Osaka | 70,00 | ×3 |
| ✓ 7 | 26/4/2015 | 7th 70 km Ultra Maranic Osaka | 70,00 | ×3 |
| ✓ 8 | 20/10/2024 | 30th River Shimanto 60km | 60,00 | ×2 |
| ✓ 9 | 15/10/2023 | 29th River Shimanto 60km | 60,00 | ×2 |
| ✓ 10 | 20/10/2019 | 25th River Shimanto 60km | 60,00 | ×2 |