Masayoshi (石川全良) Ishikawa
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Ultrarunner since 2021
6
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
Japan66,9%
Rank quotient ?This runner's calculation uses 6 eligible race(s): Σ(rank − 1) = 711; Σ finishers = 1 062. 711 / 1 062 × 100 = 66.95%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed6
Km — ultra races612 km
> 100 km3
Longest race125,0 km
7th Fujisan Issyu Walking — 10/6/2023
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road9,8%
Ult.Walk90,2%
Records
HISTORY
6 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 28.03 | 100km | 2nd Tokyo Story Ultra Walking |
27:31:39 h | 226 |
| 2025 | ||||
| 22.03 | 100km | 1st Tokyo Story Ultra Walking |
23:48:12 h | 117 |
| 2024 | ||||
| 26.10 | 60km | 6th Tsurugashima 60km |
11:57:07 h | 10 |
| 27.04 | 102km | 3rd Miura-Halbinsel-Tour Ultra Walking |
22:01:42 h | 95 |
| 2023 | ||||
| 10.06 | 125km | 7th Fujisan Issyu Walking |
29:14:00 h | 168 |
| 2021 | ||||
| 12.06 | 125km | 5th Fujisan Issyu Walking |
27:35:26 h | 101 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 10/6/2023 | 7th Fujisan Issyu Walking | 125,00 | ×5 |
| ✓ 2 | 12/6/2021 | 5th Fujisan Issyu Walking | 125,00 | ×5 |
| ✓ 3 | 27/4/2024 | 3rd Miura-Halbinsel-Tour Ultra Walking | 102,00 | ×4 |
| ✓ 4 | 28/3/2026 | 2nd Tokyo Story Ultra Walking | 100,00 | ×4 |
| ✓ 5 | 22/3/2025 | 1st Tokyo Story Ultra Walking | 100,00 | ×4 |
| ✓ 6 | 26/10/2024 | 6th Tsurugashima 60km | 60,00 | ×2 |