Kenichi (手塚健一) Tezuka
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Ultrarunner since 2006
7
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
25
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
Japan70,3%
Rank quotient ?This runner's calculation uses 7 eligible race(s): Σ(rank − 1) = 1 230; Σ finishers = 1 750. 1 230 / 1 750 × 100 = 70.29%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed7
Km — ultra races687 km
> 100 km5
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)
Road22,6%
Trail14,8%
Ult.Walk62,6%
Records
HISTORY
7 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 21.02 | 105km | 1st Lake Hamana and the Enshu Tokaido Ultra |
25:05:10 h | 162 |
| 10.01 | 102km | 3rd Nara Mahoroba Ultra Walking |
26:17:33 h | 280 |
| 2025 | ||||
| 23.08 | 100km | 1st Summer Karuizawa and Joshu Nakasendo Ultra Walking |
27:12:46 h | 122 |
| 19.07 | 102km | 2nd Shinshu Nakasendo 12 Stations Ultra Race |
26:28:54 h | 125 |
| 2024 | ||||
| 23.11 | 103km | 3rd Kyoto Ultra Walking 110km |
23:52:22 h | 128 |
| 2023 | ||||
| 10.06 | 125km | 7th Fujisan Issyu Walking |
29:30:46 h | 177 |
| 2006 | ||||
| 25.06 | 50km | 21. Lake Saroma 50 km Ultramarathon |
6:58:02 h | 243 |
| 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 | 21/2/2026 | 1st Lake Hamana and the Enshu Tokaido Ultra | 105,00 | ×4 |
| ✓ 3 | 23/11/2024 | 3rd Kyoto Ultra Walking 110km | 103,00 | ×4 |
| ✓ 4 | 10/1/2026 | 3rd Nara Mahoroba Ultra Walking | 102,00 | ×4 |
| ✓ 5 | 19/7/2025 | 2nd Shinshu Nakasendo 12 Stations Ultra Race | 102,00 | ×4 |
| ✓ 6 | 23/8/2025 | 1st Summer Karuizawa and Joshu Nakasendo Ultra Walking | 100,00 | ×4 |
| ✓ 7 | 25/6/2006 | 21. Lake Saroma 50 km Ultramarathon | 50,00 | ×2 |