Toshirou (塚原俊朗) Tsukahara
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Born : 1978
Cat. M45 Ultrarunner since 2021
15
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
35
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
Japan18,0%
Rank quotient ?This runner's calculation uses 15 eligible race(s): Σ(rank − 1) = 2 116; Σ finishers = 11 779. 2 116 / 11 779 × 100 = 17.96%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed15
Km — ultra races1 455 km
> 100 km5
> 160 km3
Longest race167,0 km
10th Ultra-Trail Mt. Fuji (UTMF) — 25/4/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road19,9%
Trail80,1%
HISTORY
15 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 25.04 | 70km | 5th KAI 70k |
9:30:39 h | 54 |
| 14.03 | 90km | 16th Little Edo 90k |
9:15:44 h | 6 |
| 2025 | ||||
| 13.09 | 162.2km | 17th Shinetsu Five Mountains Trail 100 mile |
28:34:52 h | 76 |
| 25.04 | 167km | 10th Ultra-Trail Mt. Fuji |
32:11:12 h | 221 |
| 2024 | ||||
| 12.10 | 100mi | 10th OSJ Koumi 100 |
30:54:25 h | 40 |
| 06.07 | 55km | 2nd Shiga Kogen 55 |
7:28:57 h | 50 |
| 2023 | ||||
| 10.12 | 70km | 10th Izu Trail Journey |
9:13:00 h | 148 |
| 17.09 | 110km | 15th Shinetsu Five Mountains Trail 110km |
19:24:55 h | 80 |
| 16.07 | 109.2km | 15th OSJ Ontake 100km Ultra Trail |
13:46:40 h | 85 |
| 21.05 | 100km | 29th Yatsugatake Nobeyama 100 km |
11:28:36 h | 92 |
| 2022 | ||||
| 11.12 | 70km | 9th Izu Trail Journey |
10:01:09 h | 308 |
| 09.10 | 71.5km | 30th Hasetsune Cup - Japan Mountain Endurance Race |
14:45:53 h | 367 |
| 02.07 | 50km | 12th Utsukushigahara 50 km Trail Run |
7:24:42 h | 25 |
| 22.05 | 100km | 28th Yatsugatake Nobeyama 100 km |
11:37:35 h | 171 |
| 2021 | ||||
| 12.12 | 69.1km | 8th Izu Trail Journey |
10:19:03 h | 408 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 25/4/2025 | 10th Ultra-Trail Mt. Fuji (UTMF) | 167,00 | ×4 |
| ✓ 2 | 13/9/2025 | 17th Shinetsu Five Mountains Trail 100 mile | 162,20 | ×4 |
| ✓ 3 | 12/10/2024 | 10th OSJ Koumi 100 | 160,93 | ×4 |
| ✓ 4 | 17/9/2023 | 15th Shinetsu Five Mountains Trail 110km | 110,00 | ×3 |
| ✓ 5 | 16/7/2023 | 15th OSJ Ontake 100km Ultra Trail | 109,20 | ×3 |
| ✓ 6 | 21/5/2023 | 29th Yatsugatake Nobeyama 100 km | 100,00 | ×2 |
| ✓ 7 | 22/5/2022 | 28th Yatsugatake Nobeyama 100 km | 100,00 | ×2 |
| ✓ 8 | 14/3/2026 | 16th Little Edo 90k | 90,00 | ×2 |
| ✓ 9 | 9/10/2022 | 30th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 10 | 25/4/2026 | 5th KAI 70k | 70,00 | ×2 |
| ✓ 11 | 10/12/2023 | 10th Izu Trail Journey | 70,00 | ×2 |
| ✓ 12 | 11/12/2022 | 9th Izu Trail Journey | 70,00 | ×2 |
| ✓ 13 | 12/12/2021 | 8th Izu Trail Journey | 69,10 | ×1 |
| ✓ 14 | 6/7/2024 | 2nd Shiga Kogen 55 | 55,00 | ×1 |
| ✓ 15 | 2/7/2022 | 12th Utsukushigahara 50 km Trail Run | 50,00 | ×1 |