Naotaka (西川尚孝) Nishikawa
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Born : 1974
Cat. M50 Ultrarunner since 2015
16
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
37
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
Japan32,9%
Rank quotient ?This runner's calculation uses 16 eligible race(s): Σ(rank − 1) = 1 719; Σ finishers = 5 222. 1 719 / 5 222 × 100 = 32.92%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed16
Km — ultra races1 777 km
> 100 km9
> 160 km5
Longest race170,0 km
4th Tamba 100 Adventure Trail - 100mi — 6/6/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Trail100,0%
Records
HISTORY
16 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2025 | ||||
| 15.11 | 167km | 4th Kumagawa Revival Trail |
33:33:19 h | 23 |
| 06.06 | 170km | 4th Tamba 100 Adventure Trail - 100mi |
2d 08:29:30 h | 23 |
| 2024 | ||||
| 18.05 | 100mi | 9th Trainic World 100 Mile in Sai-No-Kuni |
34:38:30 h | 69 |
| 2023 | ||||
| 06.10 | 169km | 3rd Lake Biwa 100 |
45:59:17 h | 156 |
| 03.09 | 64km | 6th Mizukami Mountain Party |
10:26:22 h | 20 |
| 21.04 | 167km | 8th Ultra-Trail Mt. Fuji |
35:06:52 h | 493 |
| 2022 | ||||
| 05.11 | 100km | 2nd OSJ Kami 100 |
21:41:36 h | 69 |
| 21.05 | 109.2km | 7th Trainic World 100 km in Sai-No-Kuni |
22:24:33 h | 36 |
| 2021 | ||||
| 24.10 | 66km | 6th Osorakan-Trail 66 km |
11:01:12 h | 10 |
| 2019 | ||||
| 11.05 | 121km | 3rd Aso Round Trail |
24:55:06 h | 96 |
| 2018 | ||||
| 21.07 | 67.5km | 6th Kirishima Ebino-kougen Extreme Trail |
11:26:22 h | 139 |
| 12.05 | 108.7km | 2nd Aso Round Trail |
22:32:29 h | 112 |
| 2017 | ||||
| 23.07 | 67.5km | 5th Kirishima Ebino-kougen Extreme Trail |
11:56:15 h | 174 |
| 13.05 | 108.7km | 1st Aso Round Trail |
25:46:53 h | 111 |
| 2016 | ||||
| 24.07 | 67.5km | 4th Kirishima Ebino-kougen Extreme Trail |
10:05:38 h | 64 |
| 2015 | ||||
| 21.07 | 63km | 3rd Kirishima Ebino-kougen Extreme Trail |
11:38:07 h | 140 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 6/6/2025 | 4th Tamba 100 Adventure Trail - 100mi | 170,00 | ×4 |
| ✓ 2 | 6/10/2023 | 3rd Lake Biwa 100 | 169,00 | ×4 |
| ✓ 3 | 15/11/2025 | 4th Kumagawa Revival Trail | 167,00 | ×4 |
| ✓ 4 | 21/4/2023 | 8th Ultra-Trail Mt. Fuji (UTMF) | 167,00 | ×4 |
| ✓ 5 | 18/5/2024 | 9th Trainic World 100 Mile in Sai-No-Kuni | 160,93 | ×4 |
| ✓ 6 | 11/5/2019 | 3rd Aso Round Trail | 121,00 | ×3 |
| ✓ 7 | 21/5/2022 | 7th Trainic World 100 km in Sai-No-Kuni | 109,20 | ×2 |
| ✓ 8 | 12/5/2018 | 2nd Aso Round Trail | 108,70 | ×2 |
| ✓ 9 | 13/5/2017 | 1st Aso Round Trail | 108,70 | ×2 |
| ✓ 10 | 5/11/2022 | 2nd OSJ Kami 100 | 100,00 | ×2 |
| ✓ 11 | 21/7/2018 | 6th Kirishima Ebino-kougen Extreme Trail | 67,50 | ×1 |
| ✓ 12 | 23/7/2017 | 5th Kirishima Ebino-kougen Extreme Trail | 67,50 | ×1 |
| ✓ 13 | 24/7/2016 | 4th Kirishima Ebino-kougen Extreme Trail | 67,50 | ×1 |
| ✓ 14 | 24/10/2021 | 6th Osorakan-Trail 66 km | 66,00 | ×1 |
| ✓ 15 | 3/9/2023 | 6th Mizukami Mountain Party | 64,00 | ×1 |
| ✓ 16 | 21/7/2015 | 3rd Kirishima Ebino-kougen Extreme Trail | 63,00 | ×1 |