Masaru (小池賢) Koike
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Born : 1979
Cat. M45 Ultrarunner since 2007
6
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
20
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
Japan34,9%
Rank quotient ?This runner's calculation uses 6 eligible race(s): Σ(rank − 1) = 1 725; Σ finishers = 4 938. 1 725 / 4 938 × 100 = 34.93%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed6
Km — ultra races442 km
Longest race100,0 km
33th Fuji 4 Lakes 100 km Challenge — 16/4/2023
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road72,5%
Trail27,5%
HISTORY
6 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 19.04 | 80km | 36th Fuji 4 Lakes 80 km Challenge |
9:31:14 h | 58 |
| 2025 | ||||
| 20.04 | 62km | 35th Fuji 3 Lakes 62 km Challenge |
9:54:48 h | 637 |
| 2023 | ||||
| 11.11 | 78km | 10th Michikusa-Ultra, Minamiizu 78 km |
10:43:32 h | 48 |
| 16.04 | 100km | 33th Fuji 4 Lakes 100 km Challenge |
13:31:26 h | 877 |
| 2007 | ||||
| 14.10 | 71.5km | 15th Hasetsune Cup - Japan Mountain Endurance Race |
10:10:23 h | 51 |
| 27.05 | 50km | OSJ Hakone 50K |
8:51:51 h | 60 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 16/4/2023 | 33th Fuji 4 Lakes 100 km Challenge | 100,00 | ×5 |
| ✓ 2 | 19/4/2026 | 36th Fuji 4 Lakes 80 km Challenge | 80,00 | ×4 |
| ✓ 3 | 11/11/2023 | 10th Michikusa-Ultra, Minamiizu 78 km | 78,00 | ×3 |
| ✓ 4 | 14/10/2007 | 15th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×3 |
| ✓ 5 | 20/4/2025 | 35th Fuji 3 Lakes 62 km Challenge | 62,00 | ×3 |
| ✓ 6 | 27/5/2007 | OSJ Hakone 50K | 50,00 | ×2 |