Manabu (山本学) Yamamoto
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Ultrarunner since 2012
7
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
21
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
Japan43,9%
Rank quotient ?This runner's calculation uses 7 eligible race(s): Σ(rank − 1) = 2 588; Σ finishers = 5 898. 2 588 / 5 898 × 100 = 43.88%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed7
Km — ultra races521 km
Longest race100,0 km
1st Nara Ultra Marathon — 31/5/2026
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road66,2%
Trail33,8%
Records
HISTORY
7 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 31.05 | 100km | 1st Nara Ultra Marathon |
13:15:39 h | 1188 |
| 25.04 | 70km | 5th KAI 70k |
16:34:47 h | 713 |
| 2025 | ||||
| 02.08 | 50km | 6th Osaka Natsunojin Kurondo Rondo - 50 km |
12:48:02 h | 19 |
| 20.04 | 100km | 35th Fuji 4 Lakes 100 km Challenge |
12:22:26 h | 607 |
| 2024 | ||||
| 19.10 | 56km | 31th Mt. Rocco Cannonball Run - 56 km Night Speed |
8:25:00 h | 11 |
| 2015 | ||||
| 25.10 | 45km | 2nd Laguna Beach Ultra Marathon - 45km |
3:48:39 h | 4 |
| 2012 | ||||
| 21.10 | 100km | 18th River Shimanto 100km |
9:22:42 h | 53 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 31/5/2026 | 1st Nara Ultra Marathon | 100,00 | ×4 |
| ✓ 2 | 20/4/2025 | 35th Fuji 4 Lakes 100 km Challenge | 100,00 | ×4 |
| ✓ 3 | 21/10/2012 | 18th River Shimanto 100km | 100,00 | ×4 |
| ✓ 4 | 25/4/2026 | 5th KAI 70k | 70,00 | ×3 |
| ✓ 5 | 19/10/2024 | 31th Mt. Rocco Cannonball Run - 56 km Night Speed | 56,00 | ×2 |
| ✓ 6 | 2/8/2025 | 6th Osaka Natsunojin Kurondo Rondo - 50 km | 50,00 | ×2 |
| ✓ 7 | 25/10/2015 | 2nd Laguna Beach Ultra Marathon - 45km | 45,00 | ×2 |