Masayuki (内垣正行) Uchigaki
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Born : 1983
Cat. M40 Ultrarunner since 2017
8
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
28
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
Japan86,9%
Rank quotient ?This runner's calculation uses 8 eligible race(s): Σ(rank − 1) = 4 923; Σ finishers = 5 668. 4 923 / 5 668 × 100 = 86.86%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed8
Km — ultra races904 km
> 100 km3
> 160 km1
> 200 km1
Longest race207,0 km
5th Reiheishi Michi Kyoto to Nikko - 207 km — 29/4/2026
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road92,4%
Trail7,6%
Wins & podiums (ultra)
🏆 Win0
🏆 Win M0
🏅 Top 31
🏅 Top 3 M1
Longest winning streak0
Current streak0
Records
HISTORY
8 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 28.06 | 100km | 41. Lake Saroma 100 km Ultramarathon |
12:59:36 h | 2601 |
| 29.04 | 207km | 5th Reiheishi Michi Kyoto to Nikko - 207 km |
2d 07:55:33 h | 3 🥉 |
| 2024 | ||||
| 05.10 | 151km | 1st Noto Country Journey Run |
25:37:38 h | 106 |
| 09.03 | 115km | 14th Oedo Night run 115k |
18:32:07 h | 79 |
| 2023 | ||||
| 22.04 | 69km | 2nd KAI 69k |
16:18:43 h | 556 |
| 2022 | ||||
| 25.09 | 100km | 30. Akita Nairiku 100km Marathon |
12:53:04 h | 325 |
| 2018 | ||||
| 22.04 | 100km | 28th Fuji 5 Lakes 100 km Challenge |
13:53:14 h | 1196 |
| 2017 | ||||
| 02.07 | 62km | 1st Nikko 62km Ultramarathon |
7:04:13 h | 65 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 29/4/2026 | 5th Reiheishi Michi Kyoto to Nikko - 207 km | 207,00 | ×7 |
| ✓ 2 | 5/10/2024 | 1st Noto Country Journey Run | 151,00 | ×5 |
| ✓ 3 | 9/3/2024 | 14th Oedo Night run 115k | 115,00 | ×4 |
| ✓ 4 | 28/6/2026 | 41. Lake Saroma 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 5 | 25/9/2022 | 30. Akita Nairiku 100km Marathon | 100,00 | ×3 |
| ✓ 6 | 22/4/2018 | 28th Fuji 5 Lakes 100 km Challenge | 100,00 | ×3 |
| ✓ 7 | 22/4/2023 | 2nd KAI 69k | 69,00 | ×2 |
| ✓ 8 | 2/7/2017 | 1st Nikko 62km Ultramarathon | 62,00 | ×2 |