Masako (今井正子) Imai
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Ultrarunner since 2006
7
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
18
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
Japan56,5%
Rank quotient ?This runner's calculation uses 7 eligible race(s): Σ(rank − 1) = 1 406; Σ finishers = 2 490. 1 406 / 2 490 × 100 = 56.47%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed7
Km — ultra races437 km
Longest race72,0 km
22nd Fuji 5 Lakes 72 km Challenge — 22/4/2012
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road83,8%
Trail16,2%
Records
HISTORY
7 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2020 | ||||
| 19.01 | 50km | 30th Miyako 50 km Ultramarathon |
6:48:11 h | 134 |
| 2017 | ||||
| 15.01 | 50km | 27th Miyako 50 km Ultramarathon |
6:22:06 h | 78 |
| 2016 | ||||
| 17.01 | 50km | 26th Miyako 50 km Ultramarathon |
6:11:08 h | 56 |
| 2012 | ||||
| 22.04 | 72km | 22nd Fuji 5 Lakes 72 km Challenge |
9:21:12 h | 322 |
| 2011 | ||||
| 30.04 | 72km | 21st Fuji 5 Lakes 72 km Challenge |
9:48:54 h | 361 |
| 2010 | ||||
| 25.04 | 72km | 20th Fuji 5 Lakes 72 km Challenge |
9:44:22 h | 292 |
| 2006 | ||||
| 21.05 | 71km | 12th Yatsugatake Nobeyama 71 km |
10:05:45 h | 170 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 22/4/2012 | 22nd Fuji 5 Lakes 72 km Challenge | 72,00 | ×4 |
| ✓ 2 | 30/4/2011 | 21st Fuji 5 Lakes 72 km Challenge | 72,00 | ×4 |
| ✓ 3 | 25/4/2010 | 20th Fuji 5 Lakes 72 km Challenge | 72,00 | ×4 |
| ✓ 4 | 21/5/2006 | 12th Yatsugatake Nobeyama 71 km | 71,00 | ×3 |
| ✓ 5 | 19/1/2020 | 30th Miyako 50 km Ultramarathon | 50,00 | ×2 |
| ✓ 6 | 15/1/2017 | 27th Miyako 50 km Ultramarathon | 50,00 | ×2 |
| ✓ 7 | 17/1/2016 | 26th Miyako 50 km Ultramarathon | 50,00 | ×2 |