Masaaki (臼井正昭) Usui
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Born : 1961
Cat. M65 Ultrarunner since 2009
17
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
32
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
Japan63,9%
Rank quotient ?This runner's calculation uses 17 eligible race(s): Σ(rank − 1) = 6 428; Σ finishers = 10 067. 6 428 / 10 067 × 100 = 63.85%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed17
Km — ultra races1 291 km
> 100 km1
Longest race156,0 km
1st Ultra-Trail Mount Fuji (UTMF) — 18/5/2012
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road15,5%
Trail84,5%
Records
HISTORY
17 race(s)| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 18/5/2012 | 1st Ultra-Trail Mount Fuji (UTMF) | 156,00 | ×4 |
| ✓ 2 | 22/5/2016 | 22nd Yatsugatake Nobeyama 100 km | 100,00 | ×3 |
| ✓ 3 | 17/5/2015 | 21st Yatsugatake Nobeyama 100 km | 100,00 | ×3 |
| ✓ 4 | 19/5/2013 | 19th Yatsugatake Nobeyama 100 km | 100,00 | ×3 |
| ✓ 5 | 6/10/2012 | 9th Echigo Kubikino 100km Ultramarathon | 100,00 | ×3 |
| ✓ 6 | 9/10/2010 | 8th Echigo Kubikino 100km Ultramarathon | 100,00 | ×3 |
| ✓ 7 | 13/7/2019 | 10th Nozawa Onsen 4100D Mountain Trail | 65,00 | ×2 |
| ✓ 8 | 14/7/2018 | 9th Nozawa Onsen 4100D Mountain Trail | 65,00 | ×2 |
| ✓ 9 | 16/7/2016 | 7th Nozawa Onsen 4100D Mountain Trail | 65,00 | ×2 |
| ✓ 10 | 19/7/2015 | 6th Nozawa Onsen 4100D Mountain Trail | 65,00 | ×2 |
| ✓ 11 | 20/7/2014 | 5th Nozawa Onsen 4100D Mountain Trail | 65,00 | ×2 |
| ✓ 12 | 13/7/2013 | 4th Nozawa Onsen 4100D Mountain Trail | 65,00 | ×2 |
| ✓ 13 | 9/11/2014 | 6th Kanna Mountain Run | 50,00 | ×1 |
| ✓ 14 | 6/11/2011 | 3th Kanna Mountain Run | 50,00 | ×1 |
| ✓ 15 | 4/7/2010 | 2nd OSJ Shiga Kogen Trail 50K | 50,00 | ×1 |
| ✓ 16 | 5/7/2009 | 1st OSJ Shiga Kogen Trail 50K | 50,00 | ×1 |
| ✓ 17 | 31/10/2010 | 2nd Shinshu-Togakushi Trail Run Race | 45,00 | ×1 |