Akira (石川晃) Ishikawa
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Born : 1972
Cat. M50 Ultrarunner since 2011
15
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
Japan18,7%
Rank quotient ?This runner's calculation uses 15 eligible race(s): Σ(rank − 1) = 1 946; Σ finishers = 10 423. 1 946 / 10 423 × 100 = 18.67%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed15
Km — ultra races1 159 km
Longest race100,0 km
25th Fuji 5 Lakes 100 km Challenge — 19/4/2015
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road25,9%
Trail74,1%
HISTORY
15 race(s)| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 19/4/2015 | 25th Fuji 5 Lakes 100 km Challenge | 100,00 | ×3 |
| ✓ 2 | 12/10/2014 | 10th Echigo Kubikino 100km Ultramarathon | 100,00 | ×3 |
| ✓ 3 | 19/5/2013 | 19th Yatsugatake Nobeyama 100 km | 100,00 | ×3 |
| ✓ 4 | 6/10/2012 | 9th Echigo Kubikino 100km Ultramarathon | 100,00 | ×3 |
| ✓ 5 | 1/7/2017 | 7th Utsukushigahara 80 km Trail Run | 80,00 | ×2 |
| ✓ 6 | 4/7/2015 | 5th Utsukushigahara 80 km Trail Run | 80,00 | ×2 |
| ✓ 7 | 6/10/2019 | 5th Gasando Trail running race | 73,00 | ×2 |
| ✓ 8 | 14/10/2018 | 4th Gasando Trail running race | 73,00 | ×2 |
| ✓ 9 | 17/5/2015 | 1st Gasando Trail running race | 73,00 | ×2 |
| ✓ 10 | 13/10/2013 | 21st Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 11 | 31/8/2013 | 3rd Utsukushigahara 70 km Trail Run | 70,00 | ×2 |
| ✓ 12 | 25/8/2012 | 2nd Utsukushigahara 70 km Trail Run | 70,00 | ×2 |
| ✓ 13 | 13/7/2013 | 4th Nozawa Onsen 4100D Mountain Trail | 65,00 | ×2 |
| ✓ 14 | 16/6/2019 | 5th Echigo Country Trail | 53,00 | ×1 |
| ✓ 15 | 2/10/2011 | 1st SkyView Ultra-Trail | 50,00 | ×1 |