Kaoru (石井薫) Ishii
ID 892512
Born : 1975 Cat. M50 Ultrarunner since 2011 JPN
42
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
50
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 ?JPNJapan
50,2%
Rank quotient ?This runner's calculation uses 42 eligible race(s): Σ(rank − 1) = 13 861; Σ finishers = 27 610. 13 861 / 27 610 × 100 = 50.20%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed42
Km — ultra races2 989 km
> 100 km7
Longest race110,0 km
15th Shinetsu Five Mountains Trail 110km — 17/9/2023

Km per year (ultra races)

328
4 races
2022
367
4 races
2023
227
3 races
2024
106
2 races
2025
2026

Race types (share of distance)

Road22,3%
Trail77,7%

Records

50 km7h15'30100 km12h03'13

HISTORY

42 race(s)
DateRacePerf.Rk
2025
18.05 55.7km JPN12th Kobo Trail 2025 10:33:03 h11
15.03 50km JPN11th Mt. Hiei Int. 50 km Trail Run 8:09:01 h84
2024
03.11 68km JPN8th Koshu Alps Haute Route Challenge 13:43:44 h46
15.09 109km JPN16th Shinetsu Five Mountains Trail 110km 14:49:01 h43
11.05 50km JPN10th Mt. Hiei Int. 50 km Trail Run 8:36:53 h93
2023
18.11 106km JPN9th FunTrails100K Round 22:32:23 h94
17.09 110km JPN15th Shinetsu Five Mountains Trail 110km 21:24:44 h189
10.06 100.8km JPN3rd Okushinano 100 15:13:44 h102
13.05 50km JPN9th Mt. Hiei Int. 50 km Trail Run 8:25:16 h105
2022
06.11 68km JPN6th Koshu Alps Haute Route Challenge 12:12:50 h39
18.09 109km JPN14th Shinetsu Five Mountains Trail 110km 20:40:25 h167
11.06 100.8km JPN2nd Okushinano 100 15:25:39 h96
21.05 50km JPN8th Mt. Hiei Int. 50 km Trail Run 8:01:20 h88
2021
14.11 56km JPN6th Nikko National Park Mountain Running 6:11:27 h61
2019
15.09 110km JPN11th Shinetsu Five Mountains Trail 110km 20:38:24 h182
23.06 72.6km JPN6. Spatrail - Shima to Kusatsu 72K 11:24:50 h243
15.06 55km JPN2nd Yuzawa Sky Extreme Trail 9:42:09 h57
25.05 50km JPN5th Mt. Hiei Int. 50 km Trail Run 9:44:19 h153
2018
07.10 71.5km JPN26th Hasetsune Cup - Japan Mountain Endurance Race 16:38:43 h537
24.06 72.7km JPN5. Spatrail - Shima to Kusatsu 11:28:44 h204
12.05 50km JPN4th Mt. Hiei Int. 50 km Trail Run 8:43:08 h146
2017
12.11 50km JPN9th Kanna Mountain Run 8:11:05 h42
25.06 72.7km JPN4. Spatrail - Shima to Kusatsu 11:47:20 h399
13.05 50km JPN3rd Mt. Hiei Int. 50 km Trail Run 9:01:10 h280
2016
13.11 50km JPN8th Kanna Mountain Run 7:56:24 h25
22.10 60km JPN3rd Shigakogen Extreme Trail 9:31:25 h77
26.06 72.7km JPN3. Spatrail - Shima to Kusatsu 12:04:38 h422
12.06 45.4km JPN9th Skyline Trail Sugadaira 7:32:14 h178
28.05 50km JPN2nd Mt. Hiei Int. 50 km Trail Run 9:08:04 h434
2015
08.11 50km JPN7th Kanna Mountain Run 8:35:25 h61
13.09 53km JPN5th Hakuba Int. Trail Run 7:31:56 h184
28.06 72.7km JPN2. Spatrail - Shima to Kusatsu 12:18:51 h367
15.03 72km JPN2nd Izu Trail Journey 12:01:27 h534
2014
05.10 50km JPN8th Madarao Forest Trails 50km 7:15:30 h192
20.09 66km JPN1st SkyView Ultra-Trail 60 - Yamada Noboru Memorial Cup 12:54:06 h186
29.06 100km JPN29. Lake Saroma 100 km Ultramarathon 12:38:38 h1295
20.04 72km JPN24th Fuji 5 Lakes 72 km Challenge 9:35:53 h358
2013
30.06 100km road race JPN28. Lake Saroma 100 km Ultramarathon 12:43:18 h1750
01.06 60km JPN1st Tokyo Shibamata 60 km 7:45:51 h483
2012
05.08 77km JPN19. Ultramarathon Okumusashi 11:52:01 h1086
24.06 100km road race JPN27. Lake Saroma 100 km Ultramarathon 12:24:24 h1634
2011
26.06 100km road race JPN26. Lake Saroma 100 km Ultramarathon 12:03:13 h1176