Hideaki (古川英明) Furukawa
Born : 1974 Cat. M50 Ultrarunner since 2013 JPN
38
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
53
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
5
Countries visited ?FRAFranceITAItalyJPNJapanTPETaiwanUSAUnited States
39,3%
Rank quotient ?This runner's calculation uses 38 eligible race(s): Σ(rank − 1) = 9 106; Σ finishers = 23 167. 9 106 / 23 167 × 100 = 39.31%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed38
Km — ultra races3 628 km
> 100 km17
> 160 km5
Longest race170,0 km

Km per year (ultra races)

568
5 races
2022
421
3 races
2023
388
3 races
2024
158
2 races
2025
263
3 races
2026

Race types (share of distance)

Road16,0%
Trail84,0%

HISTORY

38 race(s)
DateRacePerf.Rk
2026
27.06 100mi USA53rd Western States 100 Mile Endurance Run 29:41:09 h306
28.03 50km JPN34th Mt. Rocco Cannonball Run - 50km Night Speed 8:21:25 h10
07.03 52km TPE1st Xtrail Kenting by UTMB - Xtrail 50K 7:45:03 h187
2025
20.07 99.5km JPN17th OSJ Ontake 100km Ultra Trail 16:46:09 h630
21.06 58km JPN1st Kaga Spa by UTMB - Kaga Spa Trail Endurance 50 11:03:52 h258
2024
14.07 109.2km JPN16th OSJ Ontake 100km Ultra Trail 15:50:14 h428
26.04 167km JPN9th Ultra-Trail Mt. Fuji 38:38:48 h627
30.03 112km JPN30th Mt. Rocco Cannonball Run - 112 km Power 15:51:11 h12
2023
29.08 145km ITA13ème Sur les Traces des Ducs de Savoie 39:25:01 h648
16.07 109.2km JPN15th OSJ Ontake 100km Ultra Trail 17:13:36 h331
21.04 167km JPN8th Ultra-Trail Mt. Fuji 38:18:44 h767
2022
11.12 70km JPN9th Izu Trail Journey 10:32:09 h417
28.10 112km JPN27th Mt. Rocco Cannonball Run - 112 km Power 17:39:53 h19
16.07 106.5km JPN14th OSJ Ontake 100km Ultra Trail 15:36:29 h339
22.04 167km JPN7th Ultra-Trail Mt. Fuji 38:52:37 h935
19.03 112km JPN26th Mt. Rocco Cannonball Run - 112 km Power 17:36:00 h28
2021
16.10 56km JPN25th Mt. Rocco Cannonball Run - 56 km Speed 7:27:49 h63
2020
21.03 112km JPN22th Mt. Rocco Cannonball Run - 112 km Power 15:30:00 h9
2019
27.10 73km JPN10th OSJ Hyonosen Mountains Trail Race 11:53:52 h50
19.10 56km JPN21th Mt. Rocco Cannonball Run - 56 km Night Speed 8:13:00 h5
11.05 121km JPN3rd Aso Round Trail 26:06:50 h134
2018
24.03 112km JPN18th Mt. Rocco Cannonball Run - 112 km Power 17:52:46 h42
2017
16.09 102km JPN9th Shinetsu Five Mountains Trail 100 mile 17:16:58 h132
15.07 100km JPN10th OSJ Ontake 100km Ultra Trail 13:09:15 h131
2016
23.10 56km JPN15th Mt. Rocco Cannonball Run - 56 km Speed 7:20:44 h49
26.08 170km FRA14ème Ultra Trail Tour du Mont Blanc 42:42:39 h882
16.07 100km JPN9th OSJ Ontake 100km Ultra Trail 12:59:41 h155
28.05 50km JPN2nd Mt. Hiei Int. 50 km Trail Run 8:02:47 h174
27.03 56km JPN14th Mt. Rocco Cannonball Run - 56 km Speed 6:15:52 h25
2015
18.10 56km JPN13th Mt. Rocco Cannonball Run - 56 km Speed 7:08:07 h33
18.07 100km JPN8th OSJ Ontake 100km Ultra Trail 14:29:32 h261
30.05 50km JPN1st Mt. Hiei Int. 50 km Trail Run 8:53:46 h139
12.04 63km JPN1st Okumikawa Power Trail 11:51:36 h208
29.03 56km JPN12th Mt. Rocco Cannonball Run - 56 km Speed 6:27:27 h27
2014
14.09 110km JPN6th Shinetsu Five Mountains Trail 110km 18:57:27 h235
19.07 100km JPN7th OSJ Ontake 100km Ultra Trail 14:27:10 h264
30.03 56km JPN10th Mt. Rocco Cannonball Run - 56 km Speed 6:40:35 h26
2013
19.05 76km JPNSaba Highway Ultramarathon 9:55:50 h158