Hiroshi (熊崎浩志) Kumazaki
ID 441763
Born : 1975 Cat. M50 Ultrarunner since 2013 JPN
51
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
57
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
2
Countries visited ?JPNJapanTHAThailand
24,0%
Rank quotient ?This runner's calculation uses 52 eligible race(s): Σ(rank − 1) = 10 051; Σ finishers = 41 920. 10 051 / 41 920 × 100 = 23.98%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed52
Km — ultra races5 221 km
> 100 km15
> 160 km11
Longest race169,0 km
5th Lake Biwa 100 — 10/10/2025

Km per year (ultra races)

398
3 races
2022
1 027
9 races
2023
675
5 races
2024
725
6 races
2025
367
3 races
2026

Race types (share of distance)

Road28,4%
Trail71,6%

Wins & podiums (ultra)

🏆 Win0
🏆 Win M0
🏅 Top 31
🏅 Top 3 M1
Longest winning streak0
Current streak0

Records

50 km7h40'01100 km7h43'0750 mi10h43'10100 mi19h16'5912 h72,00 km

HISTORY

52 race(s)
DateRacePerf.Rk
2026
28.06 100km JPN41. Lake Saroma 100 km Ultramarathon 7:43:07 h49
14.06 100km JPN14th Hida Takayama 100 km Ultramarathon 9:13:18 h45
24.04 167km JPN11th Ultra-Trail Mt. Fuji 28:49:02 h111
2025
05.12 90km THA2nd Chiangmai Thailand by UTMB - ELEPHANT 100 15:44:59 h111
10.10 169km JPN5th Lake Biwa 100 36:11:01 h43
21.06 105km JPN1st Kaga Spa by UTMB - Kaga Spa Trail Endurance100 17:10:58 h25
08.06 100km JPN13th Hida Takayama 100 km Ultramarathon 8:16:27 h8
03.05 100mi JPN5th Yarikan 100 34:29:37 h50
13.04 100km JPN4th Atsumi Peninsula Ultra Nature Run - 100km 9:41:59 h3 🥉
2024
11.10 169km JPN4th Lake Biwa 100 40:33:47 h68
13.07 100mi JPN16th OSJ Ontake 100 Mile Ultra Trail 19:16:59 h13
21.06 165km JPN3rd Deep Japan Ultra 100 - 165 km 34:07:33 h10
09.06 100km JPN12th Hida Takayama 100 km Ultramarathon 8:41:51 h16
11.05 50mi JPN10th Mt. Hiei Int. 50 Mile Trail Run 10:43:10 h14
2023
10.12 70km JPN10th Izu Trail Journey 8:50:54 h101
06.10 169km JPN3rd Lake Biwa 100 40:54:13 h103
16.09 162.6km JPN15th Shinetsu Five Mountains Trail 100 mile 30:41:24 h113
16.07 109.2km JPN15th OSJ Ontake 100km Ultra Trail 12:05:37 h19
11.06 100km JPN11th Hida Takayama 100 km Ultramarathon 9:58:33 h104
21.05 77km JPN28th Saba Highway Ultramarathon 7:14:26 h4
30.04 12h JPN3rd Yarikan 12h 72.000 km5
21.04 167km JPN8th Ultra-Trail Mt. Fuji 29:24:31 h153
04.03 100km JPN1st Minonokuni Yamajiro Trail 100 21:50:00 h8
2022
08.10 100mi JPN8th OSJ Koumi 100 32:13:15 h26
22.04 167km JPN7th Ultra-Trail Mt. Fuji 24:54:43 h70
10.04 70km JPN7th Okumikawa Power Trail 9:52:53 h38
2021
12.12 69.1km JPN8th Izu Trail Journey 8:19:01 h68
2020
13.12 66km JPN7th Izu Trail Journey 7:52:37 h62
18.10 54km JPN7th Shigakogen Extreme Trail 8:06:50 h59
2019
15.09 110km JPN11th Shinetsu Five Mountains Trail 110km 17:17:11 h54
09.06 100km JPN8th Hida Takayama 100 km Ultramarathon 10:23:56 h203
07.04 70km JPN5th Okumikawa Power Trail 10:28:00 h97
2018
09.12 71.7km JPN5th Izu Trail Journey 9:55:47 h192
14.10 73km JPN4th Gasando Trail running race 10:59:45 h82
09.09 51.4km JPN8th Hakuba Int. Trail Run 6:48:05 h86
30.06 80km JPN8th Utsukushigahara 80 km Trail Run 13:56:06 h125
10.06 100km JPN7th Hida Takayama 100 km Ultramarathon 12:18:11 h593
22.04 70km JPN4th Okumikawa Power Trail 12:46:27 h222
2017
10.09 51.4km JPN7th Hakuba Int. Trail Run 7:06:34 h186
11.06 100km JPN6th Hida Takayama 100 km Ultramarathon 11:49:22 h511
2016
11.09 53km JPN6th Hakuba Int. Trail Run 7:14:20 h94
02.07 80km JPN6th Utsukushigahara 80 km Trail Run 14:37:03 h323
12.06 100km JPN5th Hida Takayama 100 km Ultramarathon 11:57:19 h434
24.04 70km JPN2nd Okumikawa Power Trail 11:54:29 h297
2015
29.11 50km JPNKumano Old Trails 7:40:01 h38
26.09 76.7km JPN4th Shizuoka to Yamanashi 15:01:41 h198
07.06 100km JPN4th Hida Takayama 100 km Ultramarathon 13:15:29 h767
19.04 100km JPN25th Fuji 5 Lakes 100 km Challenge 13:38:42 h1119
2014
12.10 71.5km JPN22nd Hasetsune Cup - Japan Mountain Endurance Race 17:37:22 h1324
20.04 108km JPN24th Fuji 5 Lakes 108 km Challenge 14:17:48 h582
2013
15.09 53km JPN3rd Hakuba Int. Trail Run 8:45:50 h385
09.06 100km JPN2nd Hida Takayama 100 km Ultramarathon 13:33:50 h692