Gengo (向井源語) Mukai
Born : 1967 Cat. M55 Ultrarunner since 2012 JPN
27
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
38
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
67,7%
Rank quotient ?This runner's calculation uses 27 eligible race(s): Σ(rank − 1) = 8 142; Σ finishers = 12 034. 8 142 / 12 034 × 100 = 67.66%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed27
Km — ultra races2 085 km
> 100 km1
Longest race102,0 km

Km per year (ultra races)

2022
215
3 races
2023
100
1 race
2024
2025
46
1 race
2026

Race types (share of distance)

Road36,8%
Trail63,2%

HISTORY

27 race(s)
DateRacePerf.Rk
2026
12.04 46km JPN1st Wake Alps Trail 8:18:52 h127
2024
21.04 100km JPN3rd Suo-Oshima Ultra Marathon - 100 km 14:12:53 h167
2023
10.12 100km JPN4th Tobishima Ultra Marathon 13:41:02 h174
26.11 65km JPN1st Taishaku Gorge Marathon 8:02:49 h29
09.04 50km JPN5th Onigajo Peaks Trail 11:05:49 h87
2019
29.09 100km JPN3rd Yasaka Ultra Marathon in Hamada - 100 km 13:10:13 h28
09.06 100km JPN8th Hida Takayama 100 km Ultramarathon 13:06:13 h1231
02.06 52.7km JPN2nd Nagi Peaks Tough Trail Challenge 11:32:47 h104
25.05 50km JPN5th Mt. Hiei Int. 50 km Trail Run 10:27:48 h258
13.04 102km JPN5th Okuizumo Ultra Orochi 100km Tooashi 13:00:09 h171
07.04 70km JPN5th Okumikawa Power Trail 12:16:21 h328
13.01 100km JPN4th Yakushima Ultramarathon 14:03:38 h78
2018
09.12 100km JPN1st Tobishima Ultra Marathon 12:25:44 h57
02.12 50km JPN6th Kumano Old Trails 7:40:21 h51
28.10 66km JPN2nd Hiba Izanami Highway Run 7:13:23 h7
20.10 73km JPN9th OSJ Hyonosen Mountains Trail Race 11:54:11 h82
27.05 65km JPN3rd Osorakan-Trail 13:40:03 h172
2017
01.10 74.5km JPN2nd Shinjo-Hiruzen Super Trail 14:55:52 h226
2016
11.12 71.7km JPN3rd Izu Trail Journey 13:38:07 h1107
2015
18.10 73km JPN6th OSJ Hyonosen Mountains Trail Race 13:52:08 h375
04.07 80km JPN5th Utsukushigahara 80 km Trail Run 15:58:34 h466
2014
19.10 73km JPN5th OSJ Hyonosen Mountains Trail Race 14:27:19 h355
15.06 81.4km JPN1. Spatrail - Shima to Kusatsu 13:56:20 h382
18.05 100km JPN20th Yatsugatake Nobeyama 100 km 13:54:38 h1186
2013
20.10 71km JPN4th OSJ Hyonosen Mountains Trail Race 12:57:17 h182
13.07 100km JPN6th OSJ Ontake 100km Ultra Trail 17:17:17 h565
2012
28.10 71km JPN3rd OSJ Hyonosen Mountains Trail Race 14:57:56 h174