Kenichiro (中西健一郎) Nakanishi
ID 426009
Born : 1976 Cat. M50 Ultrarunner since 2013 JPN
31
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
1
Countries visited ?JPNJapan
25,1%
Rank quotient ?This runner's calculation uses 31 eligible race(s): Σ(rank − 1) = 4 674; Σ finishers = 18 641. 4 674 / 18 641 × 100 = 25.07%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed31
Km — ultra races3 360 km
> 100 km13
> 160 km10
> 200 km1
Longest race300,0 km
4th Round of the Boso Peninsula 300K — 18/7/2026

Km per year (ultra races)

500
4 races
2022
324
2 races
2023
228
2 races
2024
210
2 races
2025
461
2 races
2026

Race types (share of distance)

Road20,8%
Trail79,2%

Records

100 km11h53'37100 mi23h31'10

HISTORY

31 race(s)
DateRacePerf.Rk
2026
18.07 300km JPN4th Round of the Boso Peninsula 300K 2d 06:38:19 h14
16.05 100mi JPN11th Trainic World 100 Mile in Sai-No-Kuni 34:13:45 h64
2025
13.09 162.2km JPN17th Shinetsu Five Mountains Trail 100 mile 30:12:34 h117
14.06 48km JPN4th KTF Trail running race - Rockin Bear 5:20:35 h46
2024
14.09 163.1km JPN16th Shinetsu Five Mountains Trail 100 mile 25:36:33 h57
14.07 65km JPN15th Nozawa Onsen 4100D Mountain Trail 9:26:42 h29
2023
16.09 162.6km JPN15th Shinetsu Five Mountains Trail 100 mile 29:43:49 h84
15.07 100mi JPN15th OSJ Ontake 100 Mile Ultra Trail 23:31:10 h39
2022
11.12 70km JPN9th Izu Trail Journey 9:04:58 h131
17.09 162.6km JPN14th Shinetsu Five Mountains Trail 100 mile 30:08:18 h89
16.07 106.5km JPN14th OSJ Ontake 100km Ultra Trail 13:48:37 h169
21.05 100mi JPN7th Trainic World 100 Mile in Sai-No-Kuni 33:18:40 h55
2021
12.12 69.1km JPN8th Izu Trail Journey 8:50:04 h139
28.08 75km JPN1st Okushinano 100 - 75 km 11:33:54 h63
23.07 65km JPN12th Nozawa Onsen 4100D Mountain Trail 9:05:20 h55
2019
08.12 71.7km JPN6th Izu Trail Journey 9:06:08 h197
14.09 100mi JPN11th Shinetsu Five Mountains Trail 100 mile 29:46:48 h133
2018
09.12 71.7km JPN5th Izu Trail Journey 9:54:16 h190
06.10 100mi JPN5th OSJ Koumi 100 33:34:42 h51
09.09 51.4km JPN8th Hakuba Int. Trail Run 6:15:19 h44
19.05 106km JPN3rd Trainic World 100 km in Sai-No-Kuni 23:02:54 h51
2017
10.12 71.7km JPN4th Izu Trail Journey 10:34:38 h249
10.09 51.4km JPN7th Hakuba Int. Trail Run 6:32:18 h97
20.05 106km JPN2nd Trainic World 100 km in Sai-No-Kuni 25:17:33 h59
2016
16.12 70km JPNCoast to Coast 70k Trail Run 8:36:45 h83
11.09 53km JPN6th Hakuba Int. Trail Run 6:57:36 h77
05.06 100km JPN4th Tokyo Shibamata 100 km 11:53:37 h462
2015
13.09 53km JPN5th Hakuba Int. Trail Run 7:04:47 h126
06.06 100km JPN3rd Tokyo Shibamata 100 km 12:16:31 h603
2014
01.06 100km JPN2nd Tokyo Shibamata 100 km 12:47:55 h260
2013
01.06 100km JPN1st Tokyo Shibamata 100 km 13:16:31 h872