Nobuka (瀬尾暢香) Seo
ID 162605
Born : 1965 Cat. W60 Ultrarunner since 2008 JPN
32
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
2
Countries visited ?JPNJapanUSAUnited States
41,7%
Rank quotient ?This runner's calculation uses 32 eligible race(s): Σ(rank − 1) = 4 904; Σ finishers = 11 772. 4 904 / 11 772 × 100 = 41.66%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed32
Km — ultra races3 628 km
> 100 km22
> 160 km11
Longest race160,9 km
19th Run Rabbit Run 100 Mile UltraMarathon - Tortoises Run — 12/9/2025

Km per year (ultra races)

267
2 races
2022
266
2 races
2023
276
2 races
2024
262
2 races
2025
101
1 race
2026

Race types (share of distance)

Trail100,0%

Records

50 km6h07'36100 km15h06'13100 mi28h18'30

HISTORY

32 race(s)
DateRacePerf.Rk
2026
06.06 100.8km JPN6th Okushinano 100 16:39:44 h203
2025
12.09 100mi USA19th Run Rabbit Run 100 Mile UltraMarathon - Tortoises Run 34:07:22 h194
07.06 100.8km JPN5th Okushinano 100 16:12:05 h133
2024
21.09 100mi USA12th Mountain Lakes 100 28:49:45 h67
11.05 115.1km JPN2nd Aso Volcano Trail 21:20:06 h143
2023
26.08 100mi USA3rd Oregon Cascades 100 Mile Race 28:18:30 h84
13.05 105km JPN1st Aso Volcano Trail 27:22:06 h117
2022
23.09 100mi USA24th The Bear 100 Mile Endurance Run 30:37:11 h132
16.07 106.5km JPN14th OSJ Ontake 100km Ultra Trail 14:17:31 h215
2019
04.05 100km USA24th Miwok 100k Trail Race 15:06:13 h217
2018
15.09 100mi JPN10th Shinetsu Five Mountains Trail 100 mile 31:34:35 h221
21.07 100mi USA17th Tahoe Rim Trail 100M Endurance Run 32:40:47 h105
2017
16.09 102km JPN9th Shinetsu Five Mountains Trail 100 mile 18:04:32 h177
15.07 100mi USA16th Tahoe Rim Trail 100M Endurance Run 33:00:20 h121
2016
27.08 100mi USA18th Cascade Crest Classic 100 Mile 31:00:47 h80
2015
19.06 100mi USA23th Bighorn Mountain Wild & Scenic 100 Mile Trail Run 30:41:36 h105
2014
25.04 100mi JPN3rd Ultra-Trail Mt. Fuji 36:57:36 h245
2013
15.09 110km JPN5th Shinetsu Five Mountains Trail 110km 16:35:56 h100
21.07 60km JPN1st Kirishima Ebino-kougen Extreme Trail 10:12:19 h54
26.04 100mi JPN2nd Ultra-Trail Mount Fuji 38:17:08 h306
10.03 72km JPN1st Izu Trail Journey 10:46:43 h334
2012
11.11 50km JPN4th Kanna Mountain Run II 8:59:56 h45
16.09 110km JPN4th Shinetsu Five Mountains Trail 110km 17:23:05 h390
18.05 156km JPN1st Ultra-Trail Mount Fuji 42:56:35 h392
2011
02.10 50km JPN5th Madarao Forest Trails 50km 7:04:24 h147
24.09 110km JPN3rd Shinetsu Five Mountains Trail 110km 17:05:43 h103
2010
03.10 50km JPN4th Madarao Forest Trails 50km 6:37:54 h91
19.09 110km JPN2nd Shinetsu Five Mountains Trail 110km 16:37:57 h66
2009
04.10 50km JPN3rd Madarao Forest Trails 50km 6:24:39 h80
21.09 100km JPN1st Shinetsu Five Mountains Trail 100km 16:01:24 h113
28.03 50km USA4th Antelope Island Buffalo Run 50 km 6:07:36 h51
2008
05.10 50km JPN2nd Madarao Forest Trails 50km 6:43:44 h105